Null pointer deference in openssl-src
High severity
GitHub Reviewed
Published
Aug 25, 2021
to the GitHub Advisory Database
•
Updated Jun 16, 2023
Description
Published by the National Vulnerability Database
Apr 21, 2020
Reviewed
Aug 19, 2021
Published to the GitHub Advisory Database
Aug 25, 2021
Last updated
Jun 16, 2023
Credits
-
another-rex Analyst
-
andrewpollock Analyst
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).
References