Covert Timing Channel Affecting python2-rsa package, versions <0:3.4.1-1.amzn2.0.4


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
1.65% (75th percentile)

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  • Snyk IDSNYK-AMZN2-PYTHON2RSA-5789339
  • published20 Jul 2023
  • disclosed12 Nov 2020

Introduced: 12 Nov 2020

CVE-2020-25658  (opens in a new tab)
CWE-385  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 python2-rsa to version 0:3.4.1-1.amzn2.0.4 or higher.
This issue was patched in ALAS2-2023-2150.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python2-rsa package and not the python2-rsa package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

It was found that python-rsa is vulnerable to Bleichenbacher timing attacks. An attacker can use this flaw via the RSA decryption API to decrypt parts of the cipher text encrypted with RSA.

CVSS Base Scores

version 3.1