CVE-2023-1717 : Vulnerability Insights and Analysis

This CVE-2023-1717 details a vulnerability in Bitrix24 that allows remote attackers to execute arbitrary JavaScript code in the victim's browser, potentially leading to the execution of arbitrary PHP code on the server if the victim has administrator privileges. The vulnerability is due to prototype pollution in a specific script file in Bitrix24 version 22.0.300.

Understanding CVE-2023-1717

This section provides insights into the nature and impact of CVE-2023-1717.

What is CVE-2023-1717?

CVE-2023-1717 involves prototype pollution in a script file of Bitrix24 version 22.0.300. This vulnerability enables remote attackers to inject and execute arbitrary JavaScript code in the victim's browser. If the victim holds administrator privileges, the attacker may further execute PHP code on the server.

The Impact of CVE-2023-1717

The impact of this vulnerability, categorized under CAPEC-588 as DOM-Based XSS, is critical. It poses a high risk to confidentiality, integrity, and availability, with a CVSS base score of 9.6 (Critical). The attack complexity is low, requiring no privileges from the user but user interaction is required.

Technical Details of CVE-2023-1717

Delving into the specifics of the vulnerability to understand its implications better.

Vulnerability Description

The vulnerability arises from prototype pollution in the script file

bitrix/templates/bitrix24/components/bitrix/menu/left_vertical/script.js

in Bitrix24 version 22.0.300. Attackers exploit this to execute JavaScript code on the victim's browser and potentially execute PHP code on the server, especially if the victim has administrative rights.

Affected Systems and Versions

Bitrix24 version 22.0.300 is identified as the affected version by this vulnerability. Users operating on this version are at risk of exploitation by malicious actors leveraging the scenario highlighted in the description.

Exploitation Mechanism

By polluting

__proto__[tag]

and

__proto__[text]

, remote attackers can manipulate the prototype of specific objects to inject and execute malicious JavaScript code, thereby compromising the victim's browser security.

Mitigation and Prevention

Understanding how to mitigate and prevent the exploit of CVE-2023-1717 is crucial for ensuring system security.

Immediate Steps to Take

Users of Bitrix24 version 22.0.300 should apply immediate security measures, such as restricting access levels, monitoring and filtering user input, and implementing security patches or updates provided by Bitrix24.

Long-Term Security Practices

To enhance system resilience against similar vulnerabilities, organizations should emphasize secure coding practices, conduct regular security audits, and educate users on safe browsing habits and permissions management.

Patching and Updates

It is imperative for Bitrix24 users to stay informed about security updates and patches released by the vendor. Promptly applying these updates can help close existing vulnerabilities and strengthen the overall security posture of the system.