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Test ID:1.3.6.1.4.1.25623.1.0.108752
Category:Denial of Service
Title:OpenSSL: Segmentation fault in SSL_check_chain (CVE-2020-1967) (Windows)
Summary:OpenSSL server or client applications are prone to a; denial-of-service vulnerability.
Description:Summary:
OpenSSL server or client applications are prone to a
denial-of-service vulnerability.

Vulnerability Insight:
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.

Vulnerability Impact:
This could be exploited by a malicious peer in a Denial of
Service attack.

Affected Software/OS:
OpenSSL versions 1.1.1d, 1.1.1e, and 1.1.1f.

This issue does not impact OpenSSL versions prior to 1.1.1d.

Solution:
Update OpenSSL to version 1.1.1g or later. See the references for more details.

CVSS Score:
5.0

CVSS Vector:
AV:N/AC:L/Au:N/C:N/I:N/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2020-1967
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=eb563247aef3e83dda7679c43f9649270462e5b1
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440
https://security.netapp.com/advisory/ntap-20200424-0003/
https://www.openssl.org/news/secadv/20200421.txt
https://www.synology.com/security/advisory/Synology_SA_20_05
https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL
https://www.tenable.com/security/tns-2020-03
https://www.tenable.com/security/tns-2020-04
Debian Security Information: DSA-4661 (Google Search)
https://www.debian.org/security/2020/dsa-4661
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/
FreeBSD Security Advisory: FreeBSD-SA-20:11
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc
http://seclists.org/fulldisclosure/2020/May/5
https://security.gentoo.org/glsa/202004-10
http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html
https://github.com/irsl/CVE-2020-1967
https://www.oracle.com/security-alerts/cpujul2020.html
http://www.openwall.com/lists/oss-security/2020/04/22/2
https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345@%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee@%3Cdev.tomcat.apache.org%3E
https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064@%3Cdev.tomcat.apache.org%3E
SuSE Security Announcement: openSUSE-SU-2020:0933 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html
SuSE Security Announcement: openSUSE-SU-2020:0945 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html
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