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Advisories

rustls 0.23.44 and 0.23.45 ECH Rejection Application Data Disclosure

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Severity
medium
Date
Affecting

  • rustls >= 0.23.44, < 0.23.46

CWE
  • CWE-696 Incorrect Behavior Order
CVSS
4.6
CVSS V4 Vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Description
rustls 0.23.44 and 0.23.45 contain an information disclosure vulnerability that sends application data buffered before the handshake completes to the client-facing server when Encrypted Client Hello is rejected. Because start_traffic() queues plaintext from ClientConnection::writer() before sending the ech_required alert, the authenticated public_name server receives data intended for the inner server.

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