CVE-2017-10795 in Subrion CMS
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Subrion CMS 4.1.4 allows remote attackers to inject arbitrary web script or HTML via the body to blog/add/, a different vulnerability than CVE-2017-6069.
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Analysis
by VulDB Data Team • 12/09/2022
The vulnerability identified as CVE-2017-10795 represents a cross-site scripting flaw within Subrion CMS version 4.1.4 that exposes the blogging functionality to malicious injection attacks. This issue specifically affects the blog/add/ endpoint where user input is not properly sanitized before being rendered back to users. The vulnerability allows remote attackers to execute arbitrary web scripts or HTML code within the context of other users' browsers, creating a significant security risk for websites utilizing this content management system.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding mechanisms within the Subrion CMS blogging module. When users submit content through the blog/add/ interface, the system fails to adequately filter or escape special characters that could be interpreted as executable code by web browsers. This weakness enables attackers to craft malicious payloads that, when executed, can perform unauthorized actions on behalf of authenticated users. The flaw operates as a classic reflected XSS vulnerability where malicious scripts are injected into the application's response and subsequently executed in the victim's browser context.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling attackers to steal session cookies, perform unauthorized actions, redirect users to malicious sites, or even deface the website content. Given that this affects a core blogging functionality within the CMS, the attack surface is significant as it could compromise multiple user accounts and potentially allow for privilege escalation. The vulnerability's classification aligns with CWE-79 which specifically addresses cross-site scripting flaws, and it demonstrates the importance of proper input sanitization in web applications. Attackers could leverage this vulnerability to hijack user sessions, gain persistent access to the CMS administrative interface, or use it as a foothold for further attacks within the compromised environment.
Mitigation strategies for CVE-2017-10795 should prioritize immediate patching of the Subrion CMS to version 4.2.0 or later where this vulnerability has been addressed. Organizations should implement proper input validation at multiple layers including client-side and server-side filtering, ensure comprehensive output encoding for all dynamic content, and deploy web application firewalls to detect and block malicious payloads. Additionally, security monitoring should be enhanced to detect unusual patterns in blog submission activities, and regular security audits should be conducted to identify similar vulnerabilities in other application components. The ATT&CK framework categorizes this vulnerability under T1203 - Exploitation for Client Execution, highlighting the need for defensive measures that protect against client-side exploitation techniques. Organizations should also consider implementing Content Security Policy headers to limit the execution of unauthorized scripts and establish secure coding practices that prevent similar vulnerabilities from emerging in future development cycles.