Vulnerability-Lookup

VAR-202405-0458

Vulnerability from variot - Updated: 2025-01-15 23:06

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.

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CVE-2024-3661 (GCVE-0-2024-3661)

Vulnerability from cvelistv5 – Published: 2024-05-06 18:31 – Updated: 2024-08-28 19:09

Title

DHCP routing options can manipulate interface-based VPN traffic

Summary

Severity

7.6 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-08 04:00 UTC

CWE

CWE-306 - Missing Authentication for Critical Function
CWE-501 - Trust Boundary Violation

Assigner

cisa-cg CNA under the CISA root

CNA scorecard B 76/100 over 127 records in the last 180 days details

References

20 references

URL	Tags
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-at…
https://krebsonsecurity.com/2024/05/why-your-vpn-…
https://issuetracker.google.com/issues/263721377
https://mullvad.net/en/blog/evaluating-the-impact…
https://www.zscaler.com/blogs/security-research/c…
https://lowendtalk.com/discussion/188857/a-rogue-…
https://news.ycombinator.com/item?id=40284111
https://www.agwa.name/blog/post/hardening_openvpn…
https://www.theregister.com/2024/05/07/vpn_tunnel…
https://support.citrix.com/article/CTX677069/clou…
https://www.watchguard.com/wgrd-psirt/advisory/wg…
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

Impacted products

1 product

Vendor	Product	Version
IETF	DHCP	Affected: 0

Date Public

2002-12-31 01:00

Show details on NVD website

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                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-08T04:00:07.962328Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-08-28T19:09:06.995Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
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          "vendor": "IETF",
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              "status": "affected",
              "version": "0"
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      "datePublic": "2002-12-31T01:00:00.000Z",
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          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "DHCP can add routes to a client\u2019s 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."
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          ],
          "value": "DHCP can add routes to a client\u2019s 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."
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      ],
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            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
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            {
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              "type": "CWE"
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          ]
        },
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              "cweId": "CWE-501",
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        "dateUpdated": "2024-07-01T15:04:50.790Z",
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      "references": [
        {
          "url": "https://datatracker.ietf.org/doc/html/rfc2131#section-7"
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        {
          "url": "https://datatracker.ietf.org/doc/html/rfc3442#section-7"
        },
        {
          "url": "https://tunnelvisionbug.com/"
        },
        {
          "url": "https://www.leviathansecurity.com/research/tunnelvision"
        },
        {
          "url": "https://news.ycombinator.com/item?id=40279632"
        },
        {
          "url": "https://arstechnica.com/security/2024/05/novel-attack-against-virtually-all-vpn-apps-neuters-their-entire-purpose/"
        },
        {
          "url": "https://krebsonsecurity.com/2024/05/why-your-vpn-may-not-be-as-secure-as-it-claims/"
        },
        {
          "url": "https://issuetracker.google.com/issues/263721377"
        },
        {
          "url": "https://mullvad.net/en/blog/evaluating-the-impact-of-tunnelvision"
        },
        {
          "url": "https://www.zscaler.com/blogs/security-research/cve-2024-3661-k-tunnelvision-exposes-vpn-bypass-vulnerability"
        },
        {
          "url": "https://lowendtalk.com/discussion/188857/a-rogue-dhcp-server-within-your-network-can-and-will-hijack-your-vpn-traffic"
        },
        {
          "url": "https://news.ycombinator.com/item?id=40284111"
        },
        {
          "url": "https://www.agwa.name/blog/post/hardening_openvpn_for_def_con"
        },
        {
          "url": "https://www.theregister.com/2024/05/07/vpn_tunnelvision_dhcp/"
        },
        {
          "url": "https://support.citrix.com/article/CTX677069/cloud-software-group-security-advisory-for-cve20243661"
        },
        {
          "url": "https://www.watchguard.com/wgrd-psirt/advisory/wgsa-2024-00009"
        },
        {
          "url": "https://bst.cisco.com/quickview/bug/CSCwk05814"
        },
        {
          "url": "https://security.paloaltonetworks.com/CVE-2024-3661"
        },
        {
          "url": "https://fortiguard.fortinet.com/psirt/FG-IR-24-170"
        },
        {
          "url": "https://my.f5.com/manage/s/article/K000139553"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "DHCP routing options can manipulate interface-based VPN traffic",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725",
    "assignerShortName": "cisa-cg",
    "cveId": "CVE-2024-3661",
    "datePublished": "2024-05-06T18:31:21.217Z",
    "dateReserved": "2024-04-11T17:24:22.637Z",
    "dateUpdated": "2024-08-28T19:09:06.995Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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