VULNERABILITY

Red Hat: CVE-2021-20322: CVE-2021-20322 kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies (Multiple Advisories)

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Red Hat: CVE-2021-20322: CVE-2021-20322 kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies (Multiple Advisories)

Severity
6
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:N)
Published
02/18/2022
Created
05/14/2022
Added
05/13/2022
Modified
11/26/2024

Description

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.

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • CVE-2021-20322
  • RHSA-2022:1975
  • RHSA-2022:1988
  • RHSA-2022:4829
  • RHSA-2022:4835

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