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Posted to issues@commons.apache.org by "Rody Kersten (JIRA)" <ji...@apache.org> on 2017/08/15 21:28:00 UTC

[jira] [Created] (IMAGING-203) JPEG segment size not validated

Rody Kersten created IMAGING-203:
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             Summary: JPEG segment size not validated
                 Key: IMAGING-203
                 URL: https://issues.apache.org/jira/browse/IMAGING-203
             Project: Commons Imaging
          Issue Type: Bug
          Components: Format: JPEG
            Reporter: Rody Kersten


Using my AFL-based fuzzer for Java, Kelinci (https://github.com/isstac/kelinci) I found that a NegativeArraySizeException may be throw when attempting to read an invalid JPEG image.

Each JPEG segment starts with a two-byte unsigned integer specifying the segment size. Segments are parsed by org.apache.commons.imaging.formats.jpeg.JpegUtils.traverseJFIF(). As the specified size includes these two bytes, the method subtracts 2 from the size before it is used. It then attempts to allocate a buffer for the segment, which fails if the specified size is 0 or 1. The method should throw an ImageReadException instead.





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