April 26, 2020

Segmentation fault in SSL_check_chain (CVE-2020-1967)

OpenSSL Security Advisory [21 April 2020]


Segmentation fault in SSL_check_chain (CVE-2020-1967)

===================================================== Severity: High 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. Affected OpenSSL 1.1.1 users should upgrade to 1.1.1g This issue was found by Bernd Edlinger and reported to OpenSSL on 7th April 2020. It was found using the new static analysis pass being implemented in GCC, -fanalyzer. Additional analysis was performed by Matt Caswell and Benjamin Kaduk.

Note =====

This issue did not affect OpenSSL 1.0.2 however these versions are out of support and no longer receiving public updates. Extended support is available for premium support customers: https://www.openssl.org/support/contracts.html This issue did not affect OpenSSL 1.1.0 however these versions are out of support and no longer receiving updates. Users of these versions should upgrade to OpenSSL 1.1.1.

References ==========

URL for this Security Advisory: https://www.openssl.org/news/secadv/20200421.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://www.openssl.org/policies/secpolicy.html