LutelWall: Insecure temporary file creation

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200506-10 / LutelWall
Release Date	June 11, 2005
Latest Revision	June 11, 2005: 01
Impact	normal
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-firewall/lutelwall	< 0.98	>= 0.98	All supported architectures

Related bugreports: #95378

Synopsis

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

2. Impact Information

Background

LutelWall is a high-level Linux firewall configuration tool.

Description

Eric Romang has discovered that the new_version_check() function in LutelWall insecurely creates a temporary file when updating to a new version.

Impact

A local attacker could create symbolic links in the temporary file directory, pointing to a valid file somewhere on the filesystem. When the update script is executed (usually by the root user), this would result in the file being overwritten with the rights of this user.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All LutelWall users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-firewall/lutelwall-0.98"

4. References

CAN-2005-1879

Updated June 11, 2005

Summary: This is a Gentoo Linux Security Advisory

Security Team
Contact Address

Donate to support our development efforts.