Rapid7 Vulnerability & Exploit Database

pfSense: pfSense-SA-23_07.kernel: Denial of Service due to Kernel Panic from Oversize IPv6 Packets

Free InsightVM Trial No Credit Card Necessary
Watch Demo See how it all works
Back to Search

pfSense: pfSense-SA-23_07.kernel: Denial of Service due to Kernel Panic from Oversize IPv6 Packets

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/11/2023
Created
06/23/2023
Added
06/23/2023
Modified
06/26/2023

Description

An IPv6 packet larger than the MTU on an interface can lead to a kernel panic in pf. For example, by generating a large ICMP packet with "ping6 -s 65500 <target address>" sent from another host to device running pfSense software. This problem is present in pfSense Plus version 23.01. It does not affect any release of pfSense CE, only development snapshots. While this issue was due to an upstream problem in the FreeBSD 14.x kernel, which is still under development, it was not present in any released version of FreeBSD. Thus, this DoS will not have a FreeBSD security advisory. A kernel panic causes a sudden reboot of the host, rendering it unavailable until it completes the reboot process, thus causing a denial of service for the interim period. On systems using UFS, it is also possible that a kernel panic may require manual intervention to repair the filesystem after a sudden reboot.

Solution(s)

  • pfsense-upgrade-latest

References

insightVM

Advanced vulnerability management analytics and reporting.
Key Features
Free InsightVM Trial View All Features

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;