Ubuntu Security Notice USN-520-1
25th September, 2007
fetchmail vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 7.04
- Ubuntu 6.10
- Ubuntu 6.06 LTS
Software description
- fetchmail
Details
Gaetan Leurent discovered a vulnerability in the APOP protocol based
on MD5 collisions. As fetchmail supports the APOP protocol, this
vulnerability can be used by attackers to discover a portion of the APOP
user's authentication credentials. (CVE-2007-1558)
Earl Chew discovered that fetchmail can be made to de-reference a NULL
pointer when contacting SMTP servers. This vulnerability can be used
by attackers who control the SMTP server to crash fetchmail and cause
a denial of service. (CVE-2007-4565)
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 7.04:
- fetchmail 6.3.6-1ubuntu2.1
- Ubuntu 6.10:
- fetchmail 6.3.4-1ubuntu4.2
- Ubuntu 6.06 LTS:
- fetchmail 6.3.2-2ubuntu2.2
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.