CVE-2020-5669 in Movable Type Premium
Summary
by MITRE • 10/26/2021
Cross-site scripting vulnerability in Movable Type Movable Type Premium 1.37 and earlier and Movable Type Premium Advanced 1.37 and earlier allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.
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Analysis
by VulDB Data Team • 10/30/2021
This cross-site scripting vulnerability exists within Movable Type Premium versions 1.37 and earlier, as well as Movable Type Premium Advanced versions 1.37 and earlier. The flaw represents a critical security weakness that enables remote authenticated attackers to execute malicious scripts within the context of affected applications. The vulnerability stems from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before rendering it in web pages. This allows attackers who have already gained authentication credentials to inject malicious JavaScript code through unspecified vectors within the application's interface. The vulnerability is categorized under CWE-79 as a failure to sanitize user input, which directly enables XSS attacks that can compromise user sessions and data integrity. Attackers can leverage this weakness to perform session hijacking, steal sensitive information, or redirect users to malicious websites. The impact extends beyond simple script injection as it can lead to complete compromise of user accounts and potential lateral movement within affected systems.
The operational implications of this vulnerability are severe for organizations using affected Movable Type versions, as it requires only authenticated access to exploit. This means that any user with valid credentials, whether legitimate administrators or compromised accounts, can potentially leverage this flaw to execute arbitrary code. The attack surface includes various application components where user input is processed, such as content management interfaces, comment systems, and administrative panels. The vulnerability's classification under ATT&CK technique T1059.007 indicates that it enables command and control activities through script injection, while T1548.002 suggests potential privilege escalation opportunities. Organizations may experience unauthorized access to sensitive content, data exfiltration, and potential system compromise through session manipulation. The vulnerability essentially undermines the security model of the application by allowing authenticated users to bypass normal access controls and execute malicious payloads.
Mitigation strategies for this vulnerability require immediate patching of affected systems to Movable Type versions that address the XSS weakness. Organizations should implement comprehensive input validation and output encoding mechanisms across all user-facing interfaces to prevent script injection attempts. Security teams must conduct thorough vulnerability assessments to identify all instances of affected software and ensure proper patch management protocols are in place. Network segmentation and monitoring solutions should be deployed to detect suspicious activities that may indicate exploitation attempts. Access control measures should be strengthened through multi-factor authentication and regular credential rotation to limit the impact of compromised accounts. Additionally, implementing content security policies and web application firewalls can provide additional layers of protection against XSS attacks. Regular security awareness training for administrators and users helps prevent social engineering attacks that might lead to credential compromise. The remediation process should include comprehensive testing to ensure that patches do not introduce regressions in application functionality while maintaining the security improvements necessary to address this vulnerability.