CVE-2020-25705

NameCVE-2020-25705
DescriptionA flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing 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. Kernel versions before 5.10 may be vulnerable to this issue.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2483-1, DLA-2494-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)stretch4.9.228-1vulnerable
stretch (security)4.9.258-1fixed
buster4.19.181-1fixed
buster (security)4.19.171-2fixed
bullseye, sid5.10.28-1fixed
linux-4.19 (PTS)stretch (security)4.19.181-1~deb9u1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsourcestretch4.9.246-1DLA-2494-1
linuxsourcebuster4.19.160-1
linuxsource(unstable)5.9.6-1
linux-4.19sourcestretch4.19.160-2~deb9u1DLA-2483-1

Notes

https://git.kernel.org/linus/b38e7819cae946e2edf869e604af1e65a5d241c5
https://www.saddns.net/

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