CVE-2025-45872 in ZrLog
Summary
by MITRE • 07/01/2025
zrlog v3.1.5 was discovered to contain a Server-Side Request Forgery (SSRF) via the downloadUrl parameter.
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Analysis
by VulDB Data Team • 07/03/2025
The vulnerability identified as CVE-2025-45872 affects zrlog version 3.1.5 and represents a critical server-side request forgery flaw that enables remote attackers to manipulate the application's behavior by forcing it to make unintended requests to internal or external systems. This issue manifests through the downloadUrl parameter, which lacks proper input validation and sanitization mechanisms. The vulnerability resides in the application's handling of URL parameters that are intended to facilitate content downloads, creating an attack vector where malicious actors can exploit the system's trust in its own internal processes.
The technical implementation of this SSRF vulnerability stems from insufficient validation of user-supplied input within the downloadUrl parameter processing logic. When the application receives a request containing this parameter, it fails to properly verify the legitimacy of the provided URL or restrict access to internal network resources. This allows attackers to craft malicious requests that can traverse internal network boundaries, potentially accessing sensitive systems, services, or data that should remain isolated from external access. The flaw operates under CWE-918, which specifically addresses server-side request forgery vulnerabilities where applications fail to validate or sanitize external input that influences HTTP requests.
The operational impact of this vulnerability extends beyond simple data exfiltration, as it can enable attackers to perform reconnaissance activities within the internal network, potentially leading to further exploitation opportunities. An attacker could leverage this vulnerability to access internal services such as databases, administrative interfaces, or other networked systems that are not directly exposed to the internet. The attack surface is particularly concerning given that zrlog is a content management system that may have access to sensitive user data, configuration files, or system resources. This vulnerability aligns with ATT&CK technique T1566.002, which covers server-side request forgery as a method for initial access and lateral movement within compromised environments.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and sanitization for all URL parameters, particularly those used in download or external resource retrieval functions. Organizations should deploy strict URL validation mechanisms that reject requests attempting to access internal IP ranges or localhost addresses, while also implementing network-level restrictions to prevent the application from accessing unauthorized resources. The implementation of a whitelist-based approach for acceptable download sources, combined with proper network segmentation and firewall rules, can significantly reduce the risk of exploitation. Additionally, regular security testing and code reviews should be conducted to identify similar vulnerabilities in other parameters or functions that may present analogous risks. The fix should include proper URL parsing and validation that ensures all external requests originate from legitimate, expected sources while maintaining the application's intended functionality for legitimate users.