cups, cupsys vulnerabilities

12 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 versions:

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.

References

• CVE-2008-5183
• CVE-2008-5184
• CVE-2008-5286
• CVE-2008-5377