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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-4661-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)bullseye1.1.1w-0+deb11u1fixed
bullseye (security)1.1.1w-0+deb11u2fixed
bookworm3.0.14-1~deb12u1fixed
bookworm (security)3.0.14-1~deb12u2fixed
sid, trixie3.3.2-2fixed

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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