Bug 794763 - glibc: F_S format string protection bypass via "nargs" integer overflow
glibc: F_S format string protection bypass via "nargs" integer overflow
Status: CLOSED DUPLICATE of bug 794766
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20101117,repor...
: Security
Depends On:
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Reported: 2012-02-17 10:08 EST by Stefan Cornelius
Modified: 2016-03-04 07:56 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2012-02-17 10:48:02 EST
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Description Stefan Cornelius 2012-02-17 10:08:05 EST
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 10:48:02 EST

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

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