CVE-2023-1718 : Security Advisory and Response

This CVE record pertains to a vulnerability identified in Bitrix24 that allows unauthenticated remote attackers to cause denial-of-service via improper file stream access. The vulnerability has a high impact severity level and affects version 22.0.300 of Bitrix24.

Understanding CVE-2023-1718

This section delves into the details of the CVE-2023-1718 vulnerability in Bitrix24.

What is CVE-2023-1718?

The CVE-2023-1718 vulnerability involves improper file stream access in Bitrix24 version 22.0.300, which enables unauthenticated remote attackers to execute denial-of-service attacks by exploiting a crafted "tmp_url."

The Impact of CVE-2023-1718

The impact of this vulnerability is classified as high, with an availability impact rating of HIGH and a base severity score of 7.5. The vulnerability could potentially allow attackers to pull data from system resources, posing a significant threat to the affected systems.

Technical Details of CVE-2023-1718

This section provides a deeper insight into the technical aspects of the CVE-2023-1718 vulnerability.

Vulnerability Description

The vulnerability arises due to improper file stream access in the "/desktop_app/file.ajax.php" endpoint of Bitrix24 version 22.0.300. Attackers can exploit this flaw to launch denial-of-service attacks remotely without the need for authentication.

Affected Systems and Versions

Bitrix24 version 22.0.300 is confirmed to be affected by this vulnerability, while other versions may not be impacted. Users of the affected version are at risk of exploitation if proper mitigation measures are not implemented promptly.

Exploitation Mechanism

Exploiting the vulnerability involves utilizing a crafted "tmp_url" to trigger improper file stream access, which in turn leads to denial-of-service conditions. The attack vector is network-based, and the complexity of the attack is low.

Mitigation and Prevention

To address CVE-2023-1718 and enhance the security posture of Bitrix24 installations, immediate steps and long-term security practices should be implemented.

Immediate Steps to Take

Users are advised to apply security patches or updates provided by Bitrix24 promptly. Additionally, restricting access to the vulnerable endpoint and implementing network-level protections can help mitigate the risk of exploitation.

Long-Term Security Practices

In the long term, organizations should prioritize ongoing monitoring, vulnerability assessments, and security awareness training to prevent similar security incidents. Employing secure coding practices and robust access controls can bolster the resilience of systems against potential threats.

Patching and Updates

Regularly monitoring for security updates and patches released by Bitrix24 is crucial to ensuring that known vulnerabilities are addressed promptly. Timely deployment of patches can close off avenues for exploitation and enhance the overall security posture of the system.