Add GHSA-5469-xxr8-3chv: Crynux Node Missing Authentication / Private Key Exposure (CRITICAL 9.8)

advisories/github-reviewed/2026/07/GHSA-5469-xxr8-3chv.json

@@ -0,0 +1,55 @@
+{
+  "schema_version": "1.5.0",
+  "id": "GHSA-5469-xxr8-3chv",
+  "modified": "2026-07-25T00:00:00Z",
+  "published": "2026-07-25T00:00:00Z",
+  "summary": "Missing Authentication + Permissive CORS Enables Remote Private Key Theft in Crynux Node",
+  "details": "The Crynux Node WebUI (FastAPI server on port 7412) has no authentication on any API endpoint and uses permissive CORS (allow_origins=[\"*\"] with allow_credentials=True). This allows any website to silently extract the node operator's private key and replace it with an attacker's key via cross-origin JavaScript.\n\nVulnerable endpoints:\n- POST /manager/v1/account \u2014 returns full private key in response\n- PUT /manager/v1/account \u2014 replaces key with no authentication\n- GET /manager/v1/system \u2014 exposes system info\n- GET /manager/v1/account \u2014 exposes wallet address, balance\n\nAttack chain:\n1. Victim visits any website containing attacker-controlled JavaScript\n2. JS sends POST to localhost:7412/manager/v1/account (no auth, CORS allows)\n3. Response contains full private key\n4. JS sends PUT to replace key with attacker's key\n5. All future mining earnings redirected to attacker\n\nCVSS: 9.8 CRITICAL (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H)\nCWE: CWE-306 (Missing Authentication), CWE-942 (Permissive Cross-domain Policy)",
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "PyPI",
+        "name": "crynux-node"
+      },
+      "ranges": [
+        {
+          "type": "SEMVER",
+          "events": [
+            {
+              "introduced": "0"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/crynux-network/crynux-node/issues/430"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/crynux-network/crynux-node/blob/main/src/crynux_server/server/middleware.py"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/crynux-network/crynux-node/blob/main/src/crynux_server/server/v1/account.py"
+    }
+  ],
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-306",
+      "CWE-942"
+    ],
+    "severity": "CRITICAL",
+    "github_reviewed": false,
+    "github_reviewed_at": null
+  }
+}