Ubuntu Security Notice USN-707-1
12th January, 2009
cups, cupsys vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.10
- Ubuntu 8.04 LTS
- Ubuntu 7.10
- Ubuntu 6.06 LTS
Software description
- cups
- cupsys
Details
It was discovered that CUPS didn't properly handle adding a large number of RSS
subscriptions. A local user could exploit this and cause CUPS to crash, leading
to a denial of service. This issue only applied to Ubuntu 7.10, 8.04 LTS and
8.10. (CVE-2008-5183)
It was discovered that CUPS did not authenticate users when adding and
cancelling RSS subscriptions. An unprivileged local user could bypass intended
restrictions and add a large number of RSS subscriptions. This issue only
applied to Ubuntu 7.10 and 8.04 LTS. (CVE-2008-5184)
It was discovered that the PNG filter in CUPS did not properly handle certain
malformed images. If a user or automated system were tricked into opening a
crafted PNG image file, a remote attacker could cause a denial of service or
execute arbitrary code with user privileges. In Ubuntu 7.10, 8.04 LTS, and 8.10,
attackers would be isolated by the AppArmor CUPS profile. (CVE-2008-5286)
It was discovered that the example pstopdf CUPS filter created log files in an
insecure way. Local users could exploit a race condition to create or overwrite
files with the privileges of the user invoking the program. This issue only
applied to Ubuntu 6.06 LTS, 7.10, and 8.04 LTS. (CVE-2008-5377)
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 8.10:
- cups 1.3.9-2ubuntu6.1
- Ubuntu 8.04 LTS:
- cupsys 1.3.7-1ubuntu3.3
- Ubuntu 7.10:
- cupsys 1.3.2-1ubuntu7.9
- Ubuntu 6.06 LTS:
- cupsys 1.2.2-0ubuntu0.6.06.12
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.