Termin:Chaotic-Congress-Cinema-28C3 Nr. 24

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Chaotic Congress Cinema Nr. 24

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Needs to be there, but does not need to be seen by a visitor Yes


Achtung: Der Projektor ist eingeschickt, die Teilnehmer muessen sich als eine Loesung zum Schauen der Videos engineeren (i.e. auf dem eigenen Laptop oder so).

Wir schauen uns die Aufzeichnung von Congress-Vorträgen an. Du bist herzlich eingeladen, in den Clubräumen im Mexikoring 21 aufzutauchen und mit uns die Talks anzuschauen und zu diskutieren. Es wird Getränke und Knabberkram zu moderaten Preisen geben. Falls Du kein CCC-, CCCHH- oder Attraktor e.V.-Mitglied bist, macht das überhaupt nichts: Alle Gäste sind gern gesehen. :-)

Weitere Informationen unter Chaotic Congress Cinema.

802.11 Packets in Packets

A Standard-Compliant Exploit of Layer 1

New to 2011, Packet-in-Packet exploits allow for injection of raw radio frames into remote wireless networks. In these exploits, an attacker crafts a string that when transmitted over the air creates the symbols of a complete and valid radio packet. When radio interference damages the beginning of the outer packet, the receiver is tricked into seeing only the inner packet, allowing a frame to be remotely injected. The attacker requires no radio, and injection occurs without a software or hardware bug.

This lecture presents the first implementation of Packet-in-Packet injection for 802.11B, allowing malicious PHY-Layer frames to be remotely injected. The attack is standards-compliant and compatible with all vendors and drivers.

Unlike the simpler implementations for 802.15.4 and 2FSK, 802.11B presents a number of unique challenges to the PIP implementer. A single packet can use up to three symbol sets and three data-rates, switching rates once within the header and a second time for the beginning of the body. Additionally, a 7-bit scrambler randomizes the encoding of each packet, so the same string of text can be represented 128 different ways at the exact same rate and encoding.

This lecture presents the first implementation of Packet-in-Packet injection for 802.11B, allowing malicious PHY-Layer frames to be remotely injected. The attack is standards-compliant and compatible with all vendors and drivers.

As a demo, we intend to present a malicious string which can be embedded in any file with lots of slack space, such as an ISO image. When this image is downloaded over HTTP on 802.11B, beacon frames will be injected. For the demo, we will be injecting the SSID stack buffer overflow frames from Uninformed Volume 6.


Security Log Visualization with a Correlation Engine

What's inside your network?

This brief session focuses on the visualization of actual security incidents, network forensics and counter surveillance of covert criminal communications utilizing large data sets from various security logs and a very brief introduction to correlation engine logic. Visually displaying security or network issues can express the risk or urgency in a way a set of dry logs or other methods might not be able to. Additionally, many organizations rely on a more singular approach and react to security events, many times from a high false positive rate source such as isolated intrusion prevention or firewall alerts, or relying only on anti-virus alerts. Utilizing a correlation engine (especially open source) or similar applications could offer a method of discovering or in some cases proactively detecting issues. The research discussed involves analysis and interrogation of firewall, intrusion detection and prevention systems, web proxy logs and available security research. What does a compromised server infected with spam malware look like or cyber warfare?

A 20 minute presentation of data visualization and investigation scenarios of five actual issues discovered using various security logs and a correlation engine. The lecturer will take you on a visual journey from seemingly mundane entries in firewall logs through to detecting covert communications between a corporate web server and a cyber-criminal drop zone. Additional visualizations presented: a United Kingdom based portion of the South Korean DNS Distributed Denial of Service attacks of July/August 2008, what bypassing deep packet inspection using HTTPS/SSL/TLS looks like, detecting a rouge corporate email server, malicious DNS usage and more. Although the presenter used a commercial correlation engine, the presentation will conclude with the discussion of an open source correlation engine.

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