CVE-2018-11339 in ERPNext
Summary
by MITRE
An XSS issue was discovered in Frappe ERPNext v11.x.x-develop b1036e5 via a comment.
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Analysis
by VulDB Data Team • 10/21/2024
The vulnerability CVE-2018-11339 represents a cross-site scripting flaw identified in Frappe ERPNext version 11.x.x-develop at commit b1036e5. This issue specifically manifests through comment functionality within the web application, creating a potential vector for malicious actors to execute arbitrary JavaScript code in the context of a victim's browser session. The vulnerability stems from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it in the application's comment sections.
This XSS vulnerability operates under CWE-79 which categorizes cross-site scripting as a critical web application security weakness. The flaw allows attackers to inject malicious scripts that can persist in the application's comment system and subsequently execute against other users who view the affected content. The vulnerability's exploitation requires minimal privileges as it targets the comment submission functionality that typically accepts user input without adequate sanitization. Attackers can craft malicious payloads that leverage the vulnerability to steal session cookies, redirect users to phishing sites, or perform unauthorized actions on behalf of authenticated users.
The operational impact of this vulnerability extends beyond simple script execution, as it compromises the integrity of user data and session management within the ERPNext environment. When users interact with compromised comment sections, their browsers execute the injected JavaScript code, potentially leading to full account compromise or data exfiltration. The vulnerability affects the application's core functionality since comments represent a fundamental user interaction feature, making the attack surface particularly broad. The persistent nature of stored XSS attacks means that once the malicious comment is submitted, it remains active until manually removed by administrators, creating an ongoing threat vector.
Mitigation strategies for CVE-2018-11339 should prioritize input validation and output encoding as primary defense mechanisms. Organizations should implement strict sanitization of all user input, particularly in comment fields, using established libraries that properly encode special characters and remove or escape potentially dangerous script tags. The application should employ Content Security Policy headers to restrict script execution and prevent unauthorized code injection. Additionally, implementing proper access controls and regular security scanning of user-generated content can help detect and prevent exploitation attempts. Organizations using ERPNext should upgrade to patched versions that address this vulnerability and conduct thorough security assessments of their web applications to identify similar XSS vulnerabilities in other components. This vulnerability aligns with ATT&CK technique T1059.007 which covers scripting through web shells and similar attack vectors that leverage web application flaws for code execution.