It would probably be a good idea to implement ulimit restrictions on the user that the software runs as.
I had awful problems with the syntax on that sentence, but I am sure you will know what it means. :) Also you should be aware that the software doesn't automatically clear the leftovers out of the filesystem. One suggestion I've heard is to put the directory where the zip files get unpacked for software forensics & antivirus detection be on tmpfs or some such. That way, after a reboot its guaranteed to not be there. Or something like that. (my favorite sentence) > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Dr. Peter Bieringer > Sent: Saturday, 10 January 2004 6:38 > To: [EMAIL PROTECTED]; [EMAIL PROTECTED] > Subject: [Full-Disclosure] bzip2 bombs still causes problems > in antivirus-software > > > Hi, > > sure you remember the e-mail from Steve Wray in August 2003 > about bzip2 > bombs and the possible DoS against antivirus-software: > http://lists.netsys.com/pipermail/full-disclosure/2003-August/ > 009255.html > > We found that this is still an issue, especially we found > that one vendor > detects bzip2 bombs by pattern (2 GB of zeros are detected, > but not 2 GB of > e.g. 0x31). > > Also others will neither detect the bomb, nor stopping > decompression, looks > like they missing smart code for anomaly detection and/or > proper limits and > eat all existing disk space and CPU power instead of > reporting a problem. > > > Namely we confirm this issue still exists on: > > * kavscanner of > Kaspersky AntiVirus for Linux 5.0.1.0 (probably all > versions since 4.5) > * vscan of > Trend Micro InterScan VirusWall 3.8 Build 1130 > * uvscan of > McAfee Virus Scan for Linux v4.16.0 > > > Probably other versions and products are vulnerable, too. > > > Full advisory is available here: > http://www.aerasec.de/security/advisories/txt/bzip2bomb-antivirusengines .txt Hope this helps to bring this issue up again on software vendors to implement more smarter anomaly detection code and configurable limits (number of files, max size) in the decompression unit. Regards, Dr. Peter Bieringer -- Dr. Peter Bieringer Phone: +49-8102-895190 AERAsec Network Services and Security GmbH Fax: +49-8102-895199 Wagenberger Stra�e 1 Mobile: +49-174-9015046 D-85662 Hohenbrunn E-Mail: [EMAIL PROTECTED] Germany Internet: http://www.aerasec.de _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
