CVE-2019-5597

Public Exploit

Description

In FreeBSD 11.3-PRERELEASE and 12.0-STABLE before r347591, 11.2-RELEASE before 11.2-RELEASE-p10, and 12.0-RELEASE before 12.0-RELEASE-p4, a bug in the pf IPv6 fragment reassembly logic incorrectly uses the last extension header offset from the last received packet instead of the first packet allowing maliciously crafted IPv6 packets to cause a crash or potentially bypass the packet filter.

Category

9.1
CVSS
Severity: Critical
CVSS 3.0 •
CVSS 2.0 •
EPSS 2.20% Top 20%
Vendor Advisory FreeBSD.org
Affected: n/a FreeBSD
Published at:
Updated at:

References

Link Tags
https://security.FreeBSD.org/advisories/FreeBSD-SA-19:05.pf.asc patch vendor advisory
https://www.synacktiv.com/ressources/Synacktiv_OpenBSD_PacketFilter_CVE-2019-5597_ipv6_frag.pdf third party advisory exploit
http://packetstormsecurity.com/files/152933/FreeBSD-Security-Advisory-FreeBSD-SA-19-05.pf.html third party advisory vdb entry
http://www.securityfocus.com/bid/108395 vdb entry
https://security.netapp.com/advisory/ntap-20190611-0001/
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html

Frequently Asked Questions

What is the severity of CVE-2019-5597?
CVE-2019-5597 has been scored as a critical severity vulnerability.
How to fix CVE-2019-5597?
To fix CVE-2019-5597, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-5597 being actively exploited in the wild?
It is possible that CVE-2019-5597 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-5597?
CVE-2019-5597 affects n/a FreeBSD.
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