Articles / Ubuntu: New acpid packages …

Ubuntu: New acpid packages fix security vulnerabilities

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. 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. Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1296-1
December 08, 2011

acpid vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS

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)

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.

References:
 http://www.ubuntu.com/usn/usn-1296-1
 CVE-2011-2777, CVE-2011-4578

Package Information:
 https://launchpad.net/ubuntu/+source/acpid/1:2.0.10-1ubuntu2.3
 https://launchpad.net/ubuntu/+source/acpid/1:2.0.7-1ubuntu2.4
 https://launchpad.net/ubuntu/+source/acpid/1.0.10-5ubuntu4.4
 https://launchpad.net/ubuntu/+source/acpid/1.0.10-5ubuntu2.5
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