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Use of a Broken or Risky Cryptographic Algorithm Affecting nss-util package, versions <0:3.19.1-1.el7_1

Severity

 Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
96.89% (100th percentile)

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  • Snyk IDSNYK-RHEL7-NSSUTIL-5050222
  • published26 Jul 2021
  • disclosed20 May 2015
Report a new vulnerability Found a mistake?

Introduced: 20 May 2015

CVE-2015-4000  (opens in a new tab)
CWE-327  (opens in a new tab)

How to fix?

Upgrade RHEL:7 nss-util to version 0:3.19.1-1.el7_1 or higher.
This issue was patched in RHSA-2015:1185.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nss-util package and not the nss-util package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

References