Home > Vulnerability Database > CVE-2021-42013

Mend.io Vulnerability Database

CVE-2021-42013

Date: October 7, 2021

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.

Language: C

Severity Score

9.8

Related Resources (40)

Url: https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb@%3Cusers.httpd.apache.org%3E

Url: http://www.openwall.com/lists/oss-security/2021/10/11/4

Url: http://packetstormsecurity.com/files/164501/Apache-HTTP-Server-2.4.50-Path-Traversal-Code-Execution.html

Url: http://www.openwall.com/lists/oss-security/2021/10/15/3

Url: https://httpd.apache.org/security/vulnerabilities_24.html

Url: http://www.openwall.com/lists/oss-security/2021/10/16/1

Url: http://packetstormsecurity.com/files/164629/Apache-2.4.49-2.4.50-Traversal-Remote-Code-Execution.html

Url: http://jvn.jp/en/jp/JVN51106450/index.html

Url: https://www.povilaika.com/apache-2-4-50-exploit/

Url: https://security.netapp.com/advisory/ntap-20211029-0009/

Url: https://www.oracle.com/security-alerts/cpujan2022.html

Url: https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837@%3Cannounce.apache.org%3E

Url: http://www.openwall.com/lists/oss-security/2021/10/08/2

Url: http://www.openwall.com/lists/oss-security/2021/10/09/1

Url: http://www.openwall.com/lists/oss-security/2021/10/08/1

Url: http://packetstormsecurity.com/files/165089/Apache-HTTP-Server-2.4.50-CVE-2021-42013-Exploitation.html

Url: https://security.alpinelinux.org/vuln/CVE-2021-42013

Url: http://www.openwall.com/lists/oss-security/2021/10/08/4

Url: https://www.oracle.com/security-alerts/cpuapr2022.html

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/

Url: http://www.openwall.com/lists/oss-security/2021/10/08/3

Url: https://security-tracker.debian.org/tracker/CVE-2021-42013

Url: http://www.openwall.com/lists/oss-security/2021/10/08/6

Url: http://www.openwall.com/lists/oss-security/2021/10/07/6

Url: http://www.openwall.com/lists/oss-security/2021/10/08/5

Url: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/

Url: http://packetstormsecurity.com/files/164609/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-42013

Url: https://lists.apache.org/thread.html/r7c795cd45a3384d4d27e57618a215b0ed19cb6ca8eb070061ad5d837%40%3Cannounce.apache.org%3E

Url: https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3@%3Ccvs.httpd.apache.org%3E

Url: http://packetstormsecurity.com/files/167397/Apache-2.4.50-Remote-Code-Execution.html

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WS5RVHOIIRECG65ZBTZY7IEJVWQSQPG3/

Url: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-pathtrv-LAzg68cZ

Url: https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RMIIEFINL6FUIOPD2A3M5XC6DH45Y3CC/

Url: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-42013

Url: https://security.gentoo.org/glsa/202208-20

Url: https://lists.apache.org/thread.html/r17a4c6ce9aff662efd9459e9d1850ab4a611cb23392fc68264c72cb3%40%3Ccvs.httpd.apache.org%3E

Url: https://lists.apache.org/thread.html/rb5b0e46f179f60b0c70204656bc52fcb558e961cb4d06a971e9e3efb%40%3Cusers.httpd.apache.org%3E

Url: http://packetstormsecurity.com/files/164941/Apache-HTTP-Server-2.4.50-Remote-Code-Execution.html

Url: https://www.mend.io/vulnerability-database/CVE-2021-42013

Severity Score

9.8

Weakness Type (CWE)

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-22

CVSS v3.1

Base Score:	9.8
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	NONE
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	HIGH
Integrity (I):	HIGH
Availability (A):	HIGH

CVSS v2

Base Score:	7.5
Access Vector (AV):	NETWORK
Access Complexity (AC):	LOW
Authentication (AU):	NONE
Confidentiality (C):	PARTIAL
Integrity (I):	PARTIAL
Availability (A):	PARTIAL
Additional information:

Mend.io Vulnerability Database

We found results for “”

CVE-2021-42013

Date: October 7, 2021

Language: C

Severity Score

Related Resources (40)

Severity Score

Weakness Type (CWE)

CVSS v3.1

CVSS v2

Do you need more information?