Ubuntu Security Notice USN-1221-1
September 29, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
An attacker could trick mutt into trusting a rogue server.
- mutt: text-based mailreader supporting MIME, GPG, PGP and threading
It was discovered that mutt incorrectly verified the hostname in an SSL
certificate. An attacker could trick mutt into trusting a rogue SMTPS,
IMAPS, or POP3S server's certificate, which was signed by a trusted certificate
authority, to perform a man-in-the-middle attack.
The problem can be corrected by updating your system to the following
Ubuntu 10.04 LTS:
After a standard system update you need to restart mutt to make
all the necessary changes. Users are encouraged to verify their
~/.mutt_certificates file to ensure only trusted certificates are listed.