Bug 949753 (CVE-2013-2777)

Summary:	CVE-2013-2777 sudo: bypass of tty_tickets constraints
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	dkopecek, kzak
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	sudo 1.8.6p6, sudo 1.7.10p5	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-11-22 05:36:55 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:	1015355
Bug Blocks:	916366, 974906

Description Vincent Danen 2013-04-08 22:42:42 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2013-2777 to
the following vulnerability:

Name: CVE-2013-2777
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-2777
Assigned: 20130408
Reference: http://www.openwall.com/lists/oss-security/2013/02/27/31
Reference: https://bugzilla.redhat.com/show_bug.cgi?id=916365
Reference: http://www.sudo.ws/repos/sudo/rev/2f3225a2a4a4
Reference: http://www.sudo.ws/repos/sudo/rev/bfa23f089bba
Reference: http://www.sudo.ws/sudo/alerts/tty_tickets.html
Reference: http://www.securityfocus.com/bid/58207

sudo before 1.7.10p5 and 1.8.x before 1.8.6p6, when the tty_tickets
option is enabled, does not properly validate the controlling terminal
device, which allows local users with sudo permissions to hijack the
authorization of another terminal via vectors related to a session
without a controlling terminal device and connecting to a standard
input, output, and error file descriptors of another terminal.  NOTE:
this is one of three closely-related vulnerabilities that were
originally assigned CVE-2013-1776, but they have been SPLIT because of
different affected versions.

Comment 2 Huzaifa S. Sidhpurwala 2013-09-26 09:53:39 UTC

Looking at the upstream commits, it seems that this flaw exists because of incomplete/insufficient fix applied for the CVE-2013-1776 flaw.

Since the patch for CVE-2013-1776 was not backported to Red Hat Enterprise Linux 5, this flaw does not affect it

Comment 5 Tomas Hoger 2013-10-09 21:11:47 UTC

(In reply to Huzaifa S. Sidhpurwala from comment #2)
> Looking at the upstream commits, it seems that this flaw exists because of
> incomplete/insufficient fix applied for the CVE-2013-1776 flaw.

Hence this CVE affects versions starting with 1.7.10 and 1.8.5 and is corrected in versions 1.7.10p5 and 1.8.6p6.

Comment 6 errata-xmlrpc 2013-11-21 23:12:53 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:1701 https://rhn.redhat.com/errata/RHSA-2013-1701.html