PT-2024-37769 · Pf+1 · Pf+1

Enrico Bassetti · Published 2024-08-07 · Updated 2024-11-26 · CVE-2024-6640

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions pf (affected versions not specified)

Description The issue concerns ICMPv6 Neighbor Discovery (ND) where 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 must 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.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Incorrect Default Permissions

Weakness Enumeration

CWE-276

Related Identifiers

CVE-2024-6640

FREEBSD-SA-24_05

Affected Products

Freebsd

Pf

References · 6

• https://security.freebsd.org/advisories/FreeBSD-SA-24:05.pf.asc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-6640 · Security Note
• https://twitter.com/VulmonFeeds/status/1823017115093258552 · Twitter Post
• https://security.netapp.com/advisory/ntap-20240816-0008 · Note
• https://freebsd.org/security/advisories/FreeBSD-SA-24:05.pf.asc · Note
• https://t.me/cvenotify/102575 · Telegram Post