Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities - Nessus

High   Plugin ID: 153884

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This page contains detailed information about the Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Plugin Overview

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ID: 153884
Name: Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities
Filename: apache_2_4_50.nasl
Vulnerability Published: 2021-10-04
This Plugin Published: 2021-10-05
Last Modification Time: 2022-04-11
Plugin Version: 1.12
Plugin Type: combined
Plugin Family: Web Servers
Dependencies: apache_httpd_win_installed.nbin, apache_http_server_nix_installed.nbin, apache_http_version.nasl
Required KB Items [?]: installed_sw/Apache

Vulnerability Information

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Severity: High
Vulnerability Published: 2021-10-04
Patch Published: 2021-10-04
CVE [?]: CVE-2021-41524, CVE-2021-41773
CPE [?]: cpe:/a:apache:httpd, cpe:/a:apache:http_server

Synopsis

The remote web server is affected by multiple vulnerabilities.

Description

The version of Apache httpd installed on the remote host is 2.4.49. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.50 advisory.

- While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request processing, allowing an external source to DoS the server. This requires a specially crafted request. The vulnerability was recently introduced in version 2.4.49. No exploit is known to the project. (CVE-2021-41524)

- A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. 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. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions. (CVE-2021-41773)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Apache version 2.4.50 or later.

Public Exploits

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Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB, GitHub)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities vulnerability:

1. Metasploit: auxiliary/scanner/http/apache_normalize_path
   [Apache 2.4.49/2.4.50 Traversal RCE]
2. Metasploit: exploit/multi/http/apache_normalize_path_rce
   [Apache 2.4.49/2.4.50 Traversal RCE]
3. Metasploit: auxiliary/scanner/http/apache_normalize_path
   [Apache 2.4.49/2.4.50 Traversal RCE scanner]
4. Exploit-DB: exploits/multiple/webapps/50383.sh
   [EDB-50383: Apache HTTP Server 2.4.49 - Path Traversal & Remote Code Execution (RCE)]
5. Exploit-DB: exploits/multiple/webapps/50512.py
   [EDB-50512: Apache HTTP Server 2.4.50 - Remote Code Execution (RCE) (3)]
6. GitHub: https://github.com/0day666/Vulnerability-verification
   [CVE-2021-41773]
7. GitHub: https://github.com/0e0w/GoHackTools
   [CVE-2021-41773]
8. GitHub: https://github.com/0x3n0/redeam
   [CVE-2021-41773]
9. GitHub: https://github.com/0xsyr0/OSCP
   [CVE-2021-41773]
10. GitHub: https://github.com/AkshayraviC09YC47/CVE-Exploits
    [CVE-2021-41773]
11. GitHub: https://github.com/BabyTeam1024/CVE-2021-41773
    [CVE-2021-41773]
12. GitHub: https://github.com/BincangSiber/CVE-2021-41773
    [CVE-2021-41773]
13. GitHub: https://github.com/BlueTeamSteve/CVE-2021-41773
    [CVE-2021-41773]
14. GitHub: https://github.com/CHYbeta/Vuln100Topics20
    [CVE-2021-41773]
15. GitHub: https://github.com/Chocapikk/CVE-2021-41773
    [CVE-2021-41773]
16. GitHub: https://github.com/ComdeyOverFlow/CVE-2021-41773
    [CVE-2021-41773]
17. GitHub: https://github.com/ComdeyOverflow/CVE-2021-41773
    [CVE-2021-41773]
18. GitHub: https://github.com/DoTuan1/Reserch-CVE-2021-41773
    [CVE-2021-41773]
19. GitHub: https://github.com/FDlucifer/firece-fish
    [CVE-2021-41773]
20. GitHub: https://github.com/Fa1c0n35/CVE-2021-41773
    [CVE-2021-41773]
21. GitHub: https://github.com/H0j3n/EzpzCheatSheet
    [CVE-2021-41773]
22. GitHub: https://github.com/H0j3n/EzpzShell
    [CVE-2021-41773]
23. GitHub: https://github.com/HxDDD/CVE-PoC
    [CVE-2021-41773]
24. GitHub: https://github.com/KAB8345/CVE-2021-41773
    [CVE-2021-41773]
25. GitHub: https://github.com/LayarKacaSiber/CVE-2021-41773
    [CVE-2021-41773]
26. GitHub: https://github.com/LetouRaphael/Poc-CVE-2021-41773
    [CVE-2021-41773]
27. GitHub: https://github.com/MazX0p/CVE-2021-41773
    [CVE-2021-41773]
28. GitHub: https://github.com/Ming119/CVE-2021-41773_Exploit
    [CVE-2021-41773]
29. GitHub: https://github.com/Mr-xn/Penetration_Testing_POC
    [CVE-2021-41773]
30. GitHub: https://github.com/N0el4kLs/Vulhub_Exp
    [CVE-2021-41773]
31. GitHub: https://github.com/N3w-elf/CVE-2021-41773-
    [CVE-2021-41773]
32. GitHub: https://github.com/Shadow-warrior0/Apache_path_traversal
    [CVE-2021-41773]
33. GitHub: https://github.com/TAI-REx/cve-2021-41773-nse
    [CVE-2021-41773]
34. GitHub: https://github.com/TishcaTpx/cve-2021-41773-nse
    [CVE-2021-41773: CVE-2021-41773.nse]
35. GitHub: https://github.com/WynSon/CVE-2021-41773
    [CVE-2021-41773]
36. GitHub: https://github.com/ZephrFish/CVE-2021-41773-PoC
    [CVE-2021-41773]
37. GitHub: https://github.com/ahmad4fifz/docker-cve-2021-41773
    [CVE-2021-41773]
38. GitHub: https://github.com/anonsecteaminc/CVE-2021-41773-PoC
    [CVE-2021-41773: CVE-2021-41773-PoC]
39. GitHub: https://github.com/asaotomo/CVE-2021-42013-Apache-RCE-POC-EXP
    [CVE-2021-41773: Apache HTTP ...]
40. GitHub: https://github.com/asaotomo/CVE-2021-42013-Apache-RCE-Poc-Exp
    [CVE-2021-41773: Apache 远程代码执行 （CVE-2021-42013）批量检测工具：Apache HTTP ...]
41. GitHub: https://github.com/bernardas/netsec-polygon
    [CVE-2021-41773: Environment for CVE-2021-41773 recreation.]
42. GitHub: https://github.com/binganao/vulns-2022
    [CVE-2021-41773]
43. GitHub: https://github.com/byteofjoshua/CVE-2021-41773
    [CVE-2021-41773]
44. GitHub: https://github.com/capdegarde/apache_path_traversal
    [CVE-2021-41773]
45. GitHub: https://github.com/cgddgc/CVE-2021-41773-42013
    [CVE-2021-41773]
46. GitHub: https://github.com/cisagov/Malcolm
    [CVE-2021-41773]
47. GitHub: https://github.com/creadpag/cve-2021-41773-nse
    [CVE-2021-41773: CVE-2021-41773.nse]
48. GitHub: https://github.com/cryst4lliz3/CVE-2021-41773
    [CVE-2021-41773]
49. GitHub: https://github.com/fardeen-ahmed/Bug-bounty-Writeups
    [CVE-2021-41773]
50. GitHub: https://github.com/fnatalucci/CVE-2021-41773-RCE
    [CVE-2021-41773]
51. GitHub: https://github.com/hackingyseguridad/nmap
    [CVE-2021-41773]
52. GitHub: https://github.com/honypot/CVE-2021-41773
    [CVE-2021-41773]
53. GitHub: https://github.com/htrgouvea/lab-cve-2021-41773
    [CVE-2021-41773: Docker container lab to play/learn with CVE-2021-41773]
54. GitHub: https://github.com/htrgouvea/research
    [CVE-2021-41773]
55. GitHub: https://github.com/i6c/MASS_CVE-2021-41773
    [CVE-2021-41773]
56. GitHub: https://github.com/iilegacyyii/PoC-CVE-2021-41773
    [CVE-2021-41773]
57. GitHub: https://github.com/jhye0n/CVE-2021-41773
    [CVE-2021-41773: CVE-2021-41773 Test Page & Exploit Code]
58. GitHub: https://github.com/kubota/POC-CVE-2021-41773
    [CVE-2021-41773]
59. GitHub: https://github.com/lorddemon/CVE-2021-41773-PoC
    [CVE-2021-41773]
60. GitHub: https://github.com/lsass-exe/CVE-2021-41773
    [CVE-2021-41773]
61. GitHub: https://github.com/ltfafei/my_POC
    [CVE-2021-41773]
62. GitHub: https://github.com/luck-ying/Library-POC
    [CVE-2021-41773]
63. GitHub: https://github.com/m96dg/CVE-2021-41773-exercise
    [CVE-2021-41773: A flaw was found in a change made to path normalization in Apache HTTP Server ...]
64. GitHub: https://github.com/m96dg/vulnerable_docker_apache_2_4_49
    [CVE-2021-41773]
65. GitHub: https://github.com/mahtin/unix-v7-uucp-chkpth-bug
    [CVE-2021-41773]
66. GitHub: https://github.com/masahiro331/CVE-2021-41773
    [CVE-2021-41773]
67. GitHub: https://github.com/meicookies/cve-2021-41773_2021-42013
    [CVE-2021-41773: mass scan for apache 2.4.49/2.4.50]
68. GitHub: https://github.com/mohwahyudi/cve-2021-41773
    [CVE-2021-41773]
69. GitHub: https://github.com/norrig/CVE-2021-41773-exploiter
    [CVE-2021-41773: School project - Please use other repos for actual testing]
70. GitHub: https://github.com/oxctdev/CVE-2021-41773
    [CVE-2021-41773: Apache HTTPd (2.4.49) – Local File Disclosure (LFI)]
71. GitHub: https://github.com/pisut4152/Sigma-Rule-for-CVE-2021-41773-and-CVE-2021-42013-exploitation-attempt
    [CVE-2021-41773]
72. GitHub: https://github.com/puckiestyle/CVE-2021-41773
    [CVE-2021-41773]
73. GitHub: https://github.com/qwutony/CVE-2021-41773
    [CVE-2021-41773]
74. GitHub: https://github.com/r00tVen0m/CVE-2021-41773
    [CVE-2021-41773]
75. GitHub: https://github.com/ranggaggngntt/CVE-2021-41773
    [CVE-2021-41773]
76. GitHub: https://github.com/shiomiyan/CVE-2021-41773
    [CVE-2021-41773]
77. GitHub: https://github.com/signorrayan/RedTeam_toolkit
    [CVE-2021-41773]
78. GitHub: https://github.com/skentagon/CVE-2021-41773
    [CVE-2021-41773]
79. GitHub: https://github.com/spiderz0ne/CVE-2021-41773
    [CVE-2021-41773]
80. GitHub: https://github.com/the29a/CVE-2021-41773
    [CVE-2021-41773: Small PoC of CVE-2021-41773]
81. GitHub: https://github.com/thehackersbrain/CVE-2021-41773
    [CVE-2021-41773: Apache2 2.4.49 - LFI & RCE Exploit - CVE-2021-41773]
82. GitHub: https://github.com/twseptian/CVE-2021-42013-Docker-Lab
    [CVE-2021-41773]
83. GitHub: https://github.com/vuongnv3389-sec/cve-2021-41773
    [CVE-2021-41773]
84. GitHub: https://github.com/xMohamed0/CVE-2021-41773
    [CVE-2021-41773]
85. GitHub: https://github.com/0xAlmighty/CVE-2021-41773-PoC
    [CVE-2021-41773: Path Traversal and RCE in Apache HTTP Server 2.4.49]
86. GitHub: https://github.com/0xRar/CVE-2021-41773
    [CVE-2021-41773: Exploit for Apache 2.4.49]
87. GitHub: https://github.com/1nhann/CVE-2021-41773
    [CVE-2021-41773: CVE-2021-41773 的复现]
88. GitHub: https://github.com/5gstudent/cve-2021-41773-and-cve-2021-42013
    [CVE-2021-41773: cve-2021-41773 即 cve-2021-42013 批量检测脚本]
89. GitHub: https://github.com/ahmad4fifz/CVE-2021-41773
    [CVE-2021-41773: CVE-2021-41773 on Docker]
90. GitHub: https://github.com/ahmad4fifz/CVE-2021-42013
    [CVE-2021-41773: CVE-2021-41773 on Docker]
91. GitHub: https://github.com/apapedulimu/Apachuk
    [CVE-2021-41773: CVE-2021-41773 Grabber]
92. GitHub: https://github.com/AssassinUKG/CVE-2021-41773
    [CVE-2021-41773: Apache 2.4.49]
93. GitHub: https://github.com/b1tsec/CVE-2021-41773
    [CVE-2021-41773: A Python script to check if an Apache web server is vulnerable to CVE-2021-41773]
94. GitHub: https://github.com/Balgogan/CVE-2021-41773
    [CVE-2021-41773: Ce programme permet de détecter une faille RCE sur les serveurs Apache 2.4.49 et ...]
95. GitHub: https://github.com/blasty/CVE-2021-41773
    [CVE-2021-41773: CVE-2021-41773 playground]
96. GitHub: https://github.com/CalfCrusher/Path-traversal-RCE-Apache-2.4.49-2.4.50-Exploit
    [CVE-2021-41773: CVE-2021-41773 | CVE-2021-42013 Exploit Tool (Apache/2.4.49-2.4.50)]
97. GitHub: https://github.com/cloudbyteelias/CVE-2021-41773
    [CVE-2021-41773: CVE-2021-41773 Docker lab]
98. GitHub: https://github.com/corelight/CVE-2021-41773
    [CVE-2021-41773: A Zeek package which raises notices for Path Traversal/RCE in Apache HTTP Server ...]
99. GitHub: https://github.com/creadpag/CVE-2021-41773-POC
    [CVE-2021-41773]
100. GitHub: https://github.com/EagleTube/CVE-2021-41773
     [CVE-2021-41773: Apache 2.4.49 Path Traversal Vulnerability Checker]
101. GitHub: https://github.com/habibiefaried/CVE-2021-41773-PoC
     [CVE-2021-41773: PoC for CVE-2021-41773 with docker to demonstrate]
102. GitHub: https://github.com/HightechSec/scarce-apache2
     [CVE-2021-41773: A framework for bug hunting or pentesting targeting websites that have ...]
103. GitHub: https://github.com/Hydragyrum/CVE-2021-41773-Playground
     [CVE-2021-41773: Some docker images to play with CVE-2021-41773 and CVE-2021-42013]
104. GitHub: https://github.com/IcmpOff/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution-Exploit
     [CVE-2021-41773: This Metasploit module exploits an unauthenticated remote code execution ...]
105. GitHub: https://github.com/im-hanzou/apachrot
     [CVE-2021-41773: Apache CVE-2021-41773/2021-42013 Mass Vulnerability Checker]
106. GitHub: https://github.com/inbug-team/CVE-2021-41773_CVE-2021-42013
     [CVE-2021-41773: CVE-2021-41773 CVE-2021-42013漏洞批量检测工具]
107. GitHub: https://github.com/itsecurityco/CVE-2021-41773
     [CVE-2021-41773: CVE-2021-41773 POC with Docker]
108. GitHub: https://github.com/jbovet/CVE-2021-41773
     [CVE-2021-41773: Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49 ...]
109. GitHub: https://github.com/jheeree/Simple-CVE-2021-41773-checker
     [CVE-2021-41773: Simple script realizado en bash, para revisión de múltiples hosts para ...]
110. GitHub: https://github.com/justakazh/mass_cve-2021-41773
     [CVE-2021-41773: MASS CVE-2021-41773]
111. GitHub: https://github.com/knqyf263/CVE-2021-41773
     [CVE-2021-41773: Path traversal in Apache HTTP Server 2.4.49 (CVE-2021-41773)]
112. GitHub: https://github.com/ksanchezcld/httpd-2.4.49
     [CVE-2021-41773: Critical: Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and ...]
113. GitHub: https://github.com/lopqto/CVE-2021-41773_Honeypot
     [CVE-2021-41773: Simple honeypot for CVE-2021-41773 vulnerability]
114. GitHub: https://github.com/Ls4ss/CVE-2021-41773_CVE-2021-42013
     [CVE-2021-41773: Apache HTTP Server 2.4.49, 2.4.50 - Path Traversal & RCE]
115. GitHub: https://github.com/LudovicPatho/CVE-2021-41773
     [CVE-2021-41773: The first vulnerability with the CVE identifier CVE-2021-41773 is a path traversal ...]
116. GitHub: https://github.com/mauricelambert/CVE-2021-41773
     [CVE-2021-41773: These Metasploit, Nmap, Python and Ruby scripts detects and exploits CVE-2021-41773 ...]
117. GitHub: https://github.com/MrCl0wnLab/SimplesApachePathTraversal
     [CVE-2021-41773: Tool check: CVE-2021-41773, CVE-2021-42013, CVE-2020-17519]
118. GitHub: https://github.com/mr-exo/CVE-2021-41773
     [CVE-2021-41773: Remote Code Execution exploit for Apache servers. Affected versions: Apache 2.4.49, ...]
119. GitHub: https://github.com/n3k00n3/CVE-2021-41773
     [CVE-2021-41773: exploit to CVE-2021-41773]
120. GitHub: https://github.com/numanturle/CVE-2021-41773
     [CVE-2021-41773]
121. GitHub: https://github.com/PentesterGuruji/CVE-2021-41773
     [CVE-2021-41773: Path Traversal vulnerability in Apache 2.4.49]
122. GitHub: https://github.com/RyouYoo/CVE-2021-41773
     [CVE-2021-41773: Exploitation of CVE-2021-41773 a Directory Traversal in Apache 2.4.49.]
123. GitHub: https://github.com/Sakura-nee/CVE-2021-41773
     [CVE-2021-41773: Mass exploitation CVE-2021-41773 and auto detect possible RCE]
124. GitHub: https://github.com/scarmandef/CVE-2021-41773
     [CVE-2021-41773: Apache HTTP Server 2.4.49, 2.4.50 - Path Traversal & RCE]
125. GitHub: https://github.com/superzerosec/CVE-2021-41773
     [CVE-2021-41773: POC]
126. GitHub: https://github.com/TheLastVvV/CVE-2021-41773
     [CVE-2021-41773: Poc CVE 2021-41773 - Apache 2.4.49 with CGI enabled]
127. GitHub: https://github.com/TishcaTpx/POC-CVE-2021-41773
     [CVE-2021-41773: Poc.py]
128. GitHub: https://github.com/twseptian/CVE-2021-41773
     [CVE-2021-41773: CVE-2021-41773: Path Traversal Zero-Day in Apache HTTP Server Exploited]
129. GitHub: https://github.com/vida00/Scanner-CVE-2021-41773
     [CVE-2021-41773: A automatic scanner to apache 2.4.49]
130. GitHub: https://github.com/vinhjaxt/CVE-2021-41773-exploit
     [CVE-2021-41773: CVE-2021-41773, poc, exploit]
131. GitHub: https://github.com/vulf/CVE-2021-41773_42013
     [CVE-2021-41773: Lab setup for CVE-2021-41773 (Apache httpd 2.4.49) and CVE-2021-42013 (Apache httpd ...]
132. GitHub: https://github.com/Vulnmachines/cve-2021-41773
     [CVE-2021-41773: CVE-2021-41773 Path Traversal vulnerability in Apache 2.4.49.]
133. GitHub: https://github.com/wangfly-me/Apache_Penetration_Tool
     [CVE-2021-41773: CVE-2021-41773&CVE-2021-42013图形化漏洞检测利用工具]
134. GitHub: https://github.com/wolf1892/CVE-2021-41773
     [CVE-2021-41773: Setup vulnerable enviornment]
135. GitHub: https://github.com/zeronine9/CVE-2021-41773
     [CVE-2021-41773: Fast python tool to test apache path traversal CVE-2021-41773 in a List of url]
136. GitHub: https://github.com/shellreaper/CVE-2021-41773
     [CVE-2021-41773: This is a simple POC for Apache/2.4.49 Path Traversal Vulnerability]
137. GitHub: https://github.com/theLSA/apache-httpd-path-traversal-checker
     [CVE-2021-41773: Apache httpd path traversal checker(CVE-2021-41773 / CVE-2021-42013)]
138. GitHub: https://github.com/walnutsecurity/cve-2021-41773
     [CVE-2021-41773: Cve-2021-41773.py is a python script that will help in finding Path Traversal or ...]
139. GitHub: https://github.com/Zeop-CyberSec/apache_normalize_path
     [CVE-2021-41773: Metasploit-Framework modules (scanner and exploit) for the CVE-2021-41773 and ...]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

---

CVSS Score Source [?]: CVE-2021-41773
CVSS V2 Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N/E:H/RL:OF/RC:C

CVSS Base Score:	4.3 (Medium)
Impact Subscore:	2.9
Exploitability Subscore:	8.6
CVSS Temporal Score:	3.7 (Low)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	3.7 (Low)

CVSS V3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C

CVSS Base Score:	7.5 (High)
Impact Subscore:	3.6
Exploitability Subscore:	3.9
CVSS Temporal Score:	7.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.2 (High)

STIG Severity [?]: II
STIG Risk Rating: Medium

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Plugin Source

---

This is the apache_2_4_50.nasl nessus plugin source code. This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(153884);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2021-41524", "CVE-2021-41773");
  script_xref(name:"IAVA", value:"2021-A-0451-S");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2021/11/17");

  script_name(english:"Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Apache httpd installed on the remote host is 2.4.49. It is, therefore, affected by multiple
vulnerabilities as referenced in the 2.4.50 advisory.

  - While fuzzing the 2.4.49 httpd, a new null pointer dereference was detected during HTTP/2 request
    processing, allowing an external source to DoS the server. This requires a specially crafted request. The
    vulnerability was recently introduced in version 2.4.49. No exploit is known to the project.
    (CVE-2021-41524)

  - A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. 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. This issue is known to be exploited in
    the wild. This issue only affects Apache 2.4.49 and not earlier versions. (CVE-2021-41773)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://httpd.apache.org/security/vulnerabilities_24.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Apache version 2.4.50 or later.");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-41773");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Apache 2.4.49/2.4.50 Traversal RCE');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/10/05");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:httpd");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:http_server");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

  script_copyright(english:"This script is Copyright (C) 2021-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("apache_http_version.nasl", "apache_http_server_nix_installed.nbin", "apache_httpd_win_installed.nbin");
  script_require_keys("installed_sw/Apache");

  exit(0);
}

include('vcf.inc');
include('vcf_extras.inc');

var app_info = vcf::apache_http_server::combined_get_app_info(app:'Apache');

var constraints = [
  { 'min_version':'2.4.49', 'fixed_version' : '2.4.50' }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);

The latest version of this script can be found in these locations depending on your platform:

• Linux / Unix:
  /opt/nessus/lib/nessus/plugins/apache_2_4_50.nasl
• Windows:
  C:\ProgramData\Tenable\Nessus\nessus\plugins\apache_2_4_50.nasl
• Mac OS X:
  /Library/Nessus/run/lib/nessus/plugins/apache_2_4_50.nasl

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How to Run

---

Here is how to run the Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

1. Click to start a New Scan.
2. Select Advanced Scan.
3. Navigate to the Plugins tab.
4. On the top right corner click to Disable All plugins.
5. On the left side table select Web Servers plugin family.
6. On the right side table select Apache 2.4.49 < 2.4.50 Multiple Vulnerabilities plugin ID 153884.
7. Specify the target on the Settings tab and click to Save the scan.
8. Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl apache_2_4_50.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a apache_2_4_50.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - apache_2_4_50.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state apache_2_4_50.nasl -t <IP/HOST>

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References

---

IAVA | Information Assurance Vulnerability Alert:

• 2021-A-0451-S

See also:

• https://www.tenable.com/plugins/nessus/153884
• https://httpd.apache.org/security/vulnerabilities_24.html
• https://vulners.com/nessus/APACHE_2_4_50.NASL

Similar and related Nessus plugins:

• 154179 - Amazon Linux 2 : httpd (ALAS-2021-1716)
• 154188 - Amazon Linux AMI : httpd24 (ALAS-2021-1543)
• 153885 - Apache HTTP Server 2.4.49 Path Traversal (CVE-2021-41773)
• 153894 - FreeBSD : Apache httpd -- Multiple vulnerabilities (25b78bdd-25b8-11ec-a341-d4c9ef517024)

Version

---

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file apache_2_4_50.nasl version 1.12. For more plugins, visit the Nessus Plugin Library.

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