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).
lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html
lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html
packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html
seclists.org/fulldisclosure/2020/May/5
www.openwall.com/lists/oss-security/2020/04/22/2
git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=eb563247aef3e83dda7679c43f9649270462e5b1
github.com/irsl/CVE-2020-1967
kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440
lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064@%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee@%3Cdev.tomcat.apache.org%3E
lists.fedoraproject.org/archives/list/[email protected]/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY
lists.fedoraproject.org/archives/list/[email protected]/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD
lists.fedoraproject.org/archives/list/[email protected]/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO
nvd.nist.gov/vuln/detail/CVE-2020-1967
rustsec.org/advisories/RUSTSEC-2020-0015.html
security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc
security.gentoo.org/glsa/202004-10
security.netapp.com/advisory/ntap-20200424-0003
security.netapp.com/advisory/ntap-20200717-0004
www.debian.org/security/2020/dsa-4661
www.openssl.org/news/secadv/20200421.txt
www.oracle.com//security-alerts/cpujul2021.html
www.oracle.com/security-alerts/cpuApr2021.html
www.oracle.com/security-alerts/cpujan2021.html
www.oracle.com/security-alerts/cpujul2020.html
www.oracle.com/security-alerts/cpuoct2020.html
www.oracle.com/security-alerts/cpuoct2021.html
www.synology.com/security/advisory/Synology_SA_20_05
www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL
www.tenable.com/security/tns-2020-03
www.tenable.com/security/tns-2020-04
www.tenable.com/security/tns-2020-11
www.tenable.com/security/tns-2021-10