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Advisories

FreeRDP before 3.32.0 Out-of-Bounds Write via MS-RDPEGT Video Geometry

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severity
medium
date
Affecting

  • FreeRDP >= 0, < 3.32.0

CWE
  • CWE-129 Improper Validation of Array Index
CVSS
6.0
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
DavidKorczynski
Description
FreeRDP before 3.32.0 stores the server-supplied signed MS-RDPEGT geometry origin unchecked in an unsigned video surface coordinate, so the blit clamp in gdiVideoShowSurface() wraps in 32-bit arithmetic and is skipped. A malicious RDP server can send a negative topLevelLeft to clients connecting with /video, causing an out-of-bounds write of decoded H.264 picture data or a client abort.

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