CVE-2022-32442 in u5cms
Summary
by MITRE • 06/17/2022
u5cms version 8.3.5 is vulnerable to Cross Site Scripting (XSS). When a user accesses the default home page if the parameter passed in is http://127.0.0.1/? "Onmouseover=%27tzgl (96502)%27bad=", it can cause html injection.
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Analysis
by VulDB Data Team • 06/17/2022
The vulnerability identified as CVE-2022-32442 affects u5cms version 8.3.5 and represents a critical cross site scripting flaw that enables remote attackers to inject malicious html content into web pages. This vulnerability manifests when users access the default home page of the content management system and encounter a specially crafted parameter that triggers the injection mechanism. The specific payload demonstrates how the application fails to properly sanitize user input, allowing attackers to execute malicious scripts within the context of the victim's browser session. The vulnerability stems from inadequate input validation and output encoding practices within the cms application's handling of url parameters.
The technical exploitation of this vulnerability occurs through the manipulation of url query parameters where the malicious input "Onmouseover=%27tzgl (96502)%27bad=" demonstrates a classic xss attack vector. The %27 character sequence represents the single quote encoding that, when processed by the vulnerable application, creates an executable script context within the html document. This flaw falls under CWE-79 which categorizes cross site scripting vulnerabilities as weaknesses in web applications that allow attackers to inject client-side scripts. The vulnerability enables attackers to perform actions such as stealing session cookies, defacing web pages, or redirecting users to malicious sites without the victim's knowledge.
The operational impact of this vulnerability is significant as it allows attackers to compromise user sessions and potentially gain unauthorized access to sensitive information. When users navigate to the affected page with the malicious parameter, the browser executes the injected html code which can lead to session hijacking, data theft, or malicious redirection. The vulnerability affects all users of the vulnerable u5cms version, making it particularly dangerous for web applications that rely on this platform for content management. The attack requires minimal user interaction beyond visiting the malicious page, making it a high-risk vulnerability that can be exploited at scale. According to ATT&CK framework, this vulnerability maps to T1531 which involves the use of malicious code to gain access to systems and T1059 which covers the execution of commands through various attack vectors including web-based injection techniques.
Mitigation strategies for this vulnerability should include immediate patching of the u5cms application to the latest version that addresses the input validation issues. Organizations should implement comprehensive input sanitization and output encoding mechanisms to prevent malicious scripts from being executed within the application context. The implementation of content security policies and proper html escaping techniques can significantly reduce the risk of exploitation. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar issues within the application stack. Network monitoring solutions should be configured to detect and alert on suspicious url patterns that may indicate attempts to exploit this vulnerability. The fix should involve proper parameter validation that rejects or sanitizes input containing potentially dangerous html characters and javascript code sequences.