GHSA-hqmp-g7ph-x543: Quincy TunnelVision - Decloaking VPNs Using Vulnerability

MODERATE
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CVSS 5.3
CWE-200
Published
Advisory Summary

GHSA-hqmp-g7ph-x543 is a MODERATE (CVSS 5.3) tunnelvision - decloaking vpns using vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Quincy libraries in the crates.io ecosystem. The issue involves tunnelvision - decloaking vpns using dhcp. Remediation is available in the latest vendor maintenance releases.

GHSA-hqmp-g7ph-x543 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-hqmp-g7ph-x543
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Quincy
Package Ecosystem crates.io
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Adjacent (AV:A)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix GHSA-hqmp-g7ph-x543

To remediate this vulnerability, upgrade all affected Quincy dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

quincy fixed: Latest secure release 
Upgrade quincy to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for quincy

How to Check if You Are Affected

To determine whether your application is affected by GHSA-hqmp-g7ph-x543, inspect your project dependencies for Quincy:

inspect dependencies for quincy

Analyze the terminal output to locate any version of Quincy in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Quincy, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A new decloaking technique for nearly all VPN implementations has been found, which allows attackers to inject entries into the routing tables of unsuspecting victims using DHCP option 121. This allows attackers to redirect traffic, which is supposed to be sent encrypted over the VPN, through the physical interface handling DHCP for the network the victim's computer is connected to, effectively bypassing the VPN connection. ### Impact All users are potentially affected, as this attack vector can be used against _any_ VPN implementation without mitigations in place. ### Patches Currently, there are no existing mitigations employed by Quincy. ### Workarounds Disabling DHCP option 121 in the DHCP client is a potential workaround, as it prevents this kind of attack. ### References https://www.leviathansecurity.com/blog/tunnelvision

GHSA-hqmp-g7ph-x543 Affected Quincy Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
quincy
 crates.io
≤ 0.13.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/M0dEx/quincy/security/advisories/GHSA-hqmp-g7ph-x543
NVD — GHSA-hqmp-g7ph-x543 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-3661
Quincy Source Repository REPOSITORY
https://github.com/M0dEx/quincy
Quincy Security Information SECURITY
https://www.leviathansecurity.com/blog/tunnelvision

Frequently Asked Questions

What is GHSA-hqmp-g7ph-x543?
GHSA-hqmp-g7ph-x543 is a security vulnerability in Quincy involving TunnelVision - decloaking VPNs using DHCP under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Quincy versions are affected?
Affected versions include releases prior to current release patches across affected packages: quincy.
What version fixes GHSA-hqmp-g7ph-x543?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is quincy affected?
Yes, quincy is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of GHSA-hqmp-g7ph-x543?
GHSA-hqmp-g7ph-x543 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with GHSA-hqmp-g7ph-x543?
GHSA-hqmp-g7ph-x543 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check crates.io dependencies for GHSA-hqmp-g7ph-x543?
Run the dependency tree command: 'inspect dependencies for quincy'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hqmp-g7ph-x543",
  "modified" : "2025-05-19T20:43:55Z",
  "published" : "2024-12-27T18:12:47Z",
  "aliases" : [ ],
  "summary" : "TunnelVision - decloaking VPNs using DHCP",
  "details" : "A new decloaking technique for nearly all VPN implementations has been found, which allows attackers to inject entries into the routing tables of unsuspecting victims using DHCP option 121. This allows attackers to redirect traffic, which is supposed to be sent encrypted over the VPN, through the physical interface handling DHCP for the network the victim's computer is connected to, effectively bypassing the VPN connection.\n\n### Impact\nAll users are potentially affected, as this attack vector can be used against _any_ VPN implementation without mitigations in place.\n\n### Patches\nCurrently, there are no existing mitigations employed by Quincy.\n\n### Workarounds\nDisabling DHCP option 121 in the DHCP client is a potential workaround, as it prevents this kind of attack.\n\n### References\nhttps://www.leviathansecurity.com/blog/tunnelvision",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "quincy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.13.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/M0dEx/quincy/security/advisories/GHSA-hqmp-g7ph-x543"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-3661"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/M0dEx/quincy"
  }, {
    "type" : "WEB",
    "url" : "https://www.leviathansecurity.com/blog/tunnelvision"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-12-27T18:12:47Z",
    "nvd_published_at" : null
  }
}