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>> LibTIFF Image Handling Multiple Command Execution and Denial of Service Vulnerabilities
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Multiple vulnerabilities have been identified in LibTIFF, which could be exploited by attackers to execute arbitrary commands or cause a denial of service.
The first issue is due to a stack overflow error in the "TIFFFetchShortPair()" [tif_dirread.c] function when handling a malformed "DotRange", "YCbCrSubsampling", "HalftoneHints", or "PageNumber" tag, which could be exploited by attackers to compromise a vulnerable system via a malicious image.
The second flaw is due to a heap overflow error in the "TIFFScanLineSize()" and "TIFFReadScanline()" [tiff_jpeg.c] functions, which could be exploited by attackers to execute arbitrary commands.
The third vulnerability is due to a heap overflow error in the PixarLog decoder, which could be exploited by attackers to execute arbitrary code.
The fourth issue is due to a heap overflow error in the NeXT RLE decoder, which could be exploited by attackers to compromise a vulnerable system.
The fifth flaw is due to an infinite loop in the "EstimateStripByteCounts()" function, which could be exploited by attackers to cause a denial of service.
The sixth issue is due to various unchecked arithmetic operations, which could be exploited by attackers to bypass security restrictions and cause a denial of service.
The seventh vulnerability is due to errors in the custom tag support, which could be exploited by attackers to bypass security checks, cause a denial of service, or execute arbitrary commands.
Affected Products
LibTIFF version 3.8.2 and prior
Solution
VUPEN Security is not aware of any vendor-supplied patch.
References
http://www.vupen.com/english/advisories/2006/3105
http://bugs.gentoo.org/show_bug.cgi?id=142383
Credits
Vulnerabilities reported by Tavis Ormandy (Google Security Team)
ChangeLog
2006-08-02 : Initial release
Vulnerability Management
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