Date: Thu, 23 Feb 2017 21:18:17 -0600 (CST) From: Bob Friesenhahn <bfriesen@...ple.dallas.tx.us> To: oss-security@...ts.openwall.com Subject: GraphicsMagick heap out of bounds write issue GraphicsMagick versions up to 1.3.25 encounter a write beyond an allocated heap buffer when reading CMYKA TIFF files which claim to offer fewer samples per pixel than required. This is the tiffinfo description of the problematic TIFF file: TIFF Directory at offset 0x808 (2056) Image Width: 34 Image Length: 48 Bits/Sample: 8 Sample Format: unsigned integer Compression Scheme: None Photometric Interpretation: separated Extra Samples: 1<unassoc-alpha> Orientation: row 0 top, col 0 lhs Samples/Pixel: 2 Rows/Strip: 32 Planar Configuration: single image plane The fix for this is Mercurial changeset 14998:6156b4c2992d which may be viewed at SourceForge via this link: https://sourceforge.net/p/graphicsmagick/code/ci/6156b4c2992d855ece6079653b3b93c3229fc4b8/ A minimal patch to correct the problem is attached. This issue was reported to us on February 15, 2017 by Valon Chu. Bob -- Bob Friesenhahn bfriesen@...ple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ View attachment "tiff.c.patch" of type "text/plain" (1074 bytes)
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