Shorewall : Insecure temp file handling
Gentoo Linux Security Advisory
||GLSA 200407-07 / Shorewall
||July 08, 2004
||May 22, 2006: 02
All supported architectures
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.
Shorewall is a high level tool for configuring Netfilter, the firewall
facility included in the Linux Kernel.
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.
An attacker could exploit this vulnerability to overwrite arbitrary
system files with root privileges, resulting in Denial of Service or
There is no known workaround at this time. All users should upgrade to
the latest available version of Shorewall.
All users should upgrade to the latest available version of Shorewall,
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=net-firewall/shorewall-1.4.10f"
# emerge ">=net-firewall/shorewall-1.4.10f"