1. DNS/毒盛/2021/UCR/CVE-2021-20322
Contents
Bug 2014230 (CVE-2021-20322) - CVE-2021-20322 kernel:
- new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies
https://bugzilla.redhat.com/show_bug.cgi?id=2014230
https://access.redhat.com/security/cve/cve-2021-20322
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.
Public 2021年8月26日
New side channel attack resurrects DNS poisoning threat