CVE-2020-1967 Detail

Current 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).


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  7.5 HIGH
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H


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Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html
http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html
http://seclists.org/fulldisclosure/2020/May/5
http://www.openwall.com/lists/oss-security/2020/04/22/2 Mailing List  Third Party Advisory 
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=eb563247aef3e83dda7679c43f9649270462e5b1 Mailing List  Patch  Vendor Advisory 
https://github.com/irsl/CVE-2020-1967
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440 Third Party Advisory 
https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345@%3Cdev.tomcat.apache.org%3E Mailing List  Third Party Advisory 
https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064@%3Cdev.tomcat.apache.org%3E Mailing List  Third Party Advisory 
https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee@%3Cdev.tomcat.apache.org%3E Mailing List  Third Party Advisory 
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/ Mailing List  Third Party Advisory 
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/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO/ Mailing List  Third Party Advisory 
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc Patch  Third Party Advisory 
https://security.gentoo.org/glsa/202004-10 Patch  Third Party Advisory 
https://security.netapp.com/advisory/ntap-20200424-0003/ Third Party Advisory 
https://security.netapp.com/advisory/ntap-20200717-0004/
https://www.debian.org/security/2020/dsa-4661 Third Party Advisory 
https://www.openssl.org/news/secadv/20200421.txt Vendor Advisory 
https://www.oracle.com/security-alerts/cpujul2020.html
https://www.synology.com/security/advisory/Synology_SA_20_05
https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL Third Party Advisory 
https://www.tenable.com/security/tns-2020-03 Third Party Advisory 
https://www.tenable.com/security/tns-2020-04

Weakness Enumeration

CWE-ID CWE Name Source
CWE-476 NULL Pointer Dereference cwe source acceptance level NIST  

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Change History

24 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-1967
NVD Published Date:
04/21/2020
NVD Last Modified:
07/17/2020
Source:
MITRE