gzip: Multiple vulnerabilities

1. Gentoo Linux Security Advisory

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

Synopsis

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

2. Impact Information

Background

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

Description

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).

Impact

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

Workaround

There is no known workaround at this time.

Resolution

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

Updated May 09, 2005

Summary: This is a Gentoo Linux Security Advisory

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