CVE-2026-24904

{"id": "CVE-2026-24904", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-24904", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-29T21:34:05.106512Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "TrustTunnel", "product": "TrustTunnel", "versions": [{"status": "affected", "version": "< 0.9.115"}]}]}], "published": "2026-01-29T22:15:55.047", "references": [{"url": "https://github.com/TrustTunnel/TrustTunnel/commit/aa5060145506952b9431b0ed3edb52bb6c08d9a6", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/TrustTunnel/TrustTunnel/security/advisories/GHSA-fqh7-r5gf-3r87", "tags": ["Exploit", "Patch", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-284"}]}], "descriptions": [{"lang": "en", "value": "TrustTunnel is an open-source VPN protocol with a rule bypass issue in versions prior to 0.9.115. In `tls_listener.rs`, `TlsListener::listen()` peeks 1024 bytes and calls `extract_client_random(...)`. If `parse_tls_plaintext` fails (for example, a fragmented/partial ClientHello split across TCP writes), `extract_client_random` returns `None`. In `rules.rs`, `RulesEngine::evaluate` only evaluates `client_random_prefix` when `client_random` is `Some(...)`. As a result, when extraction fails (`client_random == None`), any rule that relies on `client_random_prefix` matching is skipped and evaluation falls through to later rules. As an important semantics note: `client_random_prefix` is a match condition only. It does not mean \"block non-matching prefixes\" by itself. A rule with `client_random_prefix = ...` triggers its `action` only when the prefix matches (and the field is available to evaluate). Non-matches (or `None`) simply do not match that rule and continue to fall through. The vulnerability is fixed in version 0.9.115."}, {"lang": "es", "value": "TrustTunnel es un protocolo VPN de c\u00f3digo abierto con un problema de omisi\u00f3n de reglas en versiones anteriores a la 0.9.115. En `tls_listener.rs`, `TlsListener::listen()` examina 1024 bytes y llama a `extract_client_random(...)`. Si `parse_tls_plaintext` falla (por ejemplo, un ClientHello fragmentado/parcial dividido en varias escrituras TCP), `extract_client_random` devuelve `None`. En `rules.rs`, `RulesEngine::evaluate` solo eval\u00faa `client_random_prefix` cuando `client_random` es `Some(...)`. Como resultado, cuando la extracci\u00f3n falla (`client_random == None`), cualquier regla que dependa de la coincidencia de `client_random_prefix` se omite y la evaluaci\u00f3n pasa a reglas posteriores. Como una nota sem\u00e1ntica importante: `client_random_prefix` es solo una condici\u00f3n de coincidencia. No significa 'bloquear prefijos no coincidentes' por s\u00ed mismo. Una regla con `client_random_prefix = ...` activa su `acci\u00f3n` solo cuando el prefijo coincide (y el campo est\u00e1 disponible para evaluar). Las no-coincidencias (o `None`) simplemente no coinciden con esa regla y contin\u00faan pasando. La vulnerabilidad est\u00e1 corregida en la versi\u00f3n 0.9.115."}], "lastModified": "2026-06-17T10:23:47.003", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:adguard:trusttunnel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "08F7E28C-244F-4FAE-9EDF-127191A1FED8", "versionEndExcluding": "0.9.115"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}