Aptdaemon 0.43 in Ubuntu 11.10 and 12.04 LTS uses short IDs when importing PPA GPG keys from a keyserver, which allows remote attackers to install arbitrary package repository GPG keys via a man-in-the-middle (MITM) attack.
Absolute path traversal vulnerability in the org.debian.apt.UpdateCachePartially method in worker.py in Aptdaemon 0.40 in Ubuntu 10.10 and 11.04 allows local users to read arbitrary files via a full pathname in the sourceslist argument, related to the D-Bus interface.