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Advisories

FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response

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severity
medium
date
Affecting

  • FreeRDP >= 3.0.0, < 3.32.0

CWE
  • CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
CVSS
6.0
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
DavidKorczynski
Description
The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-middle can select RDSTLS to override /sec:nla pinning, complete authentication with an all-zero cookie, and receive the user's cleartext password in the Client Info PDU.

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