ID CVE-2020-1967
Summary 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).
References
Vulnerable Configurations
  • cpe:2.3:a:openssl:openssl:1.1.1d:*:*:*:*:*:*:*
    cpe:2.3:a:openssl:openssl:1.1.1d:*:*:*:*:*:*:*
  • cpe:2.3:a:openssl:openssl:1.1.1e:*:*:*:*:*:*:*
    cpe:2.3:a:openssl:openssl:1.1.1e:*:*:*:*:*:*:*
  • cpe:2.3:a:openssl:openssl:1.1.1f:*:*:*:*:*:*:*
    cpe:2.3:a:openssl:openssl:1.1.1f:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • cpe:2.3:o:freebsd:freebsd:12.1:-:*:*:*:*:*:*
    cpe:2.3:o:freebsd:freebsd:12.1:-:*:*:*:*:*:*
CVSS
Base: 5.0
Impact:
Exploitability:
CWE CWE-476
CAPEC
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE NONE PARTIAL
Last major update 21-04-2020 - 14:22
Published 21-04-2020 - 14:15
Last modified 17-07-2020 - 12:15
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