Improperly Implemented Security Check for Standard Affecting nss-tools package, versions <0:3.19.1-3.el7_1


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.09% (40th percentile)

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  • Snyk IDSNYK-RHEL7-NSSTOOLS-5020602
  • published26 Jul 2021
  • disclosed2 Jul 2015

Introduced: 2 Jul 2015

CVE-2015-2721  (opens in a new tab)
CWE-358  (opens in a new tab)

How to fix?

Upgrade RHEL:7 nss-tools to version 0:3.19.1-3.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-tools package and not the nss-tools package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

References

CVSS Scores

version 3.1