CVE-2020-21122 in UReport
Summary
by MITRE • 09/16/2021
UReport v2.2.9 contains a Server-Side Request Forgery (SSRF) in the designer page which allows attackers to detect intranet device ports.
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Analysis
by VulDB Data Team • 09/19/2021
The vulnerability identified as CVE-2020-21122 affects UReport version 2.2.9 and represents a critical server-side request forgery flaw that exposes internal network infrastructure to external attackers. This vulnerability specifically resides within the designer page component of the application, creating a pathway for malicious actors to leverage the system's functionality to probe and enumerate internal network services. The flaw enables unauthorized access to internal systems that would typically be protected behind firewalls and network segmentation controls, fundamentally compromising the security boundaries of affected organizations.
The technical implementation of this SSRF vulnerability stems from inadequate input validation and sanitization within the designer page functionality. Attackers can craft malicious requests that manipulate the application's internal processing to make HTTP requests to arbitrary internal endpoints. This occurs because the system fails to properly validate or restrict the URLs that can be accessed through the designer interface, allowing attackers to bypass normal network access controls and directly query internal services. The vulnerability operates at the application layer where the system processes user-supplied data without sufficient authorization checks or network boundary enforcement, creating a direct attack vector that aligns with CWE-918 standards for server-side request forgery.
The operational impact of this vulnerability extends beyond simple port scanning capabilities, as it provides attackers with comprehensive visibility into internal network topology and service availability. An attacker can leverage this vulnerability to identify running services, determine service versions, and potentially discover additional attack surfaces within the internal network. The exposure of internal device ports creates opportunities for further exploitation including service enumeration, version fingerprinting, and identification of vulnerable internal systems that may not be directly exposed to the internet. This reconnaissance capability significantly increases the attack surface and provides adversaries with valuable intelligence for subsequent exploitation phases, making it a critical concern for enterprise security posture.
Organizations affected by this vulnerability should implement immediate mitigations including input validation controls, network segmentation, and access controls to prevent unauthorized access to internal services. The recommended remediation involves implementing strict URL validation mechanisms that reject suspicious or internal network addresses, deploying web application firewalls to filter malicious requests, and restricting access to the designer page to trusted administrative users only. Additionally, organizations should conduct comprehensive network audits to identify any other potential SSRF vulnerabilities within their applications and implement proper network isolation controls to limit the impact of such vulnerabilities. This vulnerability demonstrates the importance of secure coding practices and proper input validation as outlined in the ATT&CK framework's application layer exploitation techniques, where adversaries leverage application weaknesses to gain unauthorized access to internal resources.