CVE-2021-40438

Published on: 09/16/2021 12:00:00 AM UTC

Last Modified on: 11/29/2021 05:20:00 PM UTC

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Certain versions of Http Server from Apache contain the following vulnerability:

A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.

  • CVE-2021-40438 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as CRITICAL severity.
  • Affected Vendor/Software: URL Logo Apache Software Foundation - Apache HTTP Server version <= 2.4.48

CVSS3 Score: 9 - CRITICAL

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK HIGH NONE NONE
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
CHANGED HIGH HIGH HIGH

CVSS2 Score: 6.8 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL PARTIAL PARTIAL

CVE References

Description Tags Link
September 2021 Apache HTTP Server Vulnerabilities in NetApp Products | NetApp Product Security security.netapp.com
text/html
URL Logo CONFIRM security.netapp.com/advisory/ntap-20211008-0004/
[R1] Stand-alone Security Patch Available for Tenable.sc versions 5.16.0 to 5.19.1: Patch 202110.1 - Security Advisory | Tenable® www.tenable.com
text/html
URL Logo CONFIRM www.tenable.com/security/tns-2021-17
[SECURITY] Fedora 35 Update: httpd-2.4.49-1.fc35 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-e3f6dd670d
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20210923 [[email protected]] Re: [External] : [[email protected]] 2.4.49 security fixes: more info
Debian -- Security Information -- DSA-4982-1 apache2 www.debian.org
Depreciated Link
text/html
URL Logo DEBIAN DSA-4982
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20211019 [[email protected]] Regarding CVE-2021-40438
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20210923 [[email protected]] 2.4.49 security fixes: more info
Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021 tools.cisco.com
text/html
URL Logo CISCO 20211124 Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20210923 Re: [[email protected]] Re: [External] : [[email protected]] 2.4.49 security fixes: more info
Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project httpd.apache.org
text/html
URL Logo MISC httpd.apache.org/security/vulnerabilities_24.html
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20210923 Re: [[email protected]] 2.4.49 security fixes: more info
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-bugs] 20211008 [Bug 65616] CVE-2021-36160 regression
[SECURITY] [DLA 2776-1] apache2 security update lists.debian.org
text/html
URL Logo MLIST [debian-lts-announce] 20211002 [SECURITY] [DLA 2776-1] apache2 security update
Pony Mail! lists.apache.org
text/html
URL Logo MLIST [httpd-users] 20211019 Re: [[email protected]] Regarding CVE-2021-40438
[SECURITY] Fedora 34 Update: httpd-2.4.49-1.fc34 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
text/html
URL Logo FEDORA FEDORA-2021-dce7e7738e

Related QID Numbers

  • 159418 Oracle Enterprise Linux Security Update for httpd:2.4 (ELSA-2021-3816)
  • 159419 Oracle Enterprise Linux Security Update for httpd (ELSA-2021-3856)
  • 178815 Debian Security Update for apache2 (DLA 2776-1)
  • 178819 Debian Security Update for apache2 (DSA 4982-1)
  • 198516 Ubuntu Security Notification for Apache Hypertext Transfer Protocol (HTTP) Server Vulnerabilities (USN-5090-1)
  • 239667 Red Hat Update for httpd24-httpd (RHSA-2021:3754)
  • 239668 Red Hat Update for Red Hat JBoss Core Services Apache Hypertext Transfer Protocol Server (HTTP Server) 2.4.37 SP9 (RHSA-2021:3746)
  • 239671 Red Hat Update for httpd:2.4 (RHSA-2021:3816)
  • 239681 Red Hat Update for httpd (RHSA-2021:3856)
  • 239686 Red Hat Update for httpd:2.4 (RHSA-2021:3837)
  • 239687 Red Hat Update for httpd:2.4 (RHSA-2021:3836)
  • 239871 Red Hat Update for httpd:2.4 (RHSA-2021:4537)
  • 257120 CentOS Security Update for httpd (CESA-2021:3856)
  • 281910 Fedora Security Update for Hypertext Transfer Protocol Daemon (HTTPd) (FEDORA-2021-dce7e7738e)
  • 352857 Amazon Linux Security Advisory for httpd24: ALAS-2021-1543
  • 352858 Amazon Linux Security Advisory for httpd: ALAS2-2021-1716
  • 375988 Apache Hypertext Transfer Protocol (HTTP) Server Multiple Vulnerabilities
  • 376041 IBM Hypertext Transfer Protocol (HTTP) Server Multiple Vulnerabilities (6493841)
  • 690025 Free Berkeley Software Distribution (FreeBSD) Security Update for apache httpd (882a38f9-17dd-11ec-b335-d4c9ef517024)
  • 730209 Apache Hypertext Transfer Protocol Server (HTTP Server) Multiple Vulnerabilities
  • 751198 SUSE Enterprise Linux Security Update for apache2 (SUSE-SU-2021:3299-1)
  • 751216 SUSE Enterprise Linux Security Update for apache2 (SUSE-SU-2021:3335-1)
  • 751279 OpenSUSE Security Update for apache2 (openSUSE-SU-2021:3522-1)
  • 751314 OpenSUSE Security Update for apache2 (openSUSE-SU-2021:1438-1)
  • 87468 Apache Hypertext Transfer Protocol (HTTP) Server mod_proxy Server-Side Request Forgery (SSRF) Vulnerability
  • 87470 IBM Hypertext Transfer Protocol (HTTP) Server Multiple Vulnerabilities (6493841)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationApacheHttp ServerAllAllAllAll
Operating
System
DebianDebian Linux10.0AllAllAll
Operating
System
DebianDebian Linux11.0AllAllAll
Operating
System
DebianDebian Linux9.0AllAllAll
Operating
System
F5F5osAllAllAllAll
Operating
System
F5F5osAllAllAllAll
Operating
System
FedoraprojectFedora34AllAllAll
Operating
System
FedoraprojectFedora35AllAllAll
ApplicationNetappClustered Data Ontap-AllAllAll
ApplicationNetappStoragegrid-AllAllAll
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*:
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*:
  • cpe:2.3:o:f5:f5os:*:*:*:*:*:*:*:*:
  • cpe:2.3:o:f5:f5os:*:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*:
  • cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*:
  • cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*:
  • cpe:2.3:a:netapp:storagegrid:-:*:*:*:*:*:*:*:

Discovery Credit

The issue was discovered by the Apache HTTP security team while analysing CVE-2021-36160

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-40438 : A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen… twitter.com/i/web/status/1… 2021-09-16 14:47:09
Twitter Icon @omokazuki SIOSセキュリティブログを更新しました。 Apacheの脆弱性情報(High: CVE-2021-40438, Moderate: CVE-2021-33193, CVE-2021-34798, CVE-2021-36160,… twitter.com/i/web/status/1… 2021-09-16 16:24:51
Twitter Icon @LinInfoSec Mod_proxy - CVE-2021-40438: httpd.apache.org/security/vulne… 2021-09-16 19:45:21
Twitter Icon @autumn_good_35 httpd 2.4系の脆弱性アップデート。 CVE-2021-33193 CVE-2021-34798 CVE-2021-36160 CVE-2021-39275 CVE-2021-40438 Apache HTTP Serv… twitter.com/i/web/status/1… 2021-09-17 05:58:19
Reddit Logo Icon /r/netsec Building a POC for CVE-2021-40438 – SSRF in apache2 mod_proxy 2021-10-15 13:22:47
Reddit Logo Icon /r/blueteamsec CVE-2021-40438 Apache SSRF as a one-liner 2021-10-15 18:17:33
Reddit Logo Icon /r/Cisco PSA: Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products 2021-11-24 22:20:39
Reddit Logo Icon /r/InfoSecNews Experts warn of attacks exploiting CVE-2021-40438 flaw in Apache HTTP Server 2021-11-29 20:45:45
Reddit Logo Icon /r/devopsish Experts warn of attacks exploiting CVE-2021-40438 flaw in Apache HTTP Server 2021-11-30 03:21:10
Reddit Logo Icon /r/KibernetinisSaugumas Apache ir mod_proxy pažeidžiamumas 2021-12-02 09:00:18
Reddit Logo Icon /r/nessus Nessus precise versioning scans 2021-12-06 16:06:16
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