CVE-2020-1967
Segmentation fault in SSL_check_chain
- State
- Published
- Severity
- Not scored
- Published
- Apr 21, 2020
- Updated
- Oct 8, 2026
- Reserved
- Dec 3, 2019
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).
Scores
The record has no CVSS score.
Weaknesses
The record names no weakness.
Affected Products
| Product | Versions |
|---|---|
OpenSSLOpenSSL |
|
References
- FreeBSD-SA-20:11vendor-advisory
- DSA-4661vendor-advisory
- [oss-security] 20200422 [CVE-2020-1967] OpenSSL 1.1.1d+ Segmentation fault in SSL_check_chainmailing-list
- [tomcat-dev] 20200422 Time for Tomcat Native 1.2.24?mailing-list
- [tomcat-dev] 20200422 Re: Time for Tomcat Native 1.2.24?mailing-list
- [tomcat-dev] 20200423 Re: Time for Tomcat Native 1.2.24?mailing-list
- GLSA-202004-10vendor-advisory
- FEDORA-2020-fcc91a28e8vendor-advisory
- FEDORA-2020-da2d1ef2d7vendor-advisory
- 20200501 CVE-2020-1967: proving sigalg != NULLmailing-list
- FEDORA-2020-d7b29838f6vendor-advisory
- openSUSE-SU-2020:0933vendor-advisory
- openSUSE-SU-2020:0945vendor-advisory
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.tenable.com/security/tns-2020-03
- https://www.openssl.org/news/secadv/20200421.txt
- https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1
- https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440
- https://security.netapp.com/advisory/ntap-20200424-0003/
- https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL
- https://github.com/irsl/CVE-2020-1967
- http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html
- https://www.synology.com/security/advisory/Synology_SA_20_05
- https://www.tenable.com/security/tns-2020-04
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://security.netapp.com/advisory/ntap-20200717-0004/
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.tenable.com/security/tns-2020-11
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.tenable.com/security/tns-2021-10
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
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