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Advisories

Ghostscript before 10.08.0 -dSAFER Bypass via .putgstringcopy .forceput Recovery

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Severity
high
Date
Affecting

  • ghostpdl >= 0, < 10.08.0

CWE
  • CWE-648 Incorrect Use of Privileged APIs
CVSS
8.5
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Paulos Yibelo and pwn.ai, Ken Sharp
Description
Ghostscript before 10.08.0 contains a -dSAFER bypass vulnerability in the .putgstringcopy procedure in gs_fonts.ps, which calls the privileged .forceput operator without checking operand types. Attackers can supply crafted PostScript or PDF documents that trigger a type error, recover .forceput via a custom error handler, and cause a use-after-free across save/restore to execute arbitrary code.

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