RFC7250 handshakes with unauthenticated servers don't abort as expected (OpenSSL OpenSSL)

CVE-2024-12797
MEDIUM 6.3

At a glance

Source
NVD
EPSS
EPSS 2.53 % · percentile 85 ()
State
PUBLISHED
Published
Updated
Assigner
openssl
NVD status
Deferred

Description

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.

Weaknesses (CWE)

  • CWE-392 — Missing Report of Error Condition

References

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 6.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:LCISA-ADP
CVSS 3.1MEDIUM 6.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:LNVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Advisories

European references

CERT-FR advisories

Affected products

ProductVersions
OpenSSL · OpenSSLaffected 3.4.0 < 3.4.1 ; affected 3.3.0 < 3.3.3 ; affected 3.2.0 < 3.2.4

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD