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osvGoogleOSV:PSF-2023-6
HistoryAug 24, 2023 - 12:00 a.m.

hmac.compare_digest() accumulator not constant-time

2023-08-2400:00:00
Google
osv.dev
6
hmac
python
security
optimization
variable

5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

7.1 High

AI Score

Confidence

Low

0.001 Low

EPSS

Percentile

23.9%

JSON

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.

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5.9 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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7.1 High

AI Score

Confidence

Low

0.001 Low

EPSS

Percentile

23.9%

JSON
Related for OSV:PSF-2023-6
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