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Secunia Security Advisory 47064

Secunia Security Advisory 47064
Posted Dec 6, 2011
Authored by Secunia | Site secunia.com

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.

tags | advisory
MD5 | a53d76d8d10fe71f7b9af5e267d8aa6b

Secunia Security Advisory 47064

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TITLE:
GNU C Library "__tzfile_read()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA47064

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47064/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47064

RELEASE DATE:
2011-12-06

DISCUSS ADVISORY:
http://secunia.com/advisories/47064/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
* Last Update
* Popularity
* Comments
* Criticality Level
* Impact
* Where
* Solution Status
* Operating System / Software
* CVE Reference(s)

http://secunia.com/advisories/47064/

ONLY AVAILABLE IN CUSTOMER AREA:
* Authentication Level
* Report Reliability
* Secunia PoC
* Secunia Analysis
* Systems Affected
* Approve Distribution
* Remediation Status
* Secunia CVSS Score
* CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=47064

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
* AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

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:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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