Ubuntu 2146-1 Critical Advisory: Sudo Local Attack Risks

ubuntu

March 13, 2014

Several security issues were fixed in Sudo.

Summary

Several security issues were fixed in Sudo.

Software Description:

- sudo: Provide limited super user privileges to specific users

Details:

Sebastien Macke discovered that Sudo incorrectly handled blacklisted

environment variables when the env_reset option was disabled. A local

attacker could use this issue to possibly run unintended commands by using

blacklisted environment variables. 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)

Topics Covered

security advisory sudo local attack ubuntu security issues permission management

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 LTS:
  sudo                            1.8.3p1-1ubuntu3.6
  sudo-ldap                       1.8.3p1-1ubuntu3.6

Ubuntu 10.04 LTS:
  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.