CVE-2024-6640 (GCVE-0-2024-6640)
Vulnerability from cvelistv5 – Published: 2024-08-11 02:33 – Updated: 2024-11-26 15:05
VLAI
EPSS
VEX
Title
pf incorrectly matches different ICMPv6 states in the state table
Summary
In ICMPv6 Neighbor Discovery (ND), the ID is always 0. When pf is configured to allow ND and block incoming Echo Requests, a crafted Echo Request packet after a Neighbor Solicitation (NS) can trigger an Echo Reply. The packet has to come from the same host as the NS and have a zero as identifier to match the state created by the Neighbor Discovery and allow replies to be generated.
ICMPv6 packets with identifier value of zero bypass firewall rules written on the assumption that the incoming packets are going to create a state in the state table.
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-13 18:58 UTC
CWE
- CWE-276 - Incorrect Default Permissions
Assigner
freebsd
CNA
References
2 references
| URL | Tags |
|---|---|
| https://security.freebsd.org/advisories/FreeBSD-S… | vendor-advisory |
| https://security.netapp.com/advisory/ntap-2024081… |
Impacted products
Date Public
2024-08-07 15:00
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