CVE-2022-36760
Description
A flaw was found in the mod_proxy_ajp module of httpd. The connection is not closed when there is an invalid Transfer-Encoding header, allowing an attacker to smuggle requests to the AJP server, where it forwards requests.
Statement
This flaw only affects configurations with mod_proxy_ajp loaded and with an AJP backend configured. If there is no proxy configured to an AJP backend the server is not affected and no further mitigation is needed. For more information about the mitigation, check the mitigation section below.
The httpd mod_proxy_ajp module is enabled by default on Red Hat Enterprise Linux 6, 7, 8, 9, and in RHSCL. However, there are no directives forwarding requests using the AJP protocol.
This flaw has been rated as having a security impact of moderate, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 7. Red Hat Enterprise Linux 7 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | 9 | 9 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | High | High | High |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Changed | Changed | Changed |
| Confidentiality | Low | High | High |
| Integrity Impact | Low | High | High |
| Availability Impact | Low | High | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Red Hat CVSS v3 Score Explanation
Red Hat Product Security strongly recommends that AJP, as an insecure mechanism, should never be exposed to untrusted clients or run on an open, unsecured network. Also, HTTP request smuggling vulnerabilities are context dependent and their impact can greatly vary based on the specific infrastructure, application and configurations. Therefore, Red Hat has scored differently from NVD, specifically the impact in confidentiality, integrity and availability metrics.
Understanding the Weakness (CWE)
Integrity,Non-Repudiation,Access Control
Technical Impact: Unexpected State; Hide Activities; Bypass Protection Mechanism
An attacker could create HTTP messages to exploit a number of weaknesses including 1) the message can trick the web server to associate a URL with another URL's webpage and caching the contents of the webpage (web cache poisoning attack), 2) the message can be structured to bypass the firewall protection mechanisms and gain unauthorized access to a web application, and 3) the message can invoke a script or a page that returns client credentials (similar to a Cross Site Scripting attack).
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