CVE-2022-48566

NameCVE-2022-48566
DescriptionAn issue was discovered in compare_digest in Lib/hmac.py in Python through 3.9.1. Constant-time-defeating optimisations were possible in the accumulator variable in hmac.compare_digest.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-3575-1, DLA-3614-1, ELA-950-1, ELA-997-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python2.7 (PTS)jessie, jessie (lts)2.7.9-2-ds1-1+deb8u11fixed
stretch (security)2.7.13-2+deb9u6vulnerable
stretch (lts), stretch2.7.13-2+deb9u8fixed
buster2.7.16-2+deb10u1vulnerable
buster (security)2.7.16-2+deb10u3fixed
bullseye2.7.18-8+deb11u1fixed
python3.4 (PTS)jessie, jessie (lts)3.4.2-1+deb8u15vulnerable
python3.5 (PTS)stretch (security)3.5.3-1+deb9u5vulnerable
stretch (lts), stretch3.5.3-1+deb9u8fixed
python3.7 (PTS)buster3.7.3-2+deb10u3vulnerable
buster (security)3.7.3-2+deb10u6fixed
python3.9 (PTS)bullseye3.9.2-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python2.7sourcejessie2.7.9-2-ds1-1+deb8u11ELA-950-1
python2.7sourcestretch2.7.13-2+deb9u8ELA-950-1
python2.7sourcebuster2.7.16-2+deb10u3DLA-3575-1
python2.7sourcebullseye2.7.18-8+deb11u1
python2.7source(unstable)(unfixed)
python3.4source(unstable)(unfixed)
python3.5sourcestretch3.5.3-1+deb9u8ELA-997-1
python3.5source(unstable)(unfixed)
python3.7sourcebuster3.7.3-2+deb10u6DLA-3614-1
python3.7source(unstable)(unfixed)
python3.9source(unstable)3.9.1~rc1-1

Notes

https://bugs.python.org/issue40791
https://github.com/python/cpython/commit/8183e11d87388e4e44e3242c42085b87a878f781 (v3.9.0b2)
https://github.com/python/cpython/commit/c1bbca5b004b3f74d240ef8a76ff445cc1a27efb (v3.9.1rc1)
https://github.com/python/cpython/commit/db95802bdfac4d13db3e2a391ec7b9e2f8d92dbe (v3.7.10)
https://github.com/python/cpython/commit/8bef9ebb1b88cfa4b2a38b93fe4ea22015d8254a (v3.6.13)
https://github.com/python/cpython/issues/84968

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