Bug 1071780 (CVE-2014-0106)

Summary:	CVE-2014-0106 sudo: certain environment variables not sanitized when env_reset is disabled
Product:	[Other] Security Response	Reporter:	Murray McAllister <mmcallis>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dkopecek, jkurik, jrusnack, security-response-team, vdanen
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	sudo 1.8.5	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-03-10 16:04:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1072210, 1072211
Bug Blocks:	1071787

Description Murray McAllister 2014-03-03 07:24:42 UTC

It was found that, when the Sudo env_reset option was disabled (it is enabled by default), certain environment variables were not blacklisted as expected. A local user authorized to run commands using sudo could use this flaw to execute arbitrary code, allowing them to escalate their privileges.

This issue affects Sudo versions 1.6.9 to 1.8.4p5. Versions 1.8.5 and later are not affected.

Acknowledgements:

Red Hat would like to thank Todd C. Miller for reporting this issue. Upstream acknowledges Sebastien Macke as the original reporter.

Comment 5 Huzaifa S. Sidhpurwala 2014-03-05 04:32:57 UTC

The "env_reset" option is enabled in the version of sudo as shipped with Red Hat Enterprise Linux 5, therefore this flaw does not affect the default configurations of the package.


Statement:

This issue did not affect the version of sudo package as shipped with Red Hat Enterprise Linux 6.

Comment 6 Huzaifa S. Sidhpurwala 2014-03-05 04:35:20 UTC

This issue does not affect the version of sudo as shipped with Fedora 19 and Fedora 20.

Comment 7 Murray McAllister 2014-03-06 03:46:37 UTC

Public now:

http://seclists.org/oss-sec/2014/q1/510

Upstream fix: http://www.sudo.ws/repos/sudo/rev/748cefb49422

Comment 8 Murray McAllister 2014-03-06 03:48:00 UTC

External References:

http://www.sudo.ws/sudo/alerts/env_add.html

Comment 9 Martin Prpič 2014-03-06 17:02:30 UTC

Note: This issue only has a security impact on configurations in which a user is permitted to run a limited number of commands with elevated privileges (for example, only commands to start/stop/restart a service). This issue has no impact on configurations in which users are permitted to run arbitrary commands with a target user's privileges.

Comment 10 errata-xmlrpc 2014-03-10 15:46:54 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:0266 https://rhn.redhat.com/errata/RHSA-2014-0266.html