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Ubuntu Security Notice USN-1296-1

Ubuntu Security Notice USN-1296-1
Posted Dec 9, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1296-1 - 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. Various other issues were also addressed.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2011-2777, CVE-2011-4578
MD5 | 9ba984edb30803a1c19c4bed3fbbcac7

Ubuntu Security Notice USN-1296-1

Change Mirror Download
==========================================================================
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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