Security readout for executives and security teams
Plain-English summary
TrustTunnel versions before 0.9.115 can fail to enforce rules based on TLS client random prefixes when the initial TLS handshake data is partial or fragmented. In that case, the matching rule may be skipped and later rules may decide access. This is a policy bypass risk, not documented as remote code execution.
Executive priority
Prioritize remediation where TrustTunnel protects sensitive routes or access decisions using client_random_prefix. The issue is moderate severity, remotely triggerable, and fixed. Treat it as a configuration-dependent policy bypass rather than a broad infrastructure compromise.
Technical view
In TrustTunnel tls_listener.rs, TlsListener::listen() peeks 1024 bytes and calls extract_client_random(). If TLS plaintext parsing fails, client_random becomes None. RulesEngine::evaluate only checks client_random_prefix when client_random is present, so prefix-based rules are skipped on extraction failure and evaluation falls through. Fixed in 0.9.115.
Likely exposure
Exposure is limited to TrustTunnel deployments before 0.9.115 that rely on client_random_prefix rules for routing, filtering, or access decisions. Deployments not using those rule conditions are less directly affected based on the provided advisory.
Exploitation context
The CVE is network-reachable with no privileges or user interaction per CVSS. The source bundle does not report active exploitation, and KEV is false. Exploitation depends on causing client_random extraction to fail so prefix-dependent rules are not evaluated.
Researcher notes
Important semantics: client_random_prefix is only a match condition. It does not block non-matching prefixes by itself. When client_random is None, that condition is not evaluated and the rule does not match. Assess real impact by examining subsequent rules and their actions.
Mitigation direction
- Upgrade TrustTunnel to version 0.9.115 or later.
- Review rules that depend on client_random_prefix for security-sensitive decisions.
- Check the GitHub advisory for any additional vendor guidance.
- Avoid relying on client_random_prefix as the sole access-control condition until upgraded.
Validation and detection
- Inventory TrustTunnel instances and confirm installed versions.
- Identify configurations using client_random_prefix rules.
- Confirm upgraded systems report version 0.9.115 or later.
- Review logs and rule behavior for unexpected fall-through decisions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-284: Authorization and privilege behavior lookup
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Open ATT&CK lookupCVE-2026-24904 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/TrustTunnel/TrustTunnel/security/advisories/GHSA-fqh7-r5gf-3r87CVE reference · x_refsource_CONFIRM
- https://github.com/TrustTunnel/TrustTunnel/commit/aa5060145506952b9431b0ed3edb52bb6c08d9a6CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.