CVE-2020-1967

CVE-2020-1967: vulnerability in OpenSSL

Segmentation fault in SSL_check_chain

Published · Updated

15Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 53%
exploitation probability
53%top 1% of all CVEs
observed exploitation
nono source reports it
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).
Affected products
OpenSSL · OpenSSL
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References
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.htmlhttp://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.htmlhttp://seclists.org/fulldisclosure/2020/May/5https://github.com/irsl/CVE-2020-1967https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3Ehttps://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3Ehttps://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3Ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD/