CVE-2021-40438

Apache HTTP Server-Side Request Forgery (SSRF)

Severity Score

9.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

Yes

*KEV

Decision

*SSVC

Descriptions

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.

Un uri-path diseñado puede causar que mod_proxy reenvíe la petición a un servidor de origen elegido por el usuario remoto. Este problema afecta a Apache HTTP Server versiones 2.4.48 y anteriores

A Server-Side Request Forgery (SSRF) flaw was found in mod_proxy of httpd. This flaw allows a remote, unauthenticated attacker to make the httpd server forward requests to an arbitrary server. The attacker could get, modify, or delete resources on other services that may be behind a firewall and inaccessible otherwise. The impact of this flaw varies based on what services and resources are available on the httpd network.

This vulnerability allows remote attackers to initiate arbitrary server-side requests on affected installations of Hewlett Packard Enterprise OneView. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the REST service, which listens on TCP port 443 by default. The issue results from the use of a vulnerable Apache HTTP server. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

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

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-09-02 CVE Reserved
2021-09-16 CVE Published
2021-10-18 First Exploit
2021-12-01 Exploited in Wild
2021-12-15 KEV Due Date
2024-08-04 CVE Updated
2024-09-19 EPSS Updated

CWE

CWE-918: Server-Side Request Forgery (SSRF)

CAPEC

References (29)

URL	Tag	Source
https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf	Third Party Advisory
https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a%40%3Cusers.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r2eb200ac1340f69aa22af61ab34780c531d110437910cb9c0ece3b37%40%3Cbugs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r3925e167d5eb1c75def3750c155d753064e1d34a143028bb32910432%40%3Cusers.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r61fdbfc26ab170f4e6492ef3bd5197c20b862ce156e9d5a54d4b899c%40%3Cusers.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r82838efc5fa6fc4c73986399c9b71573589f78b31846aff5bd9b1697%40%3Cusers.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r82c077663f9759c7df5a6656f925b3ee4f55fcd33c889ba7cd687029%40%3Cusers.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rf6954e60b1c8e480678ce3d02f61b8a788997785652e9557a3265c00%40%3Cusers.httpd.apache.org%3E	Mailing List
https://lists.debian.org/debian-lts-announce/2021/10/msg00001.html	Mailing List
https://security.netapp.com/advisory/ntap-20211008-0004	Third Party Advisory
https://www.tenable.com/security/tns-2021-17	Third Party Advisory

URL	Date	SRC
https://github.com/sixpacksecurity/CVE-2021-40438	2021-10-24
https://github.com/xiaojiangxl/CVE-2021-40438	2021-10-18
https://github.com/Kashkovsky/CVE-2021-40438	2022-04-03
https://github.com/sergiovks/CVE-2021-40438-Apache-2.4.48-SSRF-exploit	2023-12-12
https://github.com/BabyTeam1024/CVE-2021-40438	2021-10-28
https://github.com/gassara-kys/CVE-2021-40438	2022-06-10
https://github.com/Cappricio-Securities/CVE-2021-40438	2024-06-21
https://github.com/pisut4152/Sigma-Rule-for-CVE-2021-40438-exploitation-attempt	2021-11-30

URL	Date	SRC
https://www.oracle.com/security-alerts/cpuapr2022.html	2024-07-24
https://www.oracle.com/security-alerts/cpujan2022.html	2024-07-24

URL	Date	SRC
https://httpd.apache.org/security/vulnerabilities_24.html	2024-07-24
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPBR6WUYBJNACHKE65SPL7TJOHX7RHWD	2024-07-24
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNCYSR3BXT36FFF4XTCPL3HDQK4VP45R	2024-07-24
https://security.gentoo.org/glsa/202208-20	2024-07-24
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ	2024-07-24
https://www.debian.org/security/2021/dsa-4982	2024-07-24
https://access.redhat.com/security/cve/CVE-2021-40438	2021-10-14
https://bugzilla.redhat.com/show_bug.cgi?id=2005117	2021-10-14

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"				<= 2.4.48 Search vendor "Apache" for product "Http Server" and version " <= 2.4.48"		-		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
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected
Netapp Search vendor "Netapp"		Cloud Backup Search vendor "Netapp" for product "Cloud Backup"				-		-		Affected
Netapp Search vendor "Netapp"		Clustered Data Ontap Search vendor "Netapp" for product "Clustered Data Ontap"				-		-		Affected
Netapp Search vendor "Netapp"		Storagegrid Search vendor "Netapp" for product "Storagegrid"				-		-		Affected
Broadcom Search vendor "Broadcom"		Brocade Fabric Operating System Firmware Search vendor "Broadcom" for product "Brocade Fabric Operating System Firmware"				-		-		Affected
F5 Search vendor "F5"		F5os Search vendor "F5" for product "F5os"				>= 1.1.0 <= 1.1.4 Search vendor "F5" for product "F5os" and version " >= 1.1.0 <= 1.1.4"		-		Affected
F5 Search vendor "F5"		F5os Search vendor "F5" for product "F5os"				>= 1.2.0 <= 1.2.1 Search vendor "F5" for product "F5os" and version " >= 1.2.0 <= 1.2.1"		-		Affected
Oracle Search vendor "Oracle"		Enterprise Manager Ops Center Search vendor "Oracle" for product "Enterprise Manager Ops Center"				12.4.0.0 Search vendor "Oracle" for product "Enterprise Manager Ops Center" and version "12.4.0.0"		-		Affected
Oracle Search vendor "Oracle"		Http Server Search vendor "Oracle" for product "Http Server"				12.2.1.3.0 Search vendor "Oracle" for product "Http Server" and version "12.2.1.3.0"		-		Affected
Oracle Search vendor "Oracle"		Http Server Search vendor "Oracle" for product "Http Server"				12.2.1.4.0 Search vendor "Oracle" for product "Http Server" and version "12.2.1.4.0"		-		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"		Secure Global Desktop Search vendor "Oracle" for product "Secure Global Desktop"				5.6 Search vendor "Oracle" for product "Secure Global Desktop" and version "5.6"		-		Affected
Oracle Search vendor "Oracle"		Zfs Storage Appliance Kit Search vendor "Oracle" for product "Zfs Storage Appliance Kit"				8.8 Search vendor "Oracle" for product "Zfs Storage Appliance Kit" and version "8.8"		-		Affected
Siemens Search vendor "Siemens"		Ruggedcom Nms Search vendor "Siemens" for product "Ruggedcom Nms"				*		-		Affected
Siemens Search vendor "Siemens"		Sinec Nms Search vendor "Siemens" for product "Sinec Nms"				< 1.0.3 Search vendor "Siemens" for product "Sinec Nms" and version " < 1.0.3"		-		Affected
Siemens Search vendor "Siemens"		Sinema Remote Connect Server Search vendor "Siemens" for product "Sinema Remote Connect Server"				< 3.1 Search vendor "Siemens" for product "Sinema Remote Connect Server" and version " < 3.1"		-		Affected
Siemens Search vendor "Siemens"		Sinema Remote Connect Server Search vendor "Siemens" for product "Sinema Remote Connect Server"				3.2 Search vendor "Siemens" for product "Sinema Remote Connect Server" and version "3.2"		-		Affected
Siemens Search vendor "Siemens"		Sinema Server Search vendor "Siemens" for product "Sinema Server"				14.0 Search vendor "Siemens" for product "Sinema Server" and version "14.0"		-		Affected
Tenable Search vendor "Tenable"		Tenable.sc Search vendor "Tenable" for product "Tenable.sc"				<= 5.19.1 Search vendor "Tenable" for product "Tenable.sc" and version " <= 5.19.1"		-		Affected