[ GLSA 200407-07 ] Shorewall : Insecure temp file handling

GLSA · Last edited by GLSA on Tue May 23, 2006 4:17 am; edited 2 times in total

Gentoo Linux Security Advisory

Title: Shorewall : Insecure temp file handling (GLSA 200407-07)
Severity: normal
Exploitable: local
Date: July 08, 2004
Updated: May 22, 2006
Bug(s): #55675
ID: 200407-07

Synopsis

Shorewall contains a bug in the code handling the creation of temporary files and directories. This can allow a non-root user to overwrite arbitrary system files.

Background

Shorewall is a high level tool for configuring Netfilter, the firewall facility included in the Linux Kernel.

Affected Packages

Package: net-firewall/shorewall
Vulnerable: <= 1.4.10c
Unaffected: >= 1.4.10f
Architectures: All supported architectures

Description

Shorewall uses temporary files and directories in an insecure manner. A local user could create symbolic links at specific locations, eventually overwriting other files on the filesystem with the rights of the shorewall process.

Impact

An attacker could exploit this vulnerability to overwrite arbitrary system files with root privileges, resulting in Denial of Service or further exploitation.

Workaround

There is no known workaround at this time. All users should upgrade to the latest available version of Shorewall.

Resolution

All users should upgrade to the latest available version of Shorewall, as follows: