2021-38751 | ExponentCMS HTTP Host Header exponent_constants.php injection

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.
4.9	$0-$5k	0.32

A vulnerability classified as critical was found in ExponentCMS up to 2.6. This vulnerability affects some unknown processing of the file /exponent_constants.php of the component HTTP Host Header Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. The CWE definition for the vulnerability is CWE-74. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A HTTP Host header attack exists in ExponentCMS 2.6 and below in /exponent_constants.php. A modified HTTP header can change links on the webpage to an arbitrary value, leading to a possible attack vector for MITM.

The weakness was presented 08/16/2021. The advisory is shared for download at github.com. This vulnerability was named CVE-2021-38751 since 08/16/2021. The exploitation appears to be easy. Access to the local network is required for this attack to succeed. Required for exploitation is a single authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/18/2021).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Name

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.9
VulDB Temp Score: 4.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Class: Privilege escalation
CWE: CWE-74
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

08/16/2021 Advisory disclosed
08/16/2021 +0 days CVE assigned
08/16/2021 +0 days VulDB entry created
08/18/2021 +2 days VulDB last updateAdvisory: github.com
Status: Confirmed

CVE: CVE-2021-38751 (🔒)

Created: 08/16/2021 22:48
Updated: 08/18/2021 17:46
Changes: (2) source_cve_assigned source_cve_nvd_summary
Complete: 🔍

Comments

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