DistUpgrade/DistUpgradeFetcherCore.py in Update Manager before 1:0.87.31.1, 1:0.134.x before 1:0.134.11.1, 1:0.142.x before 1:0.142.23.1, 1:0.150.x before 1:0.150.5.1, and 1:0.152.x before 1:0.152.25.5 on Ubuntu 8.04 through 11.10 does not verify the GPG signature before extracting an upgrade tarball, which allows man-in-the-middle attackers to (1) create or overwrite arbitrary files via a directory traversal attack using a crafted tar file, or (2) bypass authentication via a crafted meta-release file.
| Software | From | Fixed in |
|---|---|---|
| canonical / ubuntu_linux | 10.10 | 10.10.x |
| canonical / ubuntu_linux | 8.04 | 8.04.x |
| canonical / ubuntu_linux | 11.04 | 11.04.x |
| canonical / update-manager | 1-0.152.25 | 1-0.152.25.x |
| canonical / ubuntu_linux | 11.10 | 11.10.x |
| canonical / update-manager | - | 1\:0.87.24.x |
| canonical / update-manager | 1-0.134.7 | 1-0.134.7.x |
| canonical / update-manager | 1-0.142.19 | 1-0.142.19.x |
| canonical / update-manager | 1-0.150 | 1-0.150.x |
| canonical / ubuntu_linux | 10.04 | 10.04.x |