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[gentoo-announce] GLSA: unzip
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Joined: 17 Apr 2002
Posts: 3657
Location: San Francisco, CA

PostPosted: Tue Oct 01, 2002 1:50 pm    Post subject: [gentoo-announce] GLSA: unzip Reply with quote

Daniel Ahlberg wrote:
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- - --------------------------------------------------------------------

PACKAGE \240 \240 \240 \240:unzip
SUMMARY \240 \240 \240 \240:directory-traversal vulnerability
DATE \240 \240 \240 \240 \240 :2002-10-01 10:30 UTC

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Archive extraction is usually treated by users as a safe operation. There are few problems with files extraction though.


Among them: huge files with high compression ratio are able to fill memory/disk (see "Antivirus scanner DoS with zip archives" thread on Vuln-Dev), special device names and special characters in file names, directory traversal (dot-dot bug). Probably, directory traversal is most dangerous among this bugs, because it allows to craft archive which will trojan system on extraction. This problem is known for software developers, and newer archivers usually have some kind of protection. But in some cases this protection is weak and can be bypassed. I did very quick (approx. 30 minutes, so may be I've missed something) researches on few popular archivers. Results are below.

Read the full advisory at


It is recommended that all Gentoo Linux users who are running app-arch/unzip-5.42-r1 and earlier update their systems as follows:

emerge rsync
emerge unzip
emerge clean

- - -------------------------------------------------------------------- - GnuPG key is available at
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