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Advisories

rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHello

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Severity
medium
Date
Affecting

  • rustls >= 0, < 0.23.46

CWE
  • CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
Adam010341
Description
rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to send only classical shares and lose post-quantum confidentiality.

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