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Advisories

libschrift through 0.10.2 Divide by Zero via unitsPerEm in draw_line

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Severity
medium
Date
Affecting

  • libschrift <= 0.10.2

CWE
  • CWE-369 Divide By Zero
CVSS
6.8
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
WTCYJ, HaiND from the Post and Telecommunication Institute of Technology
Description
libschrift through 0.10.2 contains a divide by zero vulnerability that allows attackers to crash applications by supplying a font with unitsPerEm of 0 in the head table. Attackers can provide a crafted TrueType font whose NaN glyph coordinates bypass clip_points(), causing an out-of-bounds raster read in draw_line() during sft_render() and crashing the process.

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