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Advisories

FreeRDP before 3.32.0 Shadow Server Divide-by-Zero via Frame Acknowledge PDU

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severity
high
date
Affecting

  • FreeRDP >= 0, < 3.32.0

CWE
  • CWE-191 Integer Underflow (Wrap or Wraparound)
CVSS
7.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
DavidKorczynski
Description
FreeRDP before 3.32.0 contains a divide-by-zero vulnerability in the freerdp-shadow-cli shadow server: the frame id in a client's Frame Acknowledge PDU is stored without a range check, so the in-flight frame count in shadow_encoder_inflight_frames() can underflow. An authenticated client can acknowledge a frame id one greater than the last frame sent, causing shadow_encoder_create_frame_id() to divide by zero (SIGFPE) and terminate the process, disconnecting all viewers.

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