Ubuntu Security Notice USN-1296-1
8th December, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Several security issues were fixed in acpid.
- acpid - Advanced Configuration and Power Interface daemon
Oliver-Tobias Ripka discovered that an ACPI script incorrectly handled power
button events. A local attacker could use this to execute arbitrary code, and
possibly escalate privileges. (CVE-2011-2777)
Helmut Grohne and Michael Biebl discovered that ACPI scripts were executed with
a permissive file mode creation mask (umask). A local attacker could read files
and modify directories created by ACPI scripts that did not set a strict umask.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- acpid 1:2.0.10-1ubuntu2.3
- Ubuntu 11.04:
- acpid 1:2.0.7-1ubuntu2.4
- Ubuntu 10.10:
- acpid 1.0.10-5ubuntu4.4
- Ubuntu 10.04 LTS:
- acpid 1.0.10-5ubuntu2.5
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.