Ubuntu 11.10: USN-1296-1 Critical: acpid Local Code Execution

ubuntu

December 8, 2011

Several security issues were fixed in acpid.

Summary

Several security issues were fixed in acpid.

Software Description:

- acpid: Advanced Configuration and Power Interface daemon

Details:

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.

(CVE-2011-4578)

Topics Covered

security advisory update critical code execution local attack ubuntu acpid

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

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

In general, a standard system update will make all the necessary changes.