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58 items tagged "communication"
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21:32
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SecDocs
Authors:
Herr Urbach Tags:
privacy obfuscation Event:
Chaos Communication Camp 2011 Abstract: In January 2011 the fear of all internauts became bitter truth. A whole country was kill-switched by the government. The flow of data was interrupted, communication laid waste. Not only the Internets was taken down, other means of communication were interrupted too. Cell Phone providers took down their services. So, there was no Internets in Egypt. Internauts had no chance to communicate what is happening, mothers and fathers could not send emails to theire relatives. No data was flowing. As the phone lines were working, this was the solutions: Modems. In this talk I will describe what Telecomix agents had done during these days to bring back internet to the people of egypt. We used modem technology and set up dial up points all over the world and convinced providers with modem pools to open theire pools for the egyptians for free. Another thing we did was communication via HAM radio and of course fax. Not like anonymous who like to fax cables and stuff, but helpful information about medical help, how to communicate on a secure base and things like that. Furthermore I will describe the structure of Telecomix who are working as a decentralized cluster.
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16:35
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SecDocs
Tags:
smart card phone Event:
Chaos Communication Camp 2011 Abstract: This talk sheds some light on a cellphone-component, that's inevitable, virtually unclonable and as closed as it gets: the SIM. The SIM can do a lot more than just user-authentication nowadays: the SIM Application Toolkit gives it control over your phone Recently, location tracking in major smartphones caused quite a stir. Closed systems make discovering such unwanted behavior more difficult. While projects like osmocomBB aim at creating an open cellphone architecture, the SIM seems to be mostly inconsiderable and harmless. It's little known, that the SIM Application Toolkit (SAT) gives the SIM extensive control over the phone. Via the SAT, the SIM can obtain location information, monitor and redirect calls and send/receive short messages, as well as IP packets. The SIM-firmware can be updated over-the-air. Most of these features can even be used without the user noticing. Along with the mentioned SAT, this talk will illuminate the classic GSM SIM, as well as the 3G USIM altogether. After a quick introduction to smartcards in general, communication with the SIM will be explained in more detail. The most important SIM commands and files will be explained and how one can monitor communication with a SIM and inject arbitrary data into the session.
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16:24
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SecDocs
Tags:
smart card phone Event:
Chaos Communication Camp 2011 Abstract: This talk sheds some light on a cellphone-component, that's inevitable, virtually unclonable and as closed as it gets: the SIM. The SIM can do a lot more than just user-authentication nowadays: the SIM Application Toolkit gives it control over your phone Recently, location tracking in major smartphones caused quite a stir. Closed systems make discovering such unwanted behavior more difficult. While projects like osmocomBB aim at creating an open cellphone architecture, the SIM seems to be mostly inconsiderable and harmless. It's little known, that the SIM Application Toolkit (SAT) gives the SIM extensive control over the phone. Via the SAT, the SIM can obtain location information, monitor and redirect calls and send/receive short messages, as well as IP packets. The SIM-firmware can be updated over-the-air. Most of these features can even be used without the user noticing. Along with the mentioned SAT, this talk will illuminate the classic GSM SIM, as well as the 3G USIM altogether. After a quick introduction to smartcards in general, communication with the SIM will be explained in more detail. The most important SIM commands and files will be explained and how one can monitor communication with a SIM and inject arbitrary data into the session.
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14:42
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SecDocs
Authors:
Irmi Meister Tags:
satellite Event:
Chaos Communication Camp 2011 Abstract: In this lecture, I'll cover some satellite communication basics like pros and cons of different orbits, the characteristics of a satellite communications link and the difficulties regarding noise and attenuation when handling high frequency satellite communication systems. After a brief introduction to the history and development of satellites in general, we'll talk about different orbits and their characteristics regarding space conditions. After that, we'll have a look at a typical satellite communications link including channel characteristics, communications equipment and frequency considerations, before moving on to access techniques. If there's still time, there might be a short part about satellite navigation, too. And yes, to meet our need for pretty pictures, thematically related postage stamps (partly from a private collection) will be used to illustrate the topic.
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14:40
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SecDocs
Authors:
Irmi Meister Tags:
satellite Event:
Chaos Communication Camp 2011 Abstract: In this lecture, I'll cover some satellite communication basics like pros and cons of different orbits, the characteristics of a satellite communications link and the difficulties regarding noise and attenuation when handling high frequency satellite communication systems. After a brief introduction to the history and development of satellites in general, we'll talk about different orbits and their characteristics regarding space conditions. After that, we'll have a look at a typical satellite communications link including channel characteristics, communications equipment and frequency considerations, before moving on to access techniques. If there's still time, there might be a short part about satellite navigation, too. And yes, to meet our need for pretty pictures, thematically related postage stamps (partly from a private collection) will be used to illustrate the topic.
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21:35
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SecDocs
Authors:
Kay Hamacher Stefan Katzenbeisser Tags:
terrorism Event:
Chaos Communication Congress 27th (27C3) 2010 Abstract: Telecommunications data retention (TDR) has become a reality in most Western countries. Protagonists claim that the collection of massive amounts of data on the communication behavior of all individuals within a country would enable law enforcement agencies to exploit patterns in the stored data to uncover connections between suspects. While this is obviously true for investigations after an incident happened, there is up to now no critical and sound assessment publicly available that evaluates whether TDR brings any pro-active benefits for the above mentioned, justified purposes. In this talk we give for the first time a critical assessment of the power of TDR based on methods from information theory. To this end we have employed agent based simulations, which mimic the communication behavior of a large community including a dark-net of alleged suspects. The structure and statistics of our telecommunication simulation, which drive the dynamics of telephone calls and simulated TDR data, were generated according to known statistics of real-world telecommunications networks. Hiding in the unavoidable noise seems to be a passive strategy for terrorists to circumvent pro-active detection. This stems from a "needle in the haystack"-problem, that arises due to the small number of conspirators compared to the number of other participants. In particular situations and with adopted strategies suspected terrorists might be able to eventually exploit TDR for their purposes and take an active approach to hiding in the crowd. Such TDR exploits would lower the probability of detection by law enforcement agencies and render TDR a potential security threat. Again, we use our simulations and our analysis procedure to assess this problem.
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12:00
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SecDocs
Authors:
Wes Faler Tags:
network Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: Even after years of committee review, communication protocols can certainly be hacked, sometimes highly entertainingly. What about creating a protocol the opposite way? Start with all the hacks that can be done and search for a protocol that gets around them all. Is it even possible? Part Time Scientists has used a GPU to help design our moon mission protocols and we'll show you the what and how. Danger: Real code will be shown!
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11:49
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SecDocs
Authors:
Wes Faler Tags:
network Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: Even after years of committee review, communication protocols can certainly be hacked, sometimes highly entertainingly. What about creating a protocol the opposite way? Start with all the hacks that can be done and search for a protocol that gets around them all. Is it even possible? Part Time Scientists has used a GPU to help design our moon mission protocols and we'll show you the what and how. Danger: Real code will be shown!
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11:48
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SecDocs
Authors:
Wes Faler Tags:
network Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: Even after years of committee review, communication protocols can certainly be hacked, sometimes highly entertainingly. What about creating a protocol the opposite way? Start with all the hacks that can be done and search for a protocol that gets around them all. Is it even possible? Part Time Scientists has used a GPU to help design our moon mission protocols and we'll show you the what and how. Danger: Real code will be shown!
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22:36
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SecDocs
Authors:
Andreas Hornig Tags:
satellite Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: As proposed by Nick Farr et al at CCCamp11, we - the hacker community - are in desperate need for our own communication infrastructure. So here we are, answering the call for the Hacker Space Program with our proposal of a distributed satellite communications ground station network. An affordable way to bring satellite communications to a hackerspace near you. We're proposing a multi-step approach to work towards this goal by setting up a distributed network of ground stations which will ensure a 24/7 communication window - first tracking, then communicating with satellites. The current state of a proof of concept implementation will be presented. This is a project closely related to the academic femto-satellite movement, ham radio, Constellation@Home. The area of small satellites (femto-satellite
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22:36
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SecDocs
Authors:
Andreas Hornig Tags:
satellite Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: As proposed by Nick Farr et al at CCCamp11, we - the hacker community - are in desperate need for our own communication infrastructure. So here we are, answering the call for the Hacker Space Program with our proposal of a distributed satellite communications ground station network. An affordable way to bring satellite communications to a hackerspace near you. We're proposing a multi-step approach to work towards this goal by setting up a distributed network of ground stations which will ensure a 24/7 communication window - first tracking, then communicating with satellites. The current state of a proof of concept implementation will be presented. This is a project closely related to the academic femto-satellite movement, ham radio, Constellation@Home. The area of small satellites (femto-satellite
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22:36
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SecDocs
Authors:
Andreas Hornig Tags:
satellite Event:
Chaos Communication Congress 28th (28C3) 2011 Abstract: As proposed by Nick Farr et al at CCCamp11, we - the hacker community - are in desperate need for our own communication infrastructure. So here we are, answering the call for the Hacker Space Program with our proposal of a distributed satellite communications ground station network. An affordable way to bring satellite communications to a hackerspace near you. We're proposing a multi-step approach to work towards this goal by setting up a distributed network of ground stations which will ensure a 24/7 communication window - first tracking, then communicating with satellites. The current state of a proof of concept implementation will be presented. This is a project closely related to the academic femto-satellite movement, ham radio, Constellation@Home. The area of small satellites (femto-satellite
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12:00
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SecurityFocus Vulnerabilities
Cisco Security Advisory: Cisco TelePresence Video Communication Server Session Initiation Protocol Denial of Service Vulnerabilities
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12:01
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Hack a Day
Since most DSLR cameras now have an IR communication port, [Julius] thought it would be a good idea to build an IR shutter release remote. He has released the plans for two versions; a single sided hand etched one, and a double sided one to have made professionally. He notes that it should have a [...]
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21:41
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Packet Storm Security Recent Files
Call for participation for the 28C3 Chaos Communication Congress. The Chaos Communication Congress is the annual four-day conference organized by the Chaos Computer Club (CCC) in Berlin, Germany. First held in 1984, it has since established itself as "The European Hacker Conference" attracting a diverse audience of thousands of hackers, scientists, artists, and utopists from all around the world. It will be held from December 27th through the 30th, 2011.
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21:41
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Packet Storm Security Misc. Files
Call for participation for the 28C3 Chaos Communication Congress. The Chaos Communication Congress is the annual four-day conference organized by the Chaos Computer Club (CCC) in Berlin, Germany. First held in 1984, it has since established itself as "The European Hacker Conference" attracting a diverse audience of thousands of hackers, scientists, artists, and utopists from all around the world. It will be held from December 27th through the 30th, 2011.
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13:29
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SecDocs
Authors:
Kenton Born Tags:
covert channel Event:
Black Hat USA 2010 Abstract: This presentation analyzes a novel approach to covert communication over DNS by introducing PSUDP, a program demonstrating passive network-wide covert communication. While several high-bandwidth DNS tunnel implementations are freely available, they all use similar strategies. Storage channels are created in DNS requests by encoding data in subdomain labels, while responses take many forms such as TXT, NULL, and CNAME resource record types to complete the bi-directional link. However, these tunnels may be detected when examining subdomains and irregular resource records in responses. Additionally, these tunnels only provide communication through the active generation of traffic. The method and tool discussed in this paper allows a network of computers to participate in passive covert communication by piggy-backing on legitimate network DNS traffic. While low-bandwidth passive tunnels have been built using techniques such as timing channels and field manipulation, no passive high-bandwidth DNS tunnels exist. A novel approach is used to provide significantly higher bandwidth in network-wide covert communication by manipulating legitimate DNS traffic. It is also shown how, in certain scenarios, this method may be used for both covert data exfiltration and as a replacement for existing DNS tunnels. Additionally, it will be shown how a similar method can be applied to many other protocols, not being limited to DNS traffic. In addition to PSUDP, this presentation will briefly cover a few other recent findings I have had in DNS tunnel creation and detection. Firstly, I will show how bi-directional DNS tunnels may be created using a browser and fine-grained JavaScript manipulation. Secondly, I will show my work in detecting DNS tunnels using n-gram frequency analysis.
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13:29
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SecDocs
Authors:
Kenton Born Tags:
covert channel Event:
Black Hat USA 2010 Abstract: This presentation analyzes a novel approach to covert communication over DNS by introducing PSUDP, a program demonstrating passive network-wide covert communication. While several high-bandwidth DNS tunnel implementations are freely available, they all use similar strategies. Storage channels are created in DNS requests by encoding data in subdomain labels, while responses take many forms such as TXT, NULL, and CNAME resource record types to complete the bi-directional link. However, these tunnels may be detected when examining subdomains and irregular resource records in responses. Additionally, these tunnels only provide communication through the active generation of traffic. The method and tool discussed in this paper allows a network of computers to participate in passive covert communication by piggy-backing on legitimate network DNS traffic. While low-bandwidth passive tunnels have been built using techniques such as timing channels and field manipulation, no passive high-bandwidth DNS tunnels exist. A novel approach is used to provide significantly higher bandwidth in network-wide covert communication by manipulating legitimate DNS traffic. It is also shown how, in certain scenarios, this method may be used for both covert data exfiltration and as a replacement for existing DNS tunnels. Additionally, it will be shown how a similar method can be applied to many other protocols, not being limited to DNS traffic. In addition to PSUDP, this presentation will briefly cover a few other recent findings I have had in DNS tunnel creation and detection. Firstly, I will show how bi-directional DNS tunnels may be created using a browser and fine-grained JavaScript manipulation. Secondly, I will show my work in detecting DNS tunnels using n-gram frequency analysis.
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14:01
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Hack a Day
The usual way send data from a microcontroller is either over RS-232 with MAX232 serial ICs, crystals, and a relatively ancient computer, or by bit-banging the USB protocol and worrying about driver issues. Not content with these solutions, [Scott] came up with sound card μC/PC communication that doesn’t require any extra components. [Scott] bought a [...]
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17:55
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Packet Storm Security Exploits
HP OpenView Communication Broker (ovbbccb.exe versions 11.0.43.0 and below) suffer from an arbitrary file deletion vulnerability.
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19:01
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Packet Storm Security Recent Files
The Smart Communication Protocols and Algorithms (SCPA 2011) Call For Papers has been announced. It will take place December 5th through the 9th, 2011 in Houston, Texas in conjunction with Globecom 2011.
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19:01
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Packet Storm Security Misc. Files
The Smart Communication Protocols and Algorithms (SCPA 2011) Call For Papers has been announced. It will take place December 5th through the 9th, 2011 in Houston, Texas in conjunction with Globecom 2011.
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8:01
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Hack a Day
It’s a few years old, but [Brian360's] method of unlocking the hard drive on his Mitsubishi Multi-Communication System is quite interesting. Mitsubishi describes their MMCS as a human-vehicle communication tool. It’s basically an in-dash screen and controls to display navigation maps and play music. [Brian] found that the hard drive for the MMCS in his [...]
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11:57
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SecuriTeam
A directory traversal and file retrieval vulnerability was discovered in TANDBERG's Video Communication Server.
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Make your website safer. Use external penetration testing service. First report ready in one hour!
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16:55
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SecuriTeam
An SSH service authentication weakness vulnerability was discovered in the TANDBERG's Video Communication Server.
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Make your website safer. Use external penetration testing service. First report ready in one hour!
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5:51
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SecDocs
Authors:
Moxie Marlinspike Tags:
privacy Event:
Black Hat EU 2010 Abstract: We won the war for strong cryptography, anonymous darknets exist in the wild today, and decentralized communication networks have emerged to become reality. These strategies for communicating online were conceived of in anticipation of a dystopian future, but somehow these original efforts have fallen short of delivering us from the most pernicious threats to privacy that we're now facing. Rather than a centralized state-based database of all our communication and movements, modern threats to privacy have become something much more subtle, and perhaps all the more sinister. This talk will explore these evolving trends and discuss some interesting solutions in the works.
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1:47
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SecDocs
Authors:
Andre Adelsbach Tags:
wireless WiFi WiMAX Event:
Black Hat EU 2010 Abstract: Most wireless communication techniques are broadcast media by nature on the physical layer, i.e., the actual signal can be received by any party in a certain coverage area. A common means to perform secure unicast point-to-point communication over such wireless infrastructures is by applying cryptographic protocols on higher layers: both communication end-points (commonly user and carrier) set up a session key, which is then used to build private and authentic unicast communication by means of encryption and message authentication. As of today, a common assumption in the design and analysis of such communication protocols is that both end-points (user and carrier) behave correctly according to the cryptographic protocol, because they want to preserve security against outsiders. However, if carriers have more power/resources in terms of bandwidth or coverage, users may not be interested in protecting their unicast communication against outsiders at all. Instead, users may try to extend their communication power/resources by means of insider attacks against the communication protocol. Therefore, such insider attacks pose new threats to these protocols and have, to the best of our knowledge, been neglected so far. In this presentation we will present several insider attacks, which break the unicast communication imposed by the carrier of the infrastructure. The most striking example of highly asymmetric resources are satellite ISPs: here the user normally has a terrestrial link to the carrier and no means to broadcast data at all. On the other side, the carrier can broadcast its signals over huge footprints, covering thousands of kilometers. Therefore, we will illustrate our attacks mainly in terms of satellite ISPs, but also discuss other examples such as WIMAX. Our strongest insider attack allows any end-user to make the satellite ISP broadcast data as clear text, even if the downlink (data sent from the satellite to the user) is properly encrypted by the satellite ISP, thereby breaking the unicast communication structure imposed by the satellite ISP. Finally, we discuss how the presented findings can be used to set up communication channels, achieving perfect receiver anonymity.
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9:00
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Hack a Day
Hackaday alum [Will O'Brien] has been doing some cellphone integration work. He recently picked up some Motorola c168i cellphones from eBay. It turns out there is a serial port that uses TTL communication with a standard head-phone jack as an interface. [Will] soldered up a connector and used a USB to FTDI cable to interface [...]
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4:33
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SecDocs
Authors:
Fabian Yamaguchi Tags:
exploiting client side Event:
Chaos Communication Congress 26th (26C3) 2009 Abstract: We will be presenting a number of previously undisclosed network-related design errors, ranging from data-link-layer bugs in Ethernet-drivers across issues in TCP/IP stacks all the way up to communication infrastructure components on layer 5. Our focus is on subtle mistakes, which do not fall into the memory-corruption category and yet in combination provide an attacker with a powerful bag of tricks. Built around a fictional average company network, we will tell the story of an attack making use of subtle bugs across the layers all of which are as of yet undisclosed. This will include a bug in an Ethernet-driver, which allows an attacker to bypass MAC- and IP-based filters, bugs in TCP-implementations that are assumed to be fixed but aren't, a web-cache which confuses itself and an instant-messenger, which was fooled by the protocol specification. All of these bugs share a common property: They are a consequence of insecure design and not of insecure coding-practices.
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4:33
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SecDocs
Authors:
Fabian Yamaguchi Tags:
exploiting client side Event:
Chaos Communication Congress 26th (26C3) 2009 Abstract: We will be presenting a number of previously undisclosed network-related design errors, ranging from data-link-layer bugs in Ethernet-drivers across issues in TCP/IP stacks all the way up to communication infrastructure components on layer 5. Our focus is on subtle mistakes, which do not fall into the memory-corruption category and yet in combination provide an attacker with a powerful bag of tricks. Built around a fictional average company network, we will tell the story of an attack making use of subtle bugs across the layers all of which are as of yet undisclosed. This will include a bug in an Ethernet-driver, which allows an attacker to bypass MAC- and IP-based filters, bugs in TCP-implementations that are assumed to be fixed but aren't, a web-cache which confuses itself and an instant-messenger, which was fooled by the protocol specification. All of these bugs share a common property: They are a consequence of insecure design and not of insecure coding-practices.
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3:22
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SecDocs
Authors:
Jérémie Zimmermann Tags:
net neutrality Event:
Chaos Communication Congress 26th (26C3) 2009 Abstract: Net neutrality is an essential safeguard for competition, innovation, and fundamental freedoms. The debate is high in the US with the announce of FCC non discrimination principles (even if they sound irremediably bound to the interests of Hollywood industry). In the EU, the "Telecoms Package" has been the ground of intense debates on the issue. Dangerous provisions were voted, yet a very high level of awareness was raised, giving hope into further positive outcome of the debate. Why one shall care? What one can do about it? What is Net neutrality? Why is it crucial for the future of our online societies? What is the current state of Net neutrality legislation in the EU? What campaigns from civil societies, with what results? What will be the next steps? Net neutrality has been an indispensable catalyst of competition, innovation, and fundamental freedoms in the digital environment. A neutral Internet ensures that users face no conditions limiting access to applications and services. Likewise, it rules out any discrimination against the source, destination or actual content of the information transmitted over the network. Thanks to this principle, our society collectively built the Internet as we know it today. Except in some authoritarian regimes, everyone around the globe has access to the same Internet, and even the smallest entrepreneurs are on equal footing with the leading global enterprises. Moreover, Net neutrality stimulates the virtuous circle of a development model based on the growth of a common communication network that enables new uses and tools, as opposed to one relying on investments in filtering and controlling. Only under such conditions is Internet continuously improving our societies, enhancing freedom — including the freedom of expression and communication — and allowing for more efficient and creative markets. However, Net neutrality is now under the threat of telecom operators and content industries that see business opportunities in discriminating, filtering or prioritizing information flowing through the network. All around Europe, these kind of discriminatory practices, detrimental to both consumers and innovation, are emerging. No court or regulator seems to have adequate tools to counter these behaviors and preserve the general interest. Some provisions introduced in the EU "Telecoms Package" could even encourage such practices. We who build, use and love the Internet must be aware and active to protect it.