FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

OpenSSL remote denial of service vulnerability

Affected packages
12.1	<=	FreeBSD	<	12.1_4
1.1.1,1	<=	openssl	<	1.1.1g,1

Details

VuXML ID	012809ce-83f3-11ea-92ab-00163e433440
Discovery	2020-04-21
Entry	2020-04-21
Modified	2020-04-22

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.

References

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