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TITLE:
ytnef Buffer Overflow and Arbitrary File Overwrite Vulnerabilities

SECUNIA ADVISORY ID:
SA36624

VERIFY ADVISORY:
http://secunia.com/advisories/36624/

DESCRIPTION:
Two vulnerabilities have been reported in ytnef, which can be
exploited by malicious people to compromise a user's system.

1) A boundary error within the "ProcessTNEF()" function can be
exploited to cause a stack-based buffer overflow via a specially
crafted TNEF attachment.

Successful exploitation may allow execution of arbitrary code.

2) An input sanitation error when processing TNEF entries can be
exploited to overwrite arbitrary files when a specially crafted TNEF
attachment containing directory traversal sequences is opened.

The vulnerabilities are reported in version 2.6. Other versions may
also be affected.

SOLUTION:
Use another product.

PROVIDED AND/OR DISCOVERED BY:
Yorick Koster, reported via oCERT

ORIGINAL ADVISORY:
Yorick Koster:
http://www.akitasecurity.nl/advisory.php?id=AK20090601

oCERT:
http://www.ocert.org/advisories/ocert-2009-013.html

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