Out-of-bounds Read Affecting nss package, versions <0:3.53.1-17.el8_3


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    EPSS
    0.24% (63rd percentile)

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  • Snyk ID SNYK-RHEL8-NSS-3954908
  • published 26 Jul 2021
  • disclosed 27 Jul 2020

How to fix?

Upgrade RHEL:8 nss to version 0:3.53.1-17.el8_3 or higher.
This issue was patched in RHSA-2021:0538.

NVD Description

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

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.

CVSS Scores

version 3.1
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NVD

9.1 critical
  • Attack Vector (AV)
    Network
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    None
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    None
  • Availability (A)
    High
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Red Hat

7.4 high
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SUSE

9.1 critical