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Advisories

Rustls 0.23.13 before 0.23.45 TLS 1.3 Handshake Encryption Level Bypass

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Severity
medium
Date
Affecting

  • rustls >= 0.23.13, < 0.23.45

CWE
  • CWE-20 Improper Input Validation
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Credit
randombit
Description
Rustls from 0.23.13 before 0.23.45 accepts TLS 1.3 handshake messages at the wrong encryption level when they follow a key-changing message in the same record, because Deframer::aligned does not enforce RFC 8446 record-boundary alignment. A peer or on-path attacker can pack a plaintext EncryptedExtensions with the ServerHello, which rustls accepts unencrypted.

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