Add vpatch-CVE-2025-31161 rule and test

.appsec-tests/vpatch-CVE-2025-31161/CVE-2025-31161.yaml

@@ -0,0 +1,20 @@
+## autogenerated on 2025-05-09 09:48:32
+id: CVE-2025-31161
+info:
+  name: CVE-2025-31161
+  author: crowdsec
+  severity: info
+  description: CVE-2025-31161 testing
+  tags: appsec-testing
+http:
+  - raw:
+      - |
+        GET /WebInterface/function/?command=getUserList&serverGroup=MainUsers&c2f=1234 HTTP/1.1
+        Cookie: CrushAuth=1234567890123_abcdefghijklmnopqrstuvwxyz1234; currentAuth=1234
+        Host: {{Hostname}}
+        Authorization: AWS4-HMAC-SHA256 Credential=crushadmin/
+    cookie-reuse: true
+    matchers:
+    - type: status
+      status:
+       - 403

.appsec-tests/vpatch-CVE-2025-31161/config.yaml

@@ -0,0 +1,5 @@
+## autogenerated on 2025-05-09 09:48:32
+appsec-rules:
+  - ./appsec-rules/crowdsecurity/base-config.yaml
+  - ./appsec-rules/crowdsecurity/vpatch-CVE-2025-31161.yaml
+nuclei_template: CVE-2025-31161.yaml

appsec-rules/crowdsecurity/vpatch-CVE-2025-31161.yaml

@@ -0,0 +1,42 @@
+## autogenerated on 2025-05-09 09:48:32
+name: crowdsecurity/vpatch-CVE-2025-31161
+description: 'Detects authentication bypass in CrushFTP via crafted Authorization header and specific endpoint.'
+rules:
+  - and:
+      - zones:
+          - URI
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: /webinterface/function/
+      - zones:
+          - ARGS
+        variables:
+          - command
+        transform:
+          - lowercase
+        match:
+          type: equals
+          value: getuserlist
+      - zones:
+          - HEADERS
+        variables:
+          - authorization
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: aws4-hmac-sha256 credential=crushadmin/
+
+labels:
+  type: exploit
+  service: http
+  confidence: 3
+  spoofable: 0
+  behavior: 'http:exploit'
+  label: 'CrushFTP - Authentication Bypass'
+  classification:
+    - cve.CVE-2025-31161
+    - attack.T1190
+    - cwe.CWE-287

collections/crowdsecurity/appsec-virtual-patching.yaml

@@ -90,6 +90,7 @@ appsec-rules:
 - crowdsecurity/vpatch-CVE-2024-27292
 - crowdsecurity/vpatch-CVE-2025-24893
 - crowdsecurity/vpatch-CVE-2021-43798
+- crowdsecurity/vpatch-CVE-2025-31161
 author: crowdsecurity
 contexts:
 - crowdsecurity/appsec_base