CVE-2020-1967

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 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

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=eb563247aef3e83dda7679c43f9649270462e5b1

https://www.openssl.org/news/secadv/20200421.txt

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc

https://www.debian.org/security/2020/dsa-4661

http://www.openwall.com/lists/oss-security/2020/04/22/2

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440

https://lists.apache.org/thread.html/[email protected]%3Cdev.tomcat.apache.org%3E

https://security.gentoo.org/glsa/202004-10

https://security.netapp.com/advisory/ntap-20200424-0003/

https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL

https://lists.fedoraproject.org/archives/list/[email protected]/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/

https://www.tenable.com/security/tns-2020-03

https://lists.fedoraproject.org/archives/list/[email protected]/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/

https://github.com/irsl/CVE-2020-1967

http://seclists.org/fulldisclosure/2020/May/5

http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/

https://www.synology.com/security/advisory/Synology_SA_20_05

https://www.tenable.com/security/tns-2020-04

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html

https://www.oracle.com/security-alerts/cpujul2020.html

https://security.netapp.com/advisory/ntap-20200717-0004/

https://www.oracle.com/security-alerts/cpuoct2020.html

https://www.tenable.com/security/tns-2020-11

https://www.oracle.com/security-alerts/cpujan2021.html

https://www.tenable.com/security/tns-2021-10

https://www.oracle.com/security-alerts/cpuApr2021.html

https://www.oracle.com//security-alerts/cpujul2021.html

https://www.oracle.com/security-alerts/cpuoct2021.html

Details

Risk Information

CVSS v2

CVSS v3