CVE-2021-42013

Apache HTTP Server Path Traversal Vulnerability

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

Act

*SSVC

Descriptions

It was found that the fix for CVE-2021-41773 in Apache HTTP Server 2.4.50 was insufficient. An attacker could use a path traversal attack to map URLs to files outside the directories configured by Alias-like directives. If files outside of these directories are not protected by the usual default configuration "require all denied", these requests can succeed. If CGI scripts are also enabled for these aliased pathes, this could allow for remote code execution. This issue only affects Apache 2.4.49 and Apache 2.4.50 and not earlier versions.

Se ha detectado que la corrección de CVE-2021-41773 en Apache HTTP Server versión 2.4.50 no era suficiente. Un atacante podía usar un ataque de salto de ruta para asignar URLs a archivos fuera de los directorios configurados por las directivas tipo Alias. Si los archivos fuera de estos directorios no están protegidos por la configuración habitual por defecto "require all denied", estas peticiones pueden tener éxito. Si los scripts CGI también están habilitados para estas rutas alias, esto podría permitir una ejecución de código remota . Este problema sólo afecta a Apache versión 2.4.49 y Apache versión 2.4.50 y no a versiones anteriores

Multiple vulnerabilities have been discovered in Apache Webserver, the worst of which could result in remote code execution. Versions less than 2.4.54 are affected.

Apache HTTP Server contains a path traversal vulnerability that allows an attacker to perform remote code execution if files outside directories configured by Alias-like directives are not under default require all denied or if CGI scripts are enabled. This CVE ID resolves an incomplete patch for CVE-2021-41773.

*Credits: Reported by Juan Escobar from Dreamlab Technologies, Fernando Muñoz from NULL Life CTF Team, and Shungo Kumasaka

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Act

Exploitation

Active

Automatable

Yes

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2021-10-06 CVE Reserved
2021-10-07 CVE Published
2021-10-08 First Exploit
2021-11-03 Exploited in Wild
2021-11-17 KEV Due Date
2025-02-04 CVE Updated
2025-03-18 EPSS Updated

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CAPEC

References (74)

URL	Tag	Source
http://jvn.jp/en/jp/JVN51106450/index.html	Third Party Advisory
http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html	Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/10/07/6	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/08/1	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/08/2	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/08/3	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/08/4	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/08/5	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/08/6	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/09/1	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/11/4	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/15/3	Mailing List
http://www.openwall.com/lists/oss-security/2021/10/16/1	Mailing List
https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E	Mailing List
https://security.netapp.com/advisory/ntap-20211029-0009	Third Party Advisory
https://github.com/RootUp/PersonalStuff/blob/master/http-vuln-cve-2021-41773.nse
https://github.com/projectdiscovery/nuclei-templates/blob/master/vulnerabilities/apache/apache-httpd-rce.yaml
https://github.com/projectdiscovery/nuclei-templates/commit/9384dd235ec5107f423d930ac80055f2ce2bff74
https://attackerkb.com/topics/1RltOPCYqE/cve-2021-41773/rapid7-analysis

URL	Date	SRC
https://packetstorm.news/files/id/181114	2024-09-01
https://packetstorm.news/files/id/164941	2021-11-11
https://packetstorm.news/files/id/164609	2021-10-24
https://packetstorm.news/files/id/167397	2022-06-06
https://packetstorm.news/files/id/164629	2021-10-25
https://packetstorm.news/files/id/164501	2021-10-13
https://packetstorm.news/files/id/165089	2021-11-29
https://www.exploit-db.com/exploits/50406	2021-10-13
https://www.exploit-db.com/exploits/50446	2021-10-25
https://www.exploit-db.com/exploits/50512	2021-11-11
https://github.com/andrea-mattioli/apache-exploit-CVE-2021-42013	2021-10-08
https://github.com/asaotomo/CVE-2021-42013-Apache-RCE-Poc-Exp	2021-12-24
https://github.com/BassoNicolas/CVE-2021-42013	2024-04-07
https://github.com/TheLastVvV/CVE-2021-42013	2021-10-23
https://github.com/rafifdna/CVE-2021-42013	2024-06-27
https://github.com/rnsss/CVE-2021-42013	2022-01-07
https://github.com/LayarKacaSiber/CVE-2021-42013	2021-10-23
https://github.com/birdlinux/CVE-2021-42013	2023-06-26
https://github.com/mauricelambert/CVE-2021-42013	2022-03-14
https://github.com/robotsense1337/CVE-2021-42013	2021-11-03
https://github.com/12345qwert123456/CVE-2021-42013	2022-11-18
https://github.com/imhunterand/CVE-2021-42013	2024-01-07
https://github.com/Hamesawian/CVE-2021-42013	2023-06-29
https://github.com/vudala/CVE-2021-42013	2023-06-22
https://github.com/honypot/CVE-2021-42013	2022-02-19
https://github.com/jas9reet/CVE-2021-42013-LAB	2022-06-06
https://github.com/K3ysTr0K3R/CVE-2021-42013-EXPLOIT	2024-01-15
https://github.com/xMohamed0/CVE-2021-42013-ApacheRCE	2021-11-14
https://github.com/pisut4152/Sigma-Rule-for-CVE-2021-41773-and-CVE-2021-42013-exploitation-attempt	2021-10-08
https://github.com/Vulnmachines/cve-2021-42013	2024-10-12
https://github.com/twseptian/cve-2021-42013-docker-lab	2023-10-18
https://github.com/walnutsecurity/cve-2021-42013	2024-09-14
https://github.com/hadrian3689/apache_2.4.50	2023-01-04
https://github.com/viliuspovilaika/cve-2021-42013	2022-05-31
https://github.com/mightysai1997/cve-2021-42013	2024-11-13
https://github.com/cybfar/cve-2021-42013-httpd	2023-06-17
https://github.com/dream434/cve-2021-42013-apache	2024-10-09
https://github.com/bananoname/cve-2021-42013	2024-08-01
https://github.com/asepsaepdin/CVE-2021-42013	2025-01-30
https://github.com/Vanshuk-Bhagat/Apache-HTTP-Server-Vulnerabilities-CVE-2021-41773-and-CVE-2021-42013	2025-03-11
http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html	2025-02-04
http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html	2025-02-04
http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html	2025-02-04
http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html	2025-02-04
http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html	2025-02-04
https://www.povilaika.com/apache-2-4-50-exploit	2025-02-04

URL	Date	SRC
https://www.oracle.com/security-alerts/cpuapr2022.html	2023-11-07
https://www.oracle.com/security-alerts/cpujan2022.html	2023-11-07

URL	Date	SRC
https://httpd.apache.org/security/vulnerabilities_24.html	2021-05-10
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3	2023-11-07
https://security.gentoo.org/glsa/202208-20	2023-11-07
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.49 Search vendor "Apache" for product "Http Server" and version "2.4.49"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.50 Search vendor "Apache" for product "Http Server" and version "2.4.50"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		Affected
Oracle Search vendor "Oracle"		Instantis Enterprisetrack Search vendor "Oracle" for product "Instantis Enterprisetrack"				17.1 Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.1"		-		Affected
Oracle Search vendor "Oracle"		Instantis Enterprisetrack Search vendor "Oracle" for product "Instantis Enterprisetrack"				17.2 Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.2"		-		Affected
Oracle Search vendor "Oracle"		Instantis Enterprisetrack Search vendor "Oracle" for product "Instantis Enterprisetrack"				17.3 Search vendor "Oracle" for product "Instantis Enterprisetrack" and version "17.3"		-		Affected
Oracle Search vendor "Oracle"		Jd Edwards Enterpriseone Tools Search vendor "Oracle" for product "Jd Edwards Enterpriseone Tools"				< 9.2.6.0 Search vendor "Oracle" for product "Jd Edwards Enterpriseone Tools" and version " < 9.2.6.0"		-		Affected
Oracle Search vendor "Oracle"		Secure Backup Search vendor "Oracle" for product "Secure Backup"				< 18.1.0.1.0 Search vendor "Oracle" for product "Secure Backup" and version " < 18.1.0.1.0"		-		Affected
Netapp Search vendor "Netapp"		Cloud Backup Search vendor "Netapp" for product "Cloud Backup"				-		-		Affected