sudo: Privilege escalation

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 201003-01 / sudo
Release Date	March 03, 2010
Latest Revision	March 03, 2010: 01
Impact	high
Exploitable	local

Package	Vulnerable versions	Unaffected versions	Architecture(s)
app-admin/sudo	< 1.7.2_p4	>= 1.7.2_p4	All supported architectures

Related bugreports: #306865

Synopsis

Two vulnerabilities in sudo might allow local users to escalate privileges and execute arbitrary code with root privileges.

2. Impact Information

Background

sudo allows a system administrator to give users the ability to run commands as other users.

Description

Multiple vulnerabilities have been discovered in sudo:

Glenn Waller and neonsignal reported that sudo does not properly handle access control of the "sudoedit" pseudo-command (CVE-2010-0426).
Harald Koenig reported that sudo does not properly set supplementary groups when using the "runas_default" option (CVE-2010-0427).

Impact

A local attacker with privileges to use "sudoedit" or the privilege to execute commands with the "runas_default" setting enabled could leverage these vulnerabilities to execute arbitrary code with elevated privileges.

3. Resolution Information

Workaround

CVE-2010-0426: Revoke all "sudoedit" privileges, or use the full path to sudoedit. CVE-2010-0427: Remove all occurrences of the "runas_default" setting.

Resolution

All sudo users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-admin/sudo-1.7.2_p4"

4. References

Page updated March 03, 2010

Summary: This is a Gentoo Linux Security Advisory

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