22C3 - 2.2

22nd Chaos Communication Congress
Private Investigations

Martin Vuagnoux
Tag 2
Raum Saal 3
Beginn 22:00
Dauer 01:00
ID 606
Veranstaltungstyp Vortrag
Track Hacking
Sprache englisch

Autodafé: An Act of Software Torture

Presentation of an innovative buffer overflow uncovering technique called "Fuzzing by weighting attacks with markers"

Automated vulnerability searching tools have led to a dramatic increase of the rate at which such flaws are discovered. One particular searching technique is fault injection – i.e. insertion of random data into input files, buffers or protocol packets, combined with a systematic monitoring of memory violations. Even if these tools allow to uncover a lot of vulnerabilities, they are still very primitive; despite their poor efficiency, they are useful because of the very high density of such vulnerabilities in modern software.

This paper presents an innovative buffer overflow uncovering technique, which uses a more thorough and reliable approach. This technique, called "fuzzing by weighting attacks with markers", is a specialized kind of fault injection, which does not need source code or special compilation for the monitored program. As a proof of concept of the efficiency of this technique, a tool called Autodafé has been developed. It allows to detect automatically an impressive number of buffer overflow vulnerabilities.