CVE-2019-16643 in ZrLog
Summary
by MITRE
An issue was discovered in ZrLog 2.1.1. There is a Stored XSS vulnerability in the article_edit area.
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Analysis
by VulDB Data Team • 12/27/2023
The vulnerability identified as CVE-2019-16643 represents a critical security flaw in ZrLog version 2.1.1 that exposes the application to persistent cross-site scripting attacks. This issue specifically manifests within the article_edit functionality of the blogging platform, creating a persistent security risk that can affect all users interacting with the affected system. The vulnerability stems from inadequate input validation and output sanitization mechanisms that fail to properly handle malicious script content submitted through the article editing interface.
This stored cross-site scripting vulnerability operates through a classic attack vector where malicious actors can inject persistent script code into the application's database through the article editing area. When other users view the affected articles, the malicious scripts execute in their browsers within the context of the vulnerable application, potentially allowing attackers to steal session cookies, perform unauthorized actions, or redirect users to malicious sites. The stored nature of this vulnerability means that the malicious payload persists in the database and affects all users who access the compromised content, unlike reflected XSS which requires user interaction with a specific malicious link.
From a technical perspective, the vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications. The flaw demonstrates poor input validation practices where user-supplied content from the article_edit form is not properly sanitized before being stored and subsequently rendered back to users. This creates an environment where attacker-controlled scripts can be executed in the context of authenticated users, potentially leading to privilege escalation or complete account compromise. The vulnerability can be exploited by attackers who gain access to the article editing interface or through other means that allow them to submit malicious content to the system.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains that leverage the application's legitimate functionality. Attackers can use the stored XSS to harvest authentication tokens, manipulate user sessions, or even redirect victims to phishing sites that appear legitimate within the context of the vulnerable application. This vulnerability particularly affects content management systems where users can submit rich text content, and it underscores the critical importance of implementing comprehensive input sanitization and output encoding mechanisms. The attack surface is significantly expanded when considering that compromised content can be viewed by multiple users, potentially affecting thousands of system interactions.
Mitigation strategies for CVE-2019-16643 must address both the immediate vulnerability and broader security posture of the application. Organizations should implement strict input validation and output encoding for all user-supplied content, particularly within rich text editing interfaces. The recommended approach includes implementing Content Security Policy headers, employing proper HTML escaping mechanisms, and utilizing secure coding practices that prevent malicious scripts from being stored or executed. Additionally, regular security audits should be conducted to identify similar vulnerabilities in other application components, with particular attention to areas where user-generated content is processed. The vulnerability also highlights the importance of maintaining up-to-date software versions and implementing proper access controls to limit who can submit content to the system. This remediation approach aligns with ATT&CK technique T1059.001 which covers command and scripting interpreter, as the vulnerability enables attackers to execute malicious scripts through the application's legitimate interfaces.