Covert Timing Channel Affecting python-cryptography package, versions <3.2.1-1


Severity

Recommended
0.0
medium
0
10

Snyk's Security Team recommends NVD's CVSS assessment

    Threat Intelligence

    EPSS
    0.11% (46th percentile)

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  • Snyk ID SNYK-DEBIAN13-PYTHONCRYPTOGRAPHY-5692944
  • published 27 Oct 2020
  • disclosed 11 Jan 2021

How to fix?

Upgrade Debian:13 python-cryptography to version 3.2.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-cryptography package and not the python-cryptography package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.

CVSS Scores

version 3.1
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NVD

5.9 medium
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    None
  • Availability (A)
    None
Expand this section

SUSE

5.9 medium
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Red Hat

5.9 medium