Add vpatch-CVE-2021-23394 rule and test

.appsec-tests/vpatch-CVE-2021-23394/CVE-2021-23394.yaml

@@ -0,0 +1,19 @@
+## autogenerated on 2026-02-11 14:25:29
+id: CVE-2021-23394
+info:
+  name: CVE-2021-23394
+  author: crowdsec
+  severity: info
+  description: CVE-2021-23394 testing
+  tags: appsec-testing
+http:
+  - raw:
+      - |
+        GET /elFinder/php/connector.minimal.php?cmd=mkfile&target=l1_Lw&name=test.phar HTTP/1.1
+        Host: {{Hostname}}
+        Accept: application/json
+    cookie-reuse: true
+    matchers:
+    - type: status
+      status:
+       - 403

.appsec-tests/vpatch-CVE-2021-23394/config.yaml

@@ -0,0 +1,5 @@
+## autogenerated on 2026-02-11 14:25:29
+appsec-rules:
+  - ./appsec-rules/crowdsecurity/base-config.yaml
+  - ./appsec-rules/crowdsecurity/vpatch-CVE-2021-23394.yaml
+nuclei_template: CVE-2021-23394.yaml

appsec-rules/crowdsecurity/vpatch-CVE-2021-23394.yaml

@@ -0,0 +1,43 @@
+## autogenerated on 2026-02-11 14:25:29
+name: crowdsecurity/vpatch-CVE-2021-23394
+description: 'Detects creation of .phar files via elFinder connector, which may lead to remote code execution if parsed as PHP.'
+rules:
+  - and:
+      - zones:
+          - URI
+        transform:
+          - lowercase
+        match:
+          type: contains
+          value: /elfinder/php/connector.minimal.php
+      - zones:
+          - ARGS
+        variables:
+          - name
+        transform:
+          - lowercase
+          - urldecode
+        match:
+          type: endsWith
+          value: .phar
+      - zones:
+          - ARGS
+        variables:
+          - cmd
+        transform:
+          - lowercase
+        match:
+          type: equals
+          value: mkfile
+
+labels:
+  type: exploit
+  service: http
+  confidence: 3
+  spoofable: 0
+  behavior: 'http:exploit'
+  label: 'ElFinder - RCE'
+  classification:
+    - cve.CVE-2021-23394
+    - attack.T1190
+    - cwe.CWE-434

collections/crowdsecurity/appsec-virtual-patching.yaml

@@ -97,6 +97,7 @@ appsec-rules:
 - crowdsecurity/vpatch-CVE-2021-43798
 - crowdsecurity/vpatch-CVE-2022-1388
 - crowdsecurity/vpatch-CVE-2021-26294
+- crowdsecurity/vpatch-CVE-2021-23394
 - crowdsecurity/vpatch-CVE-2002-1131
 - crowdsecurity/vpatch-CVE-2023-0297
 - crowdsecurity/vpatch-CVE-2007-0885