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Rewterz Threat Advisory – CVE-2020-1967 – OpenSSL Segmentation fault in SSL_check_chain Vulnerability

Severity

High

Analysis Summary

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 unrecognized signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack.

Impact

Denial of Service

Affected Vendors

OpenSSL

Affected Products

  • OpenSSL version 1.1.1d
  • OpenSSL version 1.1.1e
  • OpenSSL version 1.1.1f

Remediation

OpenSSL 1.1.1 users should upgrade to 1.1.1g