SSL: OpenSSL SSL_check_chain NULL Pointer Dereference

This signature detects attempts to exploit a known vulnerability against OpenSSL. A successful attack can result in a denial-of-service condition.

Extended Description

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).

Affected Products

Tenable log_correlation_engine

References

CVE: CVE-2020-1967

Short Name

SSL:OPENSSL-CHK-CHAIN-NPTR-DOS

Severity

Major

Recommended

False

Recommended Action

Drop

SSL: OpenSSL SSL_check_chain NULL Pointer Dereference

Extended Description

Affected Products

References

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