CVE-2022-24717 in ssr-pages
Summary
by MITRE • 03/01/2022
ssr-pages is an HTML page builder for the purpose of server-side rendering (SSR). In versions prior to 0.1.5, a cross site scripting (XSS) issue can occur when providing untrusted input to the `redirect.link` property as an argument to the `build(MessagePageOptions)` function. While there is no known workaround at this time, there is a patch in version 0.1.5.
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Analysis
by VulDB Data Team • 03/04/2022
The ssr-pages library serves as a server-side rendering HTML page builder that enables developers to generate dynamic web content on the server before sending it to clients. This vulnerability affects versions prior to 0.1.5 where the library fails to properly sanitize user-provided input when processing the redirect.link property within the build(MessagePageOptions) function. The flaw represents a classic cross site scripting vulnerability that can be exploited by malicious actors to inject malicious scripts into web pages viewed by other users.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the ssr-pages library. When developers pass untrusted data through the redirect.link property, the library does not properly escape or filter special characters that could be interpreted as executable script code by web browsers. This occurs during the server-side rendering process where the library constructs HTML content based on user-provided parameters without sufficient security controls. The vulnerability specifically manifests when the build function processes the MessagePageOptions object, particularly the redirect.link property which becomes part of the generated HTML output.
The operational impact of this vulnerability is significant as it allows attackers to execute arbitrary JavaScript code in the context of affected websites. An attacker could craft malicious input that, when processed by the vulnerable ssr-pages library, would inject malicious scripts into the rendered HTML pages. This could lead to session hijacking, data theft, defacement of web content, or redirection to malicious sites. The vulnerability is particularly dangerous because it operates at the server-side rendering layer, meaning that the malicious code could affect all users who view the affected pages, potentially compromising large user bases.
This vulnerability maps to CWE-79, which specifically addresses Cross-Site Scripting flaws in software systems. The ATT&CK framework would categorize this under T1566.001 for initial access through malicious links, and potentially T1059.007 for command and control through script injection techniques. The lack of a known workaround in the affected versions means that organizations must immediately upgrade to version 0.1.5 or later to remediate the issue. Security teams should also implement monitoring for any suspicious input patterns that might indicate exploitation attempts, as well as conduct thorough code reviews to ensure no other similar vulnerabilities exist in related components. The patch released in version 0.1.5 addresses the core sanitization issue by implementing proper input validation and output encoding for the redirect.link property, preventing malicious code from being executed in the browser context.