Bug 794763

Summary:	glibc: F_S format string protection bypass via "nargs" integer overflow
Product:	[Other] Security Response	Reporter:	Stefan Cornelius <scorneli>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED DUPLICATE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fweimer
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2012-02-17 15:48:02 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Stefan Cornelius 2012-02-17 15:08:05 UTC

In the Phrack article "A Eulogy for Format Strings", a researcher using nickname "Captain Planet" reported an integer overflow flaw in the format string protection mechanism offered by FORTIFY_SOURCE. A remote attacker could provide a specially crafted executable, leading to FORTIFY_SOURCE format string protection mechanism bypass, when executed.

References:
http://www.phrack.org/issues.html?issue=67&id=9#article

Upstream bug and Kees Cook's proposed patches:
  http://sourceware.org/bugzilla/show_bug.cgi?id=13656
  http://sourceware.org/ml/libc-alpha/2012-02/msg00023.html
  http://sourceware.org/ml/libc-alpha/2012-02/msg00012.html
  http://sourceware.org/ml/libc-alpha/2012-02/msg00073.html

Comment 1 Stefan Cornelius 2012-02-17 15:48:02 UTC


*** This bug has been marked as a duplicate of bug 794766 ***