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From: "kees at outflux dot net" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sources.redhat.com
Subject: [Bug libc/13656] New: vfprintf nargs integer overflow
Date: Thu, 02 Feb 2012 20:52:00 -0000
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http://sourceware.org/bugzilla/show_bug.cgi?id=13656

             Bug #: 13656
           Summary: vfprintf nargs integer overflow
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper.fsp@gmail.com
        ReportedBy: kees@outflux.net
    Classification: Unclassified


The nargs value can overflow when doing allocations, and argument-based offsets
are not bounds-checked, allowing arbitrary memory writes via format strings,
bypassing _FORTIFY_SOURCE protections:

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

Patch in progress:
http://cygwin.com/ml/libc-alpha/2012-02/msg00016.html

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