Ubuntu Security Notice USN-189-1
29th September, 2005
cpio vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 5.04
- Ubuntu 4.10
Details
Imran Ghory found a race condition in the handling of output files.
While a file was unpacked with cpio, a local attacker with write
permissions to the target directory could exploit this to change the
permissions of arbitrary files of the cpio user. (CAN-2005-1111)
Imran Ghory discovered a path traversal vulnerability. Even when the
--no-absolute-filenames option was specified, cpio did not filter out
".." path components. By tricking an user into unpacking a malicious
cpio archive, this could be exploited to install files in arbitrary
paths with the privileges of the user calling cpio. (CAN-2005-1229)
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 5.04:
- cpio
- Ubuntu 4.10:
- cpio
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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