Secunia Security Advisory - A vulnerability has been discovered in the GNU C Library, which potentially can be exploited by malicious users to compromise a vulnerable system.
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TITLE:
GNU C Library "__tzfile_read()" Buffer Overflow Vulnerability
SECUNIA ADVISORY ID:
SA47064
VERIFY ADVISORY:
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http://secunia.com/advisories/47064/
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RELEASE DATE:
2011-12-06
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http://secunia.com/advisories/47064/
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DESCRIPTION:
A vulnerability has been discovered in the GNU C Library, which
potentially can be exploited by malicious users to compromise a
vulnerable system.
The vulnerability is caused due to an error within the
"__tzfile_read()" function (time/tzfile.c) and can be exploited to
cause a heap-based buffer overflow via a specially crafted timezone
file.
Successful exploitation may allow the execution of arbitrary code but
requires that a malicious timezone file is loaded (e.g. by uploading
it into the chroot of an FTP server).
The vulnerability is confirmed in version 2.14.1. Other versions may
also be affected.
SOLUTION:
Restrict access to trusted users only.
PROVIDED AND/OR DISCOVERED BY:
dividead
Additional information about the attack vector provided by Kingcope.
ORIGINAL ADVISORY:
Dividead:
http://dividead.wordpress.com/2009/06/01/glibc-timezone-integer-overflow/
Kingcope:
http://archives.neohapsis.com/archives/fulldisclosure/2011-12/0059.html
OTHER REFERENCES:
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DEEP LINKS:
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EXTENDED DESCRIPTION:
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EXTENDED SOLUTION:
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EXPLOIT:
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