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Advisories

libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF

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Severity
medium
Date
Affecting

  • libsixel >= 0, < 1.8.7-r1

  • libsixel >= 1.9.0, <= 1.10.5

CWE
  • CWE-787 Out-of-bounds Write
CVSS
5.8
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
ShangzhiXu, HaiND from the Post and Telecommunication Institute of Technology
Description
libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 contains a heap out-of-bounds write vulnerability in gif_init_frame() in src/fromgif.c, which never checks the GIF transparent color index against the palette size. Attackers can supply a crafted GIF with a small color table and large transparent index, processed with a background color set, to write bytes past the palette buffer, causing heap corruption or crashes.

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