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

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

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 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]