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).
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 1.1.1.g-1 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 1.1.1g-1 |
| sid | Fixed | 1.1.1g-1 |
| forky | Fixed | 1.1.1g-1 |
| bullseye | Fixed | 1.1.1g-1 |
| bookworm | Fixed | 1.1.1g-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| crates.io | openssl-src | | |
| crates.io | openssl-src | >=111.6.0,<111.9.0 | 111.9.0 |
References
- https://www.openssl.org/news/secadv/20200421.txt
- https://security.archlinux.org/ASA-202004-19
- https://security.archlinux.org/ASA-202004-18
- https://www.suse.com/security/cve/CVE-2020-1967.html
- https://nvd.nist.gov/vuln/detail/CVE-2020-1967
- https://www.tenable.com/security/tns-2021-10
- https://www.tenable.com/security/tns-2020-11
- https://www.tenable.com/security/tns-2020-04
- https://www.tenable.com/security/tns-2020-03
- https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL
- https://www.synology.com/security/advisory/Synology_SA_20_05
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.debian.org/security/2020/dsa-4661
- https://security.netapp.com/advisory/ntap-20200717-0004
- https://security.netapp.com/advisory/ntap-20200424-0003
- https://security.gentoo.org/glsa/202004-10
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc
- https://rustsec.org/advisories/RUSTSEC-2020-0015.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.