CVE-2023-46736 Explained : Impact and Mitigation

Server-Side Request Forgery in espocrm

Understanding CVE-2023-46736

EspoCRM, an Open Source CRM software, is affected by a Server-Side Request Forgery (SSRF) vulnerability that allows users to upload images from a URL. This vulnerability, identified as CWE-918, can lead to the disclosure of internal information, targeting internal hosts, and bypassing firewalls.

What is CVE-2023-46736?

In EspoCRM versions prior to 8.0.5, the

/Attachment/fromImageUrl

endpoint allows SSRF attacks, enabling users to reference internal hosts, potentially compromising security. The vulnerability was discovered in commit

c536cee6375e2088f961af13db7aaa652c983072

.

The Impact of CVE-2023-46736

The SSRF vulnerability in EspoCRM poses a medium severity threat with a CVSSv3 base score of 5.3. Attackers with low privileges can exploit this vulnerability to gain access to sensitive information and circumvent security controls.

Technical Details of CVE-2023-46736

Vulnerability Description

The vulnerability allows attackers to manipulate the server to send requests to internal systems, bypassing security measures and potentially leading to unauthorized access and data leakage.

Affected Systems and Versions

EspoCRM versions prior to 8.0.5 are affected by this SSRF vulnerability.

Exploitation Mechanism

Malicious actors can exploit the

/Attachment/fromImageUrl

endpoint to make SSRF requests, tricking the server into fetching data from internal or unauthorized sources.

Mitigation and Prevention

Immediate Steps to Take

Users are strongly encouraged to update to version 8.0.5 or later to mitigate the SSRF vulnerability. Implementing strict input validation and monitoring network traffic can help detect and prevent SSRF attacks.

Long-Term Security Practices

Regularly updating the CRM software and conducting security audits can help identify and address vulnerabilities before they are exploited by attackers.

Patching and Updates

The vulnerability has been patched in commit

c536cee6375e2088f961af13db7aaa652c983072

, included in EspoCRM version 8.0.5. Stay informed about security advisories and promptly apply patches to ensure ongoing protection.