Vulnerabilities 3.4

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Show issues fixed only in OpenSSL 3.4, 3.3, 3.2, 3.1, 3.0, 1.1.1, 1.1.0, 1.0.2, 1.0.1, 1.0.0, 0.9.8, 0.9.7, 0.9.6, or all versions.

CVE-2024-13176

Severity
Low
Published at
20 January 2025
Title
Timing side-channel in ECDSA signature computation
Found by
George Pantelakis (Red Hat)
Fix developed by
Tomáš Mráz
Affected
  • from 3.4.0 before 3.4.1
  • from 3.3.0 before 3.3.3
  • from 3.2.0 before 3.2.4
  • from 3.1.0 before 3.1.8
  • from 3.0.0 before 3.0.16
  • from 1.1.1 before 1.1.1zb
  • from 1.0.2 before 1.0.2zl
References

Issue summary: A timing side-channel which could potentially allow recovering the private key exists in the ECDSA signature computation.

Impact summary: A timing side-channel in ECDSA signature computations could allow recovering the private key by an attacker. However, measuring the timing would require either local access to the signing application or a very fast network connection with low latency.

There is a timing signal of around 300 nanoseconds when the top word of the inverted ECDSA nonce value is zero. This can happen with significant probability only for some of the supported elliptic curves. In particular the NIST P-521 curve is affected. To be able to measure this leak, the attacker process must either be located in the same physical computer or must have a very fast network connection with low latency. For that reason the severity of this vulnerability is Low.

CVE-2024-12797

Severity
High
Published at
11 February 2025
Title
RFC7250 handshakes with unauthenticated servers don't abort as expected
Found by
Apple Inc.
Fix developed by
Viktor Dukhovni
Affected
  • from 3.4.0 before 3.4.1
  • from 3.3.0 before 3.3.3
  • from 3.2.0 before 3.2.4
References

Issue summary: Clients using RFC7250 Raw Public Keys (RPKs) to authenticate a server may fail to notice that the server was not authenticated, because handshakes don’t abort as expected when the SSL_VERIFY_PEER verification mode is set.

Impact summary: TLS and DTLS connections using raw public keys may be vulnerable to man-in-middle attacks when server authentication failure is not detected by clients.

RPKs are disabled by default in both TLS clients and TLS servers. The issue only arises when TLS clients explicitly enable RPK use by the server, and the server, likewise, enables sending of an RPK instead of an X.509 certificate chain. The affected clients are those that then rely on the handshake to fail when the server’s RPK fails to match one of the expected public keys, by setting the verification mode to SSL_VERIFY_PEER.

Clients that enable server-side raw public keys can still find out that raw public key verification failed by calling SSL_get_verify_result(), and those that do, and take appropriate action, are not affected. This issue was introduced in the initial implementation of RPK support in OpenSSL 3.2.

The FIPS modules in 3.4, 3.3, 3.2, 3.1 and 3.0 are not affected by this issue.