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TITLE:
LibTIFF Two Buffer Overflow Vulnerabilities

SECUNIA ADVISORY ID:
SA43593

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/43593/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=43593

RELEASE DATE:
2011-03-23

DISCUSS ADVISORY:
http://secunia.com/advisories/43593/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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http://secunia.com/advisories/43593/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=43593

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DESCRIPTION:
Two vulnerabilities have been reported in LibTIFF, which can be
exploited by malicious people to potentially compromise an
application using the library.

1) A boundary error within the "EXPAND2D()" macro in
libtiff/tif_fax3.h when decoding CCITT Group 4 compressed TIFF images
can be exploited to cause a heap-based buffer overflow via specially
crafted TIFF images.

Successful exploitation may allow execution of arbitrary code.

2) A boundary error within the ThunderScan decoder when processing
images with an incorrect number of bitspersample can be exploited to
cause a heap-based buffer overflow via specially crafted ThunderScan
encoded files.

The vulnerabilities are reported in version 3.9.4. Other versions may
also be affected.

SOLUTION:
Fixed in the CVS repository.

PROVIDED AND/OR DISCOVERED BY:
1) Apple Product Security
2) Martin Barbella via ZDI.

ORIGINAL ADVISORY:
APPLE-SA-2011-03-02-1:
http://lists.apple.com/archives/security-announce/2011/Mar/msg00000.html

LibTIFF:
http://bugzilla.maptools.org/show_bug.cgi?id=2300

ZDI-11-107:
http://www.zerodayinitiative.com/advisories/ZDI-11-107/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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