CVE-2022-38972 in Type plugin A-Form
Summary
by MITRE • 09/12/2022
Cross-site scripting vulnerability in Movable Type plugin A-Form versions prior to 4.1.1 (for Movable Type 7 Series) and versions prior to 3.9.1 (for Movable Type 6 Series) allows a remote unauthenticated attacker to inject an arbitrary script.
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Analysis
by VulDB Data Team • 10/15/2022
This cross-site scripting vulnerability exists in the A-Form plugin for Movable Type content management systems, specifically affecting versions prior to 4.1.1 for Movable Type 7 Series and 3.9.1 for Movable Type 6 Series. The flaw represents a classic reflected cross-site scripting vulnerability that occurs when user input is not properly sanitized before being rendered in web pages. Attackers can exploit this weakness by crafting malicious payloads that get executed in the context of other users' browsers when they view affected pages. The vulnerability is particularly concerning because it requires no authentication, making it accessible to any remote attacker who can identify vulnerable installations.
The technical implementation of this XSS flaw involves improper input validation within the A-Form plugin's handling of user-supplied data. When form submissions or parameters are processed by the plugin without adequate sanitization or output encoding, malicious scripts can be injected into the web response. This allows attackers to execute arbitrary JavaScript code in victims' browsers, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications. From an operational perspective, this weakness creates a persistent threat vector that can be exploited across multiple user sessions and can potentially escalate to more severe attacks.
The impact of this vulnerability extends beyond simple script execution as it enables attackers to leverage the compromised user sessions for further malicious activities. A successful exploitation could allow attackers to steal authentication cookies, modify content, or redirect users to phishing sites. The attack surface is particularly wide since Movable Type installations are often used for content management and form processing, making them attractive targets for attackers seeking to compromise user sessions. According to ATT&CK framework, this vulnerability maps to T1566.001 which covers social engineering through phishing, as attackers could use this XSS to create convincing phishing pages or redirect users to malicious sites. The lack of authentication requirements makes this vulnerability particularly dangerous as it can be exploited at scale without requiring any initial access privileges.
Organizations should immediately upgrade to the patched versions of the A-Form plugin for their respective Movable Type series to remediate this vulnerability. The recommended mitigation strategy includes implementing proper input validation and output encoding mechanisms throughout the application. Security teams should also consider deploying web application firewalls to detect and block suspicious script injection attempts. Additionally, regular security assessments of web applications should include testing for XSS vulnerabilities using automated scanning tools and manual penetration testing techniques. The vulnerability demonstrates the critical importance of maintaining up-to-date software components and implementing robust security practices throughout the application lifecycle. Organizations should also implement content security policies to further mitigate the impact of potential XSS attacks and establish monitoring procedures to detect suspicious activities related to form processing and user input handling.