CVE-2021-20322
A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to all
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 4.19.215, 5.4.146, 5.10.65, 5.13.17, 5.14.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- n/a kernel
From 4.15 · fixed in 4.19.215; From 4.20 · fixed in 5.4.146; From 5.5 · fixed in 5.10.65; From 5.11 · fixed in 5.13.17; From 5.14 · fixed in 5.14.4
References 9
bugzilla.redhat.com
git.kernel.org
- pub/scm/linux/kernel/git/torvalds/linux.git/commit?h=v5.15-rc6&id=4785305c05b25a242e5314cc821f54ade4c18810
- pub/scm/linux/kernel/git/torvalds/linux.git/commit?h=v5.15-rc6&id=6457378fe796815c973f631a1904e147d6ee33b1
- pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/ipv4/route.c?h=v5.15-rc6&id=67d6d681e15b578c1725bad8ad079e05d1c48a8e
- pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/ipv6/route.c?h=v5.15-rc6&id=a00df2caffed3883c341d5685f830434312e4a43