Ubuntu Security Notice USN-1295-1
8th December, 2011
dovecot vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
Summary
Dovecot could be made to expose sensitive information over the network.
Software description
- dovecot - IMAP and POP3 email server
Details
It was discovered that Dovecot incorrectly validated certificate hostnames
when being used as a POP3 and IMAP proxy. If a remote attacker were able to
perform a man-in-the-middle attack, this flaw could be exploited to view
sensitive information.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- dovecot-common 1:2.0.13-1ubuntu3.2
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.