CVE-2020-1967

NameCVE-2020-1967
DescriptionServer 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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4661-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)stretch1.1.0l-1~deb9u1fixed
stretch (security)1.1.0l-1~deb9u6fixed
buster1.1.1n-0+deb10u1fixed
buster (security)1.1.1n-0+deb10u2fixed
bullseye1.1.1n-0+deb11u1fixed
bullseye (security)1.1.1n-0+deb11u2fixed
bookworm1.1.1o-1fixed
sid3.0.3-5fixed
openssl1.0 (PTS)stretch1.0.2u-1~deb9u1fixed
stretch (security)1.0.2u-1~deb9u7fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsourcejessie(not affected)
opensslsourcestretch(not affected)
opensslsourcebuster1.1.1d-0+deb10u3DSA-4661-1
opensslsource(unstable)1.1.1g-1
openssl1.0source(unstable)(not affected)

Notes

[stretch] - openssl <not-affected> (Only affects 1.1.1d to 1.1.1f)
[jessie] - openssl <not-affected> (Only affects 1.1.1d to 1.1.1f)
- openssl1.0 <not-affected> (Only affects 1.1.1d to 1.1.1f)
https://www.openssl.org/news/secadv/20200421.txt

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