Use of Insufficiently Random Values Affecting bpftool package, versions <0:4.18.0-305.49.1.el8_4


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.63% (79th percentile)

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  • Snyk IDSNYK-RHEL8-BPFTOOL-4180515
  • published19 Oct 2021
  • disclosed26 Aug 2021

Introduced: 26 Aug 2021

CVE-2021-20322  (opens in a new tab)
CWE-330  (opens in a new tab)

How to fix?

Upgrade RHEL:8 bpftool to version 0:4.18.0-305.49.1.el8_4 or higher.
This issue was patched in RHSA-2022:4829.

NVD Description

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

A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass the source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well.

CVSS Scores

version 3.1