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Advisories

FreeRDP before 3.32.2 Shadow Server CPU Exhaustion via Zero-Length DVC DATA

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Severity
high
Date
Affecting

  • FreeRDP >= 0, < 3.32.2

CWE
  • CWE-400 Uncontrolled Resource Consumption
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
Kushalkhemka, mayank-jangid-moon, skigeek16, opensec-intelligence
Description
FreeRDP before 3.32.2 contains a denial of service vulnerability in the shadow server that allows authenticated RDP clients to spin server threads by sending zero-length drdynvc DATA PDUs. Attackers can send empty DATA messages on opened audin or rdpgfx channels, so that FreeRDP_WTSVirtualChannelRead never consumes them, consuming full CPU cores until disconnect.

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