SSRF and Arbitrary File Read in Givanz VvvebJs

Executive Summary

This vulnerability in givanz VvvebJs 1.7.2 allows attackers to perform Server-Side Request Forgery (SSRF) and arbitrary file reading due to improper handling of user-supplied URLs in the "file_get_contents" function within the "save.php" file.

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Impact Analysis

The vulnerability can allow attackers to make unauthorized requests from the server to internal or external systems (SSRF) and read arbitrary files on the server, potentially exposing sensitive information or enabling further attacks.

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Detection Guidance

You can detect this vulnerability by testing the vulnerable endpoint `save.php` with the `action=oembedProxy` parameter and supplying URLs that attempt to read sensitive files or access internal network resources. For example, using curl or Python requests to send requests like: `http://ip:port/save.php?action=oembedProxy&url=/etc/passwd` to check if the server returns the contents of sensitive files. Example command using curl: `curl "http://ip:port/save.php?action=oembedProxy&url=/etc/passwd"`. If the response contains file contents, the vulnerability exists. [1]

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Mitigation Strategies

Immediate mitigation steps include restricting or disabling access to the vulnerable `save.php` endpoint, especially the `oembedProxy` action parameter. Implement input validation and sanitization to prevent arbitrary URLs from being processed. Additionally, restrict outgoing HTTP requests from the server to internal resources and sensitive files. Applying patches or upgrading to a fixed version of VvvebJs beyond 1.7.4 when available is also recommended. [1]

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Compliance Impact

The provided resources do not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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