CVE-2023-39108 in rconfig
Summary
by MITRE • 08/01/2023
rconfig v3.9.4 was discovered to contain a Server-Side Request Forgery (SSRF) via the path_b parameter in the doDiff Function of /classes/compareClass.php. This vulnerability allows authenticated attackers to make arbitrary requests via injection of crafted URLs.
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Analysis
by VulDB Data Team • 08/24/2023
The vulnerability identified as CVE-2023-39108 affects rconfig version 3.9.4 and represents a critical server-side request forgery flaw that resides within the application's comparison functionality. This issue manifests through the path_b parameter within the doDiff function of the /classes/compareClass.php file, creating a pathway for malicious actors to manipulate the application's behavior by injecting crafted URLs. The vulnerability is particularly concerning because it requires only authentication to exploit, meaning that any user with valid credentials can potentially leverage this flaw against the system. The SSRF vulnerability allows attackers to make arbitrary requests from the server, potentially enabling them to access internal resources that would otherwise be protected by network segmentation or firewalls.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the comparison class functionality. When the doDiff function processes the path_b parameter, it fails to properly validate or sanitize user-supplied URLs, allowing attackers to inject malicious URLs that can be processed by the server's HTTP client. This flaw directly maps to CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to properly validate external resource requests. The vulnerability creates a dangerous attack surface where authenticated users can potentially access internal systems, bypass network security controls, and perform reconnaissance activities that would normally be restricted. The attack vector is particularly insidious because it leverages legitimate application functionality to execute unauthorized requests, making detection more challenging for security monitoring systems.
From an operational impact perspective, this vulnerability exposes organizations to significant security risks including internal network reconnaissance, data exfiltration, and potential lateral movement within the network infrastructure. Attackers could use the SSRF capability to probe internal services, access sensitive configuration files, or even attempt to exploit other vulnerabilities within the internal network. The authenticated nature of the exploit means that attackers don't need to perform additional credential harvesting, making the attack surface more accessible. This vulnerability aligns with ATT&CK technique T1071.004, which covers application layer protocol traffic inspection, and could potentially support techniques for privilege escalation or lateral movement. Organizations using rconfig 3.9.4 are at risk of having their internal systems compromised, particularly if the application server has access to sensitive internal resources or if the server is configured with minimal network segmentation.
Mitigation strategies for CVE-2023-39108 should focus on immediate patching of the rconfig application to the latest version that addresses this vulnerability. Organizations should implement strict input validation and sanitization measures for all parameters processed by the comparison functionality, particularly those that handle URL inputs. Network segmentation and firewall rules should be reviewed to limit the server's ability to access internal resources unnecessarily. The implementation of web application firewalls and security monitoring solutions that can detect unusual outbound requests from the application server should be considered as additional defensive measures. Access controls should be reviewed to ensure that only authorized users have access to the comparison functionality, and regular security audits should be conducted to identify similar vulnerabilities within the application codebase. Additionally, organizations should implement proper logging and monitoring of all file comparison operations to detect potential exploitation attempts and maintain audit trails for security investigations.