VulnerabilityAnalyzed
CVE-2024-3661
VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface.
HIGH 7.6EPSS 4.06%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.06%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.6 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
- EPSS
- 4.06% probability · 90th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-306, CWE-501
- Affected
- fortinet/forticlient · cisco/anyconnect vpn client · cisco/secure client · paloaltonetworks/globalprotect · citrix/secure access client · f5/big-ip access policy manager · watchguard/ipsec mobile vpn client · watchguard/mobile vpn with ssl · zscaler/client connector
- Source
- 9119a7d8-5eab-497f-8521-727c672e3725
References
- https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/Exploit, Press/Media Coverage
- https://bst.cisco.com/quickview/bug/CSCwk05814Third Party Advisory, Vendor Advisory
- https://datatracker.ietf.org/doc/html/rfc2131#section-7Related
- https://datatracker.ietf.org/doc/html/rfc3442#section-7Related
- https://fortiguard.fortinet.com/psirt/FG-IR-24-170Vendor Advisory
- https://issuetracker.google.com/issues/263721377Issue Tracking
- https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/Exploit, Press/Media Coverage
- https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-trafficIssue Tracking
- https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvisionThird Party Advisory
- https://my.f5.com/manage/s/article/K000139553Vendor Advisory
- https://news.ycombinator.com/item?id=40279632Issue Tracking
- https://news.ycombinator.com/item?id=40284111Issue Tracking
- https://security.paloaltonetworks.com/CVE-2024-3661Vendor Advisory
- https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661Vendor Advisory
- https://tunnelvisionbug.com/Exploit, Third Party Advisory
- https://www.agwa.name/blog/post/hardening_openvpn_for_def_conRelated
- https://www.leviathansecurity.com/research/tunnelvisionThird Party Advisory
- https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/Exploit, Press/Media Coverage
- https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009Mitigation, Third Party Advisory, Vendor Advisory
- https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerabilityExploit, Third Party Advisory, Vendor Advisory
- https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/Exploit, Press/Media Coverage
- https://bst.cisco.com/quickview/bug/CSCwk05814Third Party Advisory, Vendor Advisory
- https://datatracker.ietf.org/doc/html/rfc2131#section-7Related
- https://datatracker.ietf.org/doc/html/rfc3442#section-7Related
- https://fortiguard.fortinet.com/psirt/FG-IR-24-170Vendor Advisory
- https://issuetracker.google.com/issues/263721377Issue Tracking
- https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/Exploit, Press/Media Coverage
- https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-trafficIssue Tracking
- https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvisionThird Party Advisory
- https://my.f5.com/manage/s/article/K000139553Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.