Ubuntu Security Notice USN-1113-1

18th April, 2011

postfix vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

• Ubuntu 10.10



• Ubuntu 10.04 LTS



• Ubuntu 9.10



• Ubuntu 8.04 LTS



• Ubuntu 6.06 LTS

Summary

An attacker could send crafted input to Postfix and cause it to reveal
confidential information.

Software description

• postfix
  - High-performance mail transport agent
  
  

Details

It was discovered that the Postfix package incorrectly granted write access
on the PID directory to the postfix user. A local attacker could use this
flaw to possibly conduct a symlink attack and overwrite arbitrary files.
This issue only affected Ubuntu 6.06 LTS and 8.04 LTS. (CVE-2009-2939)

Wietse Venema discovered that Postfix incorrectly handled cleartext
commands after TLS is in place. A remote attacker could exploit this to
inject cleartext commands into TLS sessions, and possibly obtain
confidential information such as passwords. (CVE-2011-0411)

Update instructions

The problem can be corrected by updating your system to the following
package version:

Ubuntu 10.10:

postfix

2.7.1-1ubuntu0.1

Ubuntu 10.04 LTS:

postfix

2.7.0-1ubuntu0.1

Ubuntu 9.10:

postfix

2.6.5-3ubuntu0.1

Ubuntu 8.04 LTS:

postfix

2.5.1-2ubuntu1.3

Ubuntu 6.06 LTS:

postfix

2.2.10-1ubuntu0.3

In general, a standard system update will make all the necessary changes.

References

CVE-2009-2939,

CVE-2011-0411