OpenSSL CVE-2024-6119 X.509 Name Check Denial of Service Vulnerability

OpenSSL Security Advisory [3rd September 2024] Possible denial of service in X.509 name checks (CVE-2024-6119) --- Severity: Moderate Issue summary: Applications performing certificate name checks (e.g., TLS clients checking server certificates) may attempt to read an invalid memory address, resulting in abnormal termination of the application process. Impact summary: Abnormal termination of an application can cause a denial of service. Applications performing certificate name checks (e.g., TLS clients checking server certificates) may attempt to read an invalid memory address when comparing the expected name with an 'otherName' subject alternative name of an X.509 certificate. This may result in an exception that terminates the application program. Note: Basic certificate chain validation (signatures, dates, ...) is not affected; the denial of service can occur only when the application also specifies an expected DNS name, Email address, or IP address. TLS servers rarely solicit client certificates, and even when they do, they generally don't perform a name check against a "reference identifier" (expected identity), but rather extract the presented identity after checking the certificate chain. So TLS servers are generally not affected and the severity of the issue is Moderate. The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue. OpenSSL 1.1.1 and 1.0.2 are also not affected by this issue. OpenSSL 3.3, 3.2, 3.1 and 3.0 are vulnerable to this issue. OpenSSL 3.3 users should upgrade to OpenSSL 3.3.2 OpenSSL 3.2 users should upgrade to OpenSSL 3.2.3 OpenSSL 3.1 users should upgrade to OpenSSL 3.1.7 OpenSSL 3.0 users should upgrade to OpenSSL 3.0.15 This issue was reported on 16th June 2024 by David Benjamin (Google), reiterating an AddressSanitizer issue raised on 30th September 2021. The fix was developed by Viktor Dukhovni. --- General Advisory Notes URL for this Security Advisory: https://openssl-library.org/news/secadv/20240903.txt Note: the online version of the advisory may be updated with additional details over time. For details of OpenSSL severity classifications please see: https://openssl-library.org/policies/general/security-policy/

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OpenSSL CVE-2024-6119 X.509 Name Check Denial of Service Vulnerability