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Debian LTS Advisory DLA-3410-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                       Guilhem Moulin
May 01, 2023                                  https://wiki.debian.org/LTS
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Package        : openvswitch
Version        : 2.10.7+ds1-0+deb10u4
CVE ID         : CVE-2023-1668
Debian Bug     : 1034042

David Marchand discovered that Open vSwitch, a multilayer, software-based,
Ethernet virtual switch, was vulnerable to crafted IP packets with ip proto
set to 0, potentially causing a denial of service.

Triggering the vulnerability requires an attacker to send a crafted IP
packet with protocol field set to 0 and the flow rules to contain 'set'
actions on other fields in the IP protocol header.  The resulting flows will
omit required actions, and fail to mask the IP protocol field, resulting in
a large bucket which captures all IP packets.

For Debian 10 buster, this problem has been fixed in version
2.10.7+ds1-0+deb10u4.

We recommend that you upgrade your openvswitch packages.

For the detailed security status of openvswitch please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/openvswitch

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS