LutelWall: Insecure temporary file creation — GLSA 200506-10

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

Affected Packages

net-firewall/lutelwall on all architectures
Affected versions < 0.98
Unaffected versions >= 0.98

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.

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

Release Date
June 11, 2005

Latest Revision
June 11, 2005: 01

Severity
normal

Exploitable
local

Bugzilla entries