20764 : Sudo PERL5OPT Environment Cleaning Multiple Variable Privilege Escalation
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
6	200	over 6 years ago	about 1 year ago	2 times	100%

Timeline

Disclosure Date	Vendor Solution Date
2005-11-10	2005-11-10

Description

Sudo contain a flaw that may allow a malicious user to gain access to unauthorized privileges. The issue is triggered when a user is able to run perl scripts via Sudo, and the perl scripts to not have the taint flag (-T). This flaw may lead to a loss of integrity.

Classification

Location: Local Access Required
Attack Type: Other
Impact: Loss of Integrity
Solution: Workaround, Patch / RCS, Upgrade
Exploit: Exploit Public
Disclosure: OSVDB Verified, Vendor Verified, Vendor Verified, Third-party Verified, Coordinated Disclosure

Technical

An attacker may set the PERLLIB, PERL5LIB, and PERL5OPT environment variables to arbitrary paths, and sudo does not filter them and passes them directly to perl. This results in perl looking at these paths for libraries when running a "use()", "require()", or "do()". This issue is very similar to LD_LIBRARY_PATH attacks.

Solution

Upgrade to version 1.6.8p12 or higher, as it has been reported to fix this vulnerability. An administrator can also apply the following workaround: Add
'Defaults env_delete+="PERLLIB PERL5LIB PERL5OPT"' to
the top of the sudoers file to strip out the offending variables.

Products

Sudo	Sudo	1.6.3p7
		1.6.8p7
		1.3.1p12
		1.5.6
		1.6.4
		1.6.8p8
		1.3.1p14
		1.3.1p13
		1.6.4p1
		1.3.2 BETA
		1.6.4p2
		1.3.3 BETA
		1.3.4 BETA
		1.3.5 BETA
		1.3.1
		1.6.5p2
		1.6.5
		1.3.6 BETA
		1.5.7
		1.6.6
		1.6.5p1
		1.5.8
		1.6.7
		1.3.7 GAMMA
		1.5.8p1
		1.6.7p1
		1.4
		1.5.8p2
		1.6.7p2
		1.4.1
		1.6
		1.6.7p3
		1.4.3
		1.3.1p2
		1.4.2
		1.6.1
		1.6.7p4
		1.3.1p4
		1.4.4
		1.3.1p3
		1.6.2
		1.6.7p5
		1.3.1p5
		1.4.5
		1.6.8
		1.3.1p6
		1.5
		1.3.1p7
		1.5.1
		1.6.3
		1.6.8p2
		1.3.1p8
		1.5.2
		1.6.3p3
		1.6.3p1
		1.6.8p3
		1.6.8p1
		1.5.3
		1.6.3p4
		1.6.3p2
		1.6.8p4
		1.3.1p9
		1.6.3p5
		1.6.8p5
1.3.1p10
1.5.4
1.5.5
1.3.1p11
1.6.8p6
1.6.3p6
1.6.8p9
1.6.8p10
1.6.8p11

References

Security Tracker: 1015192
Bugtraq ID: 15394
Secunia Advisory ID: 17534 18102 18156 18308 18463 18549 18558 18906 19016 21692
SCIP VulDB ID: 1892
CVE ID: 2005-4158 (see also: NVD) 2006-0151 (see also: NVD)
ISS X-Force ID: 23102
Vendor Specific Advisory URL: http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.421822
http://www.trustix.org/errata/2006/0010/
Other Advisory URL: http://www.debian.org/security/2006/dsa-946
http://www.mandriva.com/security/advisories?name=MDKSA-2006:159
http://www.novell.com/linux/security/advisories/2006_02_sr.html
http://www.sudo.ws/sudo/alerts/perl_env.html
http://www.trustix.org/errata/2006/0002/
http://www.ubuntulinux.org/usn/usn-235-1
http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2005:234

Tools & Filters

	20465 20779 20780 20919 22812

Credit

Charles A. Morris - Old Dominion University

CVSSv2 Score

CVSSv2 Base Score = 7.2
Source: nvd.nist.gov | Generated: 2006-01-10 | Disagree? | There are 1 more: View All

Blogs

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