Gentoo Logo

mirrorselect: Insecure temporary file creation


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200412-05 / mirrorselect
Release Date December 07, 2004
Latest Revision May 22, 2006: 04
Impact normal
Exploitable local
Package Vulnerable versions Unaffected versions Architecture(s)
app-portage/mirrorselect < 0.89 >= 0.89 All supported architectures

Related bugreports: #73545


mirrorselect is vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files.

2.  Impact Information


mirrorselect is a tool to help select distfiles mirrors for Gentoo.


Ervin Nemeth discovered that mirrorselect creates temporary files in world-writable directories with predictable names.


A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When mirrorselect is executed, this would result in the file being overwritten with the rights of the user running the utility, which could be the root user.

3.  Resolution Information


There is no known workaround at this time.


All mirrorselect users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-portage/mirrorselect-0.89"

4.  References


Page updated December 07, 2004

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.

Copyright 2001-2015 Gentoo Foundation, Inc. Questions, Comments? Contact us.