CVE-2021-4160

NameCVE-2021-4160
DescriptionThere is a carry propagation bug in the MIPS32 and MIPS64 squaring procedure. Many EC algorithms are affected, including some of the TLS 1.3 default curves. Impact was not analyzed in detail, because the pre-requisites for attack are considered unlikely and include reusing private keys. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be significant. However, for an attack on TLS to be meaningful, the server would have to share the DH private key among multiple clients, which is no longer an option since CVE-2016-0701. This issue affects OpenSSL versions 1.0.2, 1.1.1 and 3.0.0. It was addressed in the releases of 1.1.1m and 3.0.1 on the 15th of December 2021. For the 1.0.2 release it is addressed in git commit 6fc1aaaf3 that is available to premium support customers only. It will be made available in 1.0.2zc when it is released. The issue only affects OpenSSL on MIPS platforms. Fixed in OpenSSL 3.0.1 (Affected 3.0.0). Fixed in OpenSSL 1.1.1m (Affected 1.1.1-1.1.1l). Fixed in OpenSSL 1.0.2zc-dev (Affected 1.0.2-1.0.2zb).
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-5103-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssl (PTS)stretch1.1.0l-1~deb9u1vulnerable
stretch (security)1.1.0l-1~deb9u6vulnerable
buster1.1.1n-0+deb10u1fixed
buster (security)1.1.1n-0+deb10u3fixed
bullseye1.1.1n-0+deb11u1fixed
bullseye (security)1.1.1n-0+deb11u3fixed
bookworm3.0.3-8fixed
sid3.0.4-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensslsourcebuster1.1.1d-0+deb10u8DSA-5103-1
opensslsourcebullseye1.1.1k-1+deb11u2DSA-5103-1
opensslsource(unstable)1.1.1m-1

Notes

[stretch] - openssl <ignored> (This is MIPS-specific and we don't support MIPS for stretch-security)
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=e9e726506cd2a3fd9c0f12daf8cc1fe934c7dddb (OpenSSL_1_1_1m)
https://mta.openssl.org/pipermail/openssl-announce/2022-January/000214.html
https://www.openssl.org/news/secadv/20220128.txt

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