PRNG Seed Error Affecting nss-tools package, versions <0:3.36.0-5.82.amzn1


0.0
medium

Snyk CVSS

    Attack Complexity High

    Threat Intelligence

    EPSS 4.28% (93rd percentile)
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NVD
5.9 medium
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SUSE
4.8 medium
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Red Hat
4.8 medium

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  • Snyk ID SNYK-AMZN201803-NSSTOOLS-1715548
  • published 27 Sep 2021
  • disclosed 29 Apr 2019

How to fix?

Upgrade Amazon-Linux:2018.03 nss-tools to version 0:3.36.0-5.82.amzn1 or higher.
This issue was patched in ALAS-2018-1095.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nss-tools package and not the nss-tools package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.

When handling a SSLv2-compatible ClientHello request, the server doesn't generate a new random value but sends an all-zero value instead. This results in full malleability of the ClientHello for SSLv2 used for TLS 1.2 in all versions prior to NSS 3.39. This does not impact TLS 1.3.