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VuXML IDDescription
012809ce-83f3-11ea-92ab-00163e433440OpenSSL remote denial of service vulnerability

Problem 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 unrecognized signature algorithm is received from the peer.

Impact:

A malicious peer could exploit the NULL pointer dereference crash, causing a denial of service attack.


Discovery 2020-04-21
Entry 2020-04-21
Modified 2020-04-22
FreeBSD
ge 12.1 lt 12.1_4

openssl
ge 1.1.1,1 lt 1.1.1g,1

CVE-2020-1967
SA-20:11.openssl
https://www.openssl.org/news/secadv/20200421.txt