USN-2146-1: Sudo vulnerabilities

Releases

• Ubuntu 13.10
• Ubuntu 12.10
• Ubuntu 12.04
• Ubuntu 10.04

Packages

• sudo - Provide limited super user privileges to specific users

Details

Sebastien Macke discovered that Sudo incorrectly filtered environment
variables when the env_reset option was disabled. A local attacker could
use this issue to possibly run unintended commands by using environment
variables that were intended to be blocked. In a default Ubuntu
installation, the env_reset option is enabled by default. This issue only
affected Ubuntu 10.04 LTS and Ubuntu 12.04 LTS. (CVE-2014-0106)

It was discovered that the Sudo init script set a date in the past on
existing timestamp files instead of using epoch to invalidate them
completely. A local attacker could possibly modify the system time to
attempt to reuse timestamp files. This issue only applied to Ubuntu
12.04 LTS, Ubuntu 12.10 and Ubuntu 13.10. (LP: #1223297)

Update instructions

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

Ubuntu 13.10

• sudo - 1.8.6p3-0ubuntu3.1
• sudo-ldap - 1.8.6p3-0ubuntu3.1

Ubuntu 12.10

• sudo - 1.8.5p2-1ubuntu1.2
• sudo-ldap - 1.8.5p2-1ubuntu1.2

Ubuntu 12.04

• sudo - 1.8.3p1-1ubuntu3.6
• sudo-ldap - 1.8.3p1-1ubuntu3.6

Ubuntu 10.04

• sudo - 1.7.2p1-1ubuntu5.7
• sudo-ldap - 1.7.2p1-1ubuntu5.7

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

References

• CVE-2014-0106
• https://launchpad.net/bugs/1223297