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CVE-2023-4809— pf incorrectly handles multiple IPv6 fragment headers

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于IPv6片段可能会绕过基于假设所有片段均已重新组装而编写的防火墙规则，并因此由主机转发或处理。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.68% · P49

Possible ATT&CK Techniques 1 AI

T1564.004 · NTFS File Attributes
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I. Basic Information for CVE-2023-4809

Vulnerability Information
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Vulnerability Title
pf incorrectly handles multiple IPv6 fragment headers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
附加特殊元素净化处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于IPv6片段可能会绕过基于假设所有片段均已重新组装而编写的防火墙规则，并因此由主机转发或处理。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 13.2-RELEASE ~ p3 -

II. Public POCs for CVE-2023-4809

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III. Intelligence Information for CVE-2023-4809

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Vendor Advisories for CVE-2023-4809 (1)

Mailing List Discussions for CVE-2023-4809 (2)

Other References for CVE-2023-4809 (1)

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-167

V. Comments for CVE-2023-4809

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