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Ubuntu Security Notice USN-2455-1

Ubuntu Security Notice USN-2455-1
Posted Jan 7, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2455-1 - It was discovered that bsd-mailx contained a feature that allowed syntactically valid email addresses to be treated as shell commands. A remote attacker could possibly use this issue with a valid email address to execute arbitrary commands. This functionality has now been disabled by default, and can be re-enabled with the "expandaddr" configuration option. This update alone does not remove all possibilities of command execution. In environments where scripts use mailx to process arbitrary email addresses, it is recommended to modify them to use a "--" separator before the address to properly handle those that begin with "-". Various other issues were also addressed.

tags | advisory, remote, arbitrary, shell
systems | linux, bsd, ubuntu
advisories | CVE-2014-7844
SHA-256 | f5350ed84b2d35ccb571b03e756d99bfc727e95b63b04252b351e7a632505545

Ubuntu Security Notice USN-2455-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2455-1
January 07, 2015

bsd-mailx vulnerability
============================================================================

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

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

bsd-mailx could be made to run programs if it parsed a specially crafted
email address.

Software Description:
- bsd-mailx: simple mail user agent

Details:

It was discovered that bsd-mailx contained a feature that allowed
syntactically valid email addresses to be treated as shell commands. A
remote attacker could possibly use this issue with a valid email address to
execute arbitrary commands.

This functionality has now been disabled by default, and can be re-enabled
with the "expandaddr" configuration option. This update alone does not
remove all possibilities of command execution. In environments where
scripts use mailx to process arbitrary email addresses, it is recommended
to modify them to use a "--" separator before the address to properly
handle those that begin with "-".

Update instructions:

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

Ubuntu 14.10:
bsd-mailx 8.1.2-0.20131005cvs-1ubuntu0.14.10.1

Ubuntu 14.04 LTS:
bsd-mailx 8.1.2-0.20131005cvs-1ubuntu0.14.04.1

Ubuntu 12.04 LTS:
bsd-mailx 8.1.2-0.20111106cvs-1ubuntu0.1

Ubuntu 10.04 LTS:
bsd-mailx 8.1.2-0.20090911cvs-2ubuntu1.1

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

References:
http://www.ubuntu.com/usn/usn-2455-1
CVE-2014-7844

Package Information:

https://launchpad.net/ubuntu/+source/bsd-mailx/8.1.2-0.20131005cvs-1ubuntu0.14.10.1

https://launchpad.net/ubuntu/+source/bsd-mailx/8.1.2-0.20131005cvs-1ubuntu0.14.04.1
https://launchpad.net/ubuntu/+source/bsd-mailx/8.1.2-0.20111106cvs-1ubuntu0.1
https://launchpad.net/ubuntu/+source/bsd-mailx/8.1.2-0.20090911cvs-2ubuntu1.1
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