Sudo group ID privilege escalation

sudo-groupid-privilege-escalation (64636) The risk level is classified as HighHigh Risk

Description:

Sudo could allow a local attacker to gain elevated privileges on the system, caused by the failure to restrict access to changes of the group ID (GID). If Sudo is configured using a certain syntax, a local attacker could exploit this vulnerability using the sudo -g command to gain elevated privileges on the system and change into a restricted GID without entering a password.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Apply the patch for this vulnerability, available from the Mercurial Repository. See References.

References:

  • Debian Bug report logs - #609641: sudo doesn't ask for password when only the GID is changed.
  • Sudo Web site: Sudo Main Page.
  • BID-45774: Todd Miller Sudo Group ID Change Security Vulnerability
  • CVE-2011-0010: check.c in sudo 1.7.x before 1.7.4p5, when a Runas group is configured, does not require a password for command execution that involves a gid change but no uid change, which allows local users to bypass an intended authentication requirement via the -g option to a sudo command.
  • OSVDB ID: 70400: sudo check.c Runas Group Authentication Bypass
  • RHSA-2011-0599: Low: sudo security and bug fix update
  • RHSA-2012-0309: Low: sudo security and bug fix update
  • SA42886: Sudo Group Changing Vulnerability
  • SUSE-SR:2011:002: SUSE Security Summary Report

Platforms Affected:

  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • Todd C. Miller Sudo 1.7.4p4

Reported:

Jan 11, 2011

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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