Ubuntu: 1588-1: Software Properties vulnerability
Posted by Benjamin D. Thomas   
Ubuntu Software Properties could be tricked into installing arbitrary PPA GPG keys.
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Ubuntu Security Notice USN-1588-1
October 01, 2012

software-properties vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.04 LTS

Summary:

Software Properties could be tricked into installing arbitrary PPA GPG keys.

Software Description:
- software-properties: manage the repositories that you install software
from

Details:

It was discovered that the apt-add-repository tool incorrectly validated
PPA GPG keys when importing from a keyserver. If a remote attacker were
able to perform a man-in-the-middle attack, this flaw could be exploited to
install altered package repository GPG keys.

Update instructions:

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

Ubuntu 12.04 LTS:
  python-software-properties      0.82.7.3

Ubuntu 11.10:
  python-software-properties      0.81.13.5

Ubuntu 11.04:
  python-software-properties      0.80.9.2

Ubuntu 10.04 LTS:
  python-software-properties      0.75.10.3

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

References:
  http://www.ubuntu.com/usn/usn-1588-1
  https://launchpad.net/bugs/1016643

Package Information:
  https://launchpad.net/ubuntu/+source/software-properties/0.82.7.3
  https://launchpad.net/ubuntu/+source/software-properties/0.81.13.5
  https://launchpad.net/ubuntu/+source/software-properties/0.80.9.2
  https://launchpad.net/ubuntu/+source/software-properties/0.75.10.3