CVE-2021-3449

NameCVE-2021-3449
DescriptionAn OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it was present in the initial ClientHello), but includes a signature_algorithms_cert extension then a NULL pointer dereference will result, leading to a crash and a denial of service attack. A server is only vulnerable if it has TLSv1.2 and renegotiation enabled (which is the default configuration). OpenSSL TLS clients are not impacted by this issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by this issue. Fixed in OpenSSL 1.1.1k (Affected 1.1.1-1.1.1j).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDSA-4875-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)jessie, jessie (lts)1.0.1t-1+deb8u21fixed
stretch (security)1.1.0l-1~deb9u6fixed
stretch (lts), stretch1.1.0l-1~deb9u9fixed
buster1.1.1n-0+deb10u3fixed
buster (security)1.1.1n-0+deb10u6fixed
bullseye1.1.1w-0+deb11u1fixed
bullseye (security)1.1.1n-0+deb11u5fixed
bookworm (security), bookworm3.0.11-1~deb12u2fixed
trixie3.1.5-1fixed
sid3.1.5-1.1fixed
openssl1.0 (PTS)stretch (security)1.0.2u-1~deb9u7fixed
stretch (lts), stretch1.0.2u-1~deb9u9fixed

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+deb10u6DSA-4875-1
opensslsource(unstable)1.1.1k-1
openssl1.0source(unstable)(not affected)

Notes

[stretch] - openssl <not-affected> (Vulnerable code introduced later)
- openssl1.0 <not-affected> (Vulnerability does not impact 1.0.2 series)
https://www.openssl.org/news/secadv/20210325.txt
Introduced by: https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=c589c34e619c8700ab16b152dd9c8ee58356b319 (OpenSSL_1_1_1-pre1)
Prerequisite: https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=46d81bcabe2d36055bdd37079ed6acf976d967a7
Prerequisite (test): https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=3ff38629a2df6635f36bfb79513cc6440db8cd70
Fixed by: https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=fb9fa6b51defd48157eeb207f52181f735d96148 (OpenSSL_1_1_1k)
Followup: https://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=d33c2a3d8453a75509bcc8d2cf7d2dc2a3a518d0
[jessie] - openssl <not-affected> (vulnerable code not present)

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