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CVE-2017-7890

The GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.31 and 7.x before 7.1.7, doe…

Impact

The GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.31 and 7.x before 7.1.7, does not zero colorMap arrays before use. A specially crafted GIF image could use the uninitialized tables to read ~700 bytes from the top of the stack, potentially disclosing sensitive information.

Affected products

VendorProductAffected versions
PhpPhp
through 5.6.30
Versions 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4

Weakness classification

CWE-200

References