LutelWall: Insecure temporary file creation

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"