CVE-2019-7327 in ZoneMinder
Summary
by MITRE
Reflected Cross Site Scripting (XSS) exists in ZoneMinder through 1.32.3, allowing an attacker to execute HTML or JavaScript code via a vulnerable 'scale' parameter value in the view frame (frame.php) because proper filtration is omitted.
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Analysis
by VulDB Data Team • 07/04/2023
The vulnerability identified as CVE-2019-7327 represents a critical reflected cross site scripting flaw within ZoneMinder version 1.32.3 and earlier, exposing the system to potential exploitation by malicious actors seeking to execute arbitrary code within user browsers. This vulnerability specifically affects the frame.php component of the application where the scale parameter is processed without adequate input validation or sanitization measures, creating a pathway for attackers to inject malicious scripts into the application's response. The flaw enables an attacker to craft malicious URLs containing script payloads that, when executed by a victim's browser, can trigger unauthorized actions including but not limited to session hijacking, data theft, or redirection to malicious sites.
The technical implementation of this vulnerability stems from the absence of proper input filtering mechanisms within the ZoneMinder application's frame.php script. When a user requests a frame view with a malicious scale parameter, the application fails to sanitize the input before incorporating it into the HTML response sent to the browser. This omission creates a reflected XSS vector where the malicious payload is reflected back to the user through the application's response, bypassing standard security measures. The vulnerability is classified under CWE-79 as a failure to sanitize user input, specifically manifesting as a reflected cross site scripting vulnerability that allows arbitrary script execution in the victim's browser context.
The operational impact of this vulnerability extends beyond simple script execution, as it can be leveraged to perform sophisticated attacks within the context of the affected ZoneMinder system. An attacker could potentially exploit this vulnerability to steal user session cookies, execute malicious commands on behalf of authenticated users, or manipulate the application's interface to deceive users into performing unintended actions. The reflected nature of this XSS vulnerability means that the attack requires user interaction with a malicious link, making it particularly dangerous in environments where users might be tricked into clicking on compromised URLs within email communications or web forums. This vulnerability directly maps to attack techniques described in the MITRE ATT&CK framework under the T1059.007 sub-technique for Scripting, specifically targeting the execution of malicious scripts within web browser contexts.
Mitigation strategies for CVE-2019-7327 should prioritize immediate patching of the ZoneMinder application to version 1.32.4 or later, which contains the necessary fixes to address the input validation deficiencies. Organizations should implement comprehensive input validation and output encoding measures to prevent similar vulnerabilities from occurring in other components of their systems. Additional protective measures include deploying web application firewalls that can detect and block malicious payloads targeting XSS vulnerabilities, implementing content security policies to restrict script execution, and conducting regular security assessments to identify and remediate similar input validation flaws across all application components. The vulnerability demonstrates the critical importance of proper input sanitization and output encoding practices as outlined in OWASP Top Ten security guidelines, particularly in applications handling user-provided data within web interfaces.