2021-39241 | HAProxy HTTP Method admin access control

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.54

A vulnerability was found in HAProxy up to 12.0.23/2.2.15/2.3.12/2.4.2 (Firewall Software). It has been rated as critical. This issue affects an unknown code block of the file /admin of the component HTTP Method Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-284. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in HAProxy 2.0 before 2.0.24, 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. An HTTP method name may contain a space followed by the name of a protected resource. It is possible that a server would interpret this as a request for that protected resource, such as in the “GET /admin? HTTP/1.1 /static/images HTTP/1.1” example.

The weakness was published 08/18/2021. The advisory is shared at mail-archive.com. The identification of this vulnerability is CVE-2021-39241 since 08/17/2021. The exploitation is known to be easy. The attack may be initiated remotely. The requirement for exploitation is a simple authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 2.0.24, 2.2.16, 2.3.13 or 2.4.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.haproxy.org. The best possible mitigation is suggested to be upgrading to the latest version.

Type

Name

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Privilege escalation
CWE: CWE-284
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HAProxy 2.0.24/2.2.16/2.3.13/2.4.3
Patch: git.haproxy.org

08/17/2021 CVE assigned
08/18/2021 +1 days Advisory disclosed
08/18/2021 +0 days VulDB entry created
08/19/2021 +1 days VulDB last updateAdvisory: mail-archive.com
Status: Confirmed

CVE: CVE-2021-39241 (🔒)

Created: 08/18/2021 09:11
Updated: 08/19/2021 18:18
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

Comments

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