DHCP routing options can manipulate interface-based VPN traffic (IETF DHCP)
At a glance
- Source
- NVD
- EPSS
- EPSS 4.06 % · percentile 91 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- cisa-cg
- NVD status
- Analyzed
Description
DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN.
Weaknesses (CWE)
References
- https://datatracker.ietf.org/doc/html/rfc2131#section-7
- https://datatracker.ietf.org/doc/html/rfc3442#section-7
- https://tunnelvisionbug.com/
- https://www.leviathansecurity.com/research/tunnelvision
- https://news.ycombinator.com/item?id=40279632
- https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/
- https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/
- https://issuetracker.google.com/issues/263721377
- https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision
- https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability
- https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic
- https://news.ycombinator.com/item?id=40284111
- https://www.agwa.name/blog/post/hardening_openvpn_for_def_con
- https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/
- https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009
- https://bst.cisco.com/quickview/bug/CSCwk05814
- https://security.paloaltonetworks.com/CVE-2024-3661
- https://fortiguard.fortinet.com/psirt/FG-IR-24-170
- https://my.f5.com/manage/s/article/K000139553
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.6 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L | cisa-cg |
| CVSS 3.1 | HIGH 7.6 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L | NVD · 9119a7d8-5eab-497f-8521-727c672e3725 (Secondary) |
| CVSS 3.1 | HIGH 7.6 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2024-32236
- GCVE · GCVE-0-2024-3661
CERT-FR advisories
- CERTFR-2025-AVI-0263 — Multiples vulnérabilités dans HPE Aruba Networking Virtual Intranet Access · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0255 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0517 — Vulnérabilité dans Citrix Secure Access client · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0484 — Multiples vulnérabilités dans les produits Fortinet · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0414 — Vulnérabilité dans les produits Palo Alto Networks · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:linux:*:*≥ 6.4.0 < 7.2.5cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:*≥ 6.4.0 < 7.2.5cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:*≥ 6.4.0 < 7.2.5cpe:2.3:a:fortinet:forticlient:7.4.0:*:*:*:*:linux:*:*cpe:2.3:a:fortinet:forticlient:7.4.0:*:*:*:*:macos:*:*cpe:2.3:a:fortinet:forticlient:7.4.0:*:*:*:*:windows:*:*cpe:2.3:a:cisco:anyconnect_vpn_client:-:*:*:*:*:*:*:*cpe:2.3:a:cisco:secure_client:-:*:*:*:*:*:*:*cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:iphone_os:*:*cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:linux:*:*cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:macos:*:*cpe:2.3:a:paloaltonetworks:globalprotect:*:*:*:*:*:windows:*:*cpe:2.3:a:citrix:secure_access_client:*:*:*:*:*:*:*:*< 24.06.1cpe:2.3:a:citrix:secure_access_client:*:*:*:*:*:*:*:*< 24.8.5cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*≥ 7.2.3 ≤ 7.2.5cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*≥ 15.1.0 ≤ 15.1.10cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*≥ 16.1.0 ≤ 16.1.5cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*≥ 17.1.0 ≤ 17.1.2cpe:2.3:a:watchguard:ipsec_mobile_vpn_client:*:*:*:*:*:macos:*:*cpe:2.3:a:watchguard:ipsec_mobile_vpn_client:*:*:*:*:*:windows:*:*cpe:2.3:a:watchguard:mobile_vpn_with_ssl:*:*:*:*:*:macos:*:*cpe:2.3:a:watchguard:mobile_vpn_with_ssl:*:*:*:*:*:windows:*:*cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:linux:*:*< 1.5.1.25cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:macos:*:*< 4.2.0.282cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:linux:*:*≥ 3.7 < 3.7.0.134cpe:2.3:a:zscaler:client_connector:-:*:*:*:*:windows:*:*
Affected products
| Product | Versions |
|---|---|
| IETF · DHCP | affected 0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |