CVE-2025-6837
BaseFortify
Publication date: 2025-06-29
Last updated on: 2026-04-29
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| code-projects | library_system | 1.0 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-434 | The product allows the upload or transfer of dangerous file types that are automatically processed within its environment. |
| CWE-284 | The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-6837 is a critical file upload vulnerability in the Library System version 1.0, specifically in the /profile.php file. The vulnerability arises because the system does not properly validate uploaded files, allowing attackers to manipulate the 'image' parameter to upload malicious PHP scripts such as AntSword webshells. These scripts can be executed on the server, granting attackers remote control over the system, including executing system commands, browsing the file system, and stealing sensitive data. The vulnerability can be exploited remotely without authentication and bypasses file type and content validation mechanisms. [1, 2, 3]
How can this vulnerability impact me? :
This vulnerability can lead to full system compromise. Attackers can upload and execute malicious PHP scripts, allowing them to run arbitrary system commands, browse and modify files, steal sensitive information such as database configuration and user data, escalate privileges, move laterally within the network, and maintain persistence by uploading additional backdoors. The system's confidentiality, integrity, and availability are all at risk due to this flaw. [1, 2, 3]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by monitoring for suspicious file uploads to the /profile.php endpoint, especially uploads of PHP files such as webshells. Detection can include searching for POST requests containing file uploads with PHP extensions or payloads containing patterns like 'eval(base64_decode' or POST parameters starting with 'a=ZXZ' (AntSword's Base64 prefix). Commands to detect such activity could include web server log analysis commands like: 1) grep for PHP uploads: `grep -i 'POST /profile.php' /var/log/apache2/access.log | grep -E '\.php'` 2) grep for suspicious POST payloads: `grep -i 'eval(base64_decode' /var/log/apache2/access.log` or `grep -i 'a=ZXZ' /var/log/apache2/access.log`. Additionally, deploying Endpoint Detection and Response (EDR) tools to monitor execution of PHP files in web directories can help detect exploitation attempts. [3, 2]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include blocking uploads of PHP scripts at the web server level using directives such as Apache's `<FilesMatch "\.(php|php3|php5|phtml)$"> Require all denied </FilesMatch>`. Implement Web Application Firewall (WAF) rules to detect and block AntSword-specific payloads, for example, those containing 'eval(base64_decode' or POST parameters starting with 'a=ZXZ'. Additionally, monitor and log suspicious requests containing dangerous functions like 'eval' and 'base64_decode'. These steps help prevent the upload and execution of malicious scripts until a more permanent fix, such as strict file validation and secure storage, can be implemented. [3]