CVE-2020-1967
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).
- CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS
- 53% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)
- CWE
- CWE-476
- Published
- Modified
- Record from
- the NVD, synced
Affected
- broadcom:fabric_operating_system
- debian:debian_linux
- fedoraproject:fedora
- freebsd:freebsd
- jdedwards:enterpriseone
- netapp:active_iq_unified_manager
- netapp:e-series_performance_analyzer
- netapp:oncommand_insight
- netapp:oncommand_workflow_automation
- netapp:smi-s_provider
- netapp:snapcenter
- netapp:steelstore_cloud_integrated_storage
- openssl:openssl
- opensuse:leap
- oracle:application_server
- oracle:enterprise_manager_base_platform
- oracle:enterprise_manager_for_storage_management
- oracle:enterprise_manager_ops_center
- oracle:http_server
- oracle:jd_edwards_world_security
- oracle:mysql
- oracle:mysql_connectors
- oracle:mysql_enterprise_monitor
- oracle:mysql_workbench
- oracle:peoplesoft_enterprise_peopletools
- tenable:log_correlation_engine
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jq65-29v4-4x35 | crates.io | openssl-src | >=111.6.0 <111.9.0 | 111.9.0 |
| RUSTSEC-2020-0015 | crates.io | openssl-src | >=111.6.0 <111.9.0 | 111.9.0 |
References
- 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