PSF-2023-6

vendorUSosv

hmac.compare_digest() accumulator not constant-time

view advisory published 2023-08-24Licence: per source

An 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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2022-48566US	medium5.9	1.30% (70th)	—	2023-08-22
An 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_di…

references

External citations — patches, advisories, analysis.

https://bugs.python.org/issue40791WEB
https://nvd.nist.gov/vuln/detail/CVE-2022-48566ADVISORY

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