Allocation of Resources Without Limits or Throttling Affecting nss-softokn-freebl package, versions <0:3.67.0-6.el8_4


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.71% (81st percentile)

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  • Snyk ID SNYK-RHEL8-NSSSOFTOKNFREEBL-4082129
  • published 26 Jul 2021
  • disclosed 19 Oct 2020

How to fix?

Upgrade RHEL:8 nss-softokn-freebl to version 0:3.67.0-6.el8_4 or higher.
This issue was patched in RHSA-2021:3572.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nss-softokn-freebl package and not the nss-softokn-freebl package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.

References

CVSS Scores

version 3.1
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NVD

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

Red Hat

7.5 high
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SUSE

7.5 high