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gzip: Multiple vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200505-05 / gzip
Release Date May 09, 2005
Latest Revision May 09, 2005: 01
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-arch/gzip < 1.3.5-r6 >= 1.3.5-r6 All supported architectures

Related bugreports: #89946, #90626


gzip contains multiple vulnerabilities potentially allowing an attacker to execute arbitrary commands.

2.  Impact Information


gzip (GNU zip) is a popular compression program. The included zgrep utility allows you to grep gzipped files in place.


The gzip and gunzip programs are vulnerable to a race condition when setting file permissions (CAN-2005-0988), as well as improper handling of filename restoration (CAN-2005-1228). The zgrep utility improperly sanitizes arguments, which may come from an untrusted source (CAN-2005-0758).


These vulnerabilities could allow arbitrary command execution, changing the permissions of arbitrary files, and installation of files to an aribitrary location in the filesystem.

3.  Resolution Information


There is no known workaround at this time.


All gzip users should upgrade to the latest stable version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/gzip-1.3.5-r6"

4.  References


Page updated May 09, 2005

Summary: This is a Gentoo Linux Security Advisory

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