Wow, This is a very interesting concept. Any vendor that relies on any decompresion library could be vulnerable. Anything from something like Photoshop to IE to virus scanners. The example files given on the website seem to require a password. Can you provide it? Nice work and thanks! Dave Bachtel IT Intern RealTime Gaming Atlanta, GA - USA 404-459-4263 x139 ââââ -----Original Message----- From: Matthias Leu [mailto:mleu@aerasec.de] Sent: Tuesday, February 03, 2004 12:04 PM To: bugtraq@securityfocus.com Subject: Decompression Bombs As a followup to http://www.securityfocus.com/bid/9393/, where we pointed out vulnerabilities of some antivirus-gateways while decompressing bzip2-bombs, we were interested in the behaviour of various applications that process compressed data. It looks as if not only bzip2 bombs, but also decompression bombs in general might cause problems. Compression is used in many applications, but hardly any maximum size limits are checked during the decompression of untrusted content. We've created several bombs (bzip2, gzip, zip, mime-embedded bombs, png and gif graphics, openoffice zip bombs). With these we tested some more applications like additional antivirus engines, various web browsers, openoffice.org, and the Gimp. As a result, much more applications as we thought crashed. The manufacturers of software should care more about the processing of untrusted input. For details see our full advisory, written by Dr. Peter Bieringer: http://www.aerasec.de/security/advisories/decompression-bomb-vulnerability.html Best regards, Dr. Matthias Leu -- AERAsec Network Services and Security GmbH Wagenberger Strasse 1 D-85662 Hohenbrunn, Germany http://www.aerasec.de
