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.
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Link | Tags |
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https://bugs.python.org/issue40791 | issue tracking patch vendor advisory exploit |
https://lists.debian.org/debian-lts-announce/2023/09/msg00022.html | third party advisory mailing list |
https://security.netapp.com/advisory/ntap-20231006-0013/ | third party advisory |
https://lists.debian.org/debian-lts-announce/2023/10/msg00017.html | third party advisory mailing list |