GLSA 200506-10: LutelWall: Insecure temporary file creation

http://security.gentoo.org/

Severity:	normal
Title:	LutelWall: Insecure temporary file creation
Date:	06/11/2005
Bugs:	#95378
ID:	200506-10

Synopsis

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

Background

LutelWall is a high-level Linux firewall configuration tool.

Affected packages

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

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.

Workaround

There is no known workaround at this time.

Resolution

All LutelWall users should upgrade to the latest version:

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

References

CAN-2005-1879

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200506-10.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.