CVE-2020-36242

NameCVE-2020-36242
DescriptionIn the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
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)
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python-cryptography (PTS)stretch1.7.1-3+deb9u2fixed
buster2.6.1-3+deb10u2vulnerable
bullseye, sid3.3.2-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python-cryptographysourcestretch(not affected)
python-cryptographysource(unstable)3.3.2-1

Notes

[buster] - python-cryptography <no-dsa> (Minor issue)
[stretch] - python-cryptography <not-affected> (Vulnerable code introduced later)
https://github.com/pyca/cryptography/issues/5615

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