CVE-2021-42013 (GCVE-0-2021-42013)

Vulnerability from cvelistv5 – Published: 2021-10-07 15:50 – Updated: 2025-10-21 23:25
VLAI? CISA
Summary
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.
Severity ?
No CVSS data available.
CWE
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
https://httpd.apache.org/security/vulnerabilities… x_refsource_MISC
https://lists.apache.org/thread.html/r7c795cd45a3… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rb5b0e46f179… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/07/6 mailing-listx_refsource_MLIST
https://tools.cisco.com/security/center/content/C… vendor-advisoryx_refsource_CISCO
http://jvn.jp/en/jp/JVN51106450/index.html third-party-advisoryx_refsource_JVN
http://www.openwall.com/lists/oss-security/2021/10/08/1 mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r17a4c6ce9af… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/2 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/3 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/4 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/6 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/08/5 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/09/1 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/11/4 mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://www.openwall.com/lists/oss-security/2021/10/15/3 mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2021/10/16/1 mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021102… x_refsource_CONFIRM
http://packetstormsecurity.com/files/164629/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/164941/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/164501/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/164609/Apach… x_refsource_MISC
http://packetstormsecurity.com/files/165089/Apach… x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
http://packetstormsecurity.com/files/167397/Apach… x_refsource_MISC
https://www.povilaika.com/apache-2-4-50-exploit/ x_refsource_MISC
https://security.gentoo.org/glsa/202208-20 vendor-advisoryx_refsource_GENTOO
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: Apache HTTP Server 2.4.49
Affected: Apache HTTP Server 2.4.50
Create a notification for this product.
Credits
Reported by Juan Escobar from Dreamlab Technologies, Fernando Muñoz from NULL Life CTF Team, and Shungo Kumasaka
CISA Known Exploited Vulnerability
Data from the CISA Known Exploited Vulnerabilities Catalog

Date added: 2021-11-03

Due date: 2021-11-17

Required action: Apply updates per vendor instructions.

Used in ransomware: Known

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

Show details on NVD website
To clipboard 

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}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.