ipsec-tools contains an X.509 certificates vulnerability.
Gentoo Linux Security Advisory
||GLSA 200404-05 / ipsec-tools
||April 07, 2004
||April 07, 2004: 01
ipsec-tools contains a vulnerability that affects connections authenticated
with X.509 certificates.
From http://ipsec-tools.sourceforge.net/ :
"IPsec-Tools is a port of KAME's IPsec utilities to the Linux-2.6
racoon (a utility in the ipsec-tools package) does not verify digital
signatures on Phase1 packets. This means that anybody holding the correct
X.509 certificate would be able to establish a connection, even if they did
not have the corresponding private key.
Since digital signatures are not verified by the racoon tool, an attacker may
be able to connect to the VPN gateway and/or execute a man-in-the-middle attack.
A workaround is not currently known for this issue. All users are advised
to upgrade to the latest version of the affected package.
ipsec-tools users should upgrade to version 0.2.5 or later:
Code Listing 3.1: Resolution
# emerge sync
# emerge -pv ">=net-firewall/ipsec-tools-0.2.5"
# emerge ">=net-firewall/ipsec-tools-0.2.5"