https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/

https://bst.cisco.com/quickview/bug/CSCwk05814

https://datatracker.ietf.org/doc/html/rfc2131#section-7

https://datatracker.ietf.org/doc/html/rfc3442#section-7

https://fortiguard.fortinet.com/psirt/FG-IR-24-170

https://issuetracker.google.com/issues/263721377

https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/

https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic

https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision

https://my.f5.com/manage/s/article/K000139553

https://news.ycombinator.com/item?id=40279632

https://news.ycombinator.com/item?id=40284111

https://security.paloaltonetworks.com/CVE-2024-3661

https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661

https://tunnelvisionbug.com/

https://www.agwa.name/blog/post/hardening_openvpn_for_def_con

https://www.leviathansecurity.com/research/tunnelvision

https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/

https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009

https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://bst.cisco.com/quickview/bug/CSCwk05814 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://fortiguard.fortinet.com/psirt/FG-IR-24-170 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://my.f5.com/manage/s/article/K000139553 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://security.paloaltonetworks.com/CVE-2024-3661 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/ [No types assigned]

By design, the DHCP protocol does not authenticate messages, including for example the classless static route option (121). An attacker with the ability to send DHCP messages can manipulate routes to redirect VPN traffic, allowing the attacker to read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN. Many, if not most VPN systems based on IP routing are susceptible to such attacks.

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.

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://news.ycombinator.com/item?id=40284111 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.agwa.name/blog/post/hardening_openvpn_for_def_con [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/ [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://issuetracker.google.com/issues/263721377 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/ [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://news.ycombinator.com/item?id=40279632 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://tunnelvisionbug.com/ [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.leviathansecurity.com/research/tunnelvision [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.leviathansecurity.com/blog/tunnelvision

By design, the DHCP protocol does not authenticate messages, including for example the classless static route option (121). An attacker with the ability to send DHCP messages can manipulate routes to redirect VPN traffic, allowing the attacker to read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN. Many, if not most VPN systems based on IP routing are susceptible to such attacks.

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:L

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government CWE-306

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government CWE-501

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://datatracker.ietf.org/doc/html/rfc2131#section-7 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://datatracker.ietf.org/doc/html/rfc3442#section-7 [No types assigned]

Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government https://www.leviathansecurity.com/blog/tunnelvision [No types assigned]