CVE - CVE-2023-4809

CVE-ID
CVE-2023-4809	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed. That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is. As a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://security.netapp.com/advisory/ntap-20231221-0009/ MISC:https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc MLIST:[oss-security] 20230908 CVE-2023-4809: FreeBSD pf bypass when using IPv6 URL:http://www.openwall.com/lists/oss-security/2023/09/08/5 MLIST:[oss-security] 20230908 Re: CVE-2023-4809: FreeBSD pf bypass when using IPv6 URL:http://www.openwall.com/lists/oss-security/2023/09/08/7 MLIST:[oss-security] 20230909 Re: CVE-2023-4809: FreeBSD pf bypass when using IPv6 URL:http://www.openwall.com/lists/oss-security/2023/09/08/6
Assigning CNA
FreeBSD
Date Record Created
20230906	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20230906)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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