Bug 833704 (CVE-2012-3405)

Summary:	CVE-2012-3405 glibc: incorrect use of extend_alloca() in formatted printing can lead to FORTIFY_SOURCE format string protection bypass
Product:	[Other] Security Response	Reporter:	Stefan Cornelius <scorneli>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fweimer, law, mfranc, mjc, security-response-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-07-18 16:38:54 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:	841318
Bug Blocks:	822803

Description Stefan Cornelius 2012-06-20 07:29:48 UTC

It was discovered that the formatted printing functionality in glibc used extend_alloca() incorrectly. A remote attacker could provide a specially crafted sequence of format specifiers, leading to a desynchronization within the buffer size handling, resulting in the use of uninitialized memory or, potentially, FORTIFY_SOURCE format string protection mechanism bypass, when processed.

References:
http://sourceware.org/bugzilla/show_bug.cgi?id=13446
http://sourceware.org/git/?p=glibc.git;a=commitdiff;h=a4647e727a2a52e1259474c13f4b13288938bed4

Comment 1 Stefan Cornelius 2012-07-11 10:35:07 UTC

Pulic now/CVEs requested via:
http://www.openwall.com/lists/oss-security/2012/07/11/5

Comment 2 Stefan Cornelius 2012-07-11 17:25:57 UTC

A CVE identifier of CVE-2012-3405 has been assigned to this issue.

Comment 3 errata-xmlrpc 2012-07-18 15:24:05 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:1098 https://rhn.redhat.com/errata/RHSA-2012-1098.html

Comment 4 Vincent Danen 2012-07-18 16:38:54 UTC

Statement:

This issue did not affect the version of glibc as shipped with Red Hat Enterprise Linux 5.

Comment 5 Vincent Danen 2012-07-18 16:39:58 UTC

Created glibc tracking bugs for this issue

Affects: fedora-all [bug 841318]

Comment 6 errata-xmlrpc 2012-08-23 14:25:39 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2012:1200 https://rhn.redhat.com/errata/RHSA-2012-1200.html