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eix: Insecure temporary file creation

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200511-19 / eix
Release Date November 22, 2005
Latest Revision May 22, 2006: 02
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-portage/eix < 0.5.0_pre2 >= 0.5.0_pre2, revision >= 0.3.0-r2 All supported architectures

Related bugreports: #112061

Synopsis

eix has an insecure temporary file creation vulnerability, potentially allowing a local user to overwrite arbitrary files.

2.  Impact Information

Background

eix is a small utility for searching ebuilds with indexing for fast results.

Description

Eric Romang discovered that eix creates a temporary file with a predictable name. eix creates a temporary file in /tmp/eix.*.sync where * is the process ID of the shell running eix.

Impact

A local attacker can watch the process list and determine the process ID of the shell running eix while the "emerge --sync" command is running, then create a link from the corresponding temporary file to a system file, which would result in the file being overwritten with the rights of the user running the application.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All eix users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose app-portage/eix

4.  References



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Page updated November 22, 2005

Summary: This is a Gentoo Linux Security Advisory

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