CVE-2016-5394: Cross-Site Scripting in Apache Sling
Summary
CVE-2016-5394: Cross site scripting in Apache Sling. Affects org.apache.sling:org.apache.sling.xss versions < 1.0.12. Fixed in 1.0.12. How to fix ↓
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Background
Apache Sling is a web framework that allows developers to create content-oriented applications. It provides a set of tools and libraries for building RESTful web applications using Java. The Apache Sling XSS Protection API module is responsible for protecting against cross-site scripting (XSS) attacks by encoding user input. However, a vulnerability in the encoding process allows certain input patterns to bypass the encoding and potentially lead to XSS vulnerabilities.
Vulnerability Detail
The XSS Protection API module in Apache Sling, specifically the XSSAPI.encodeForJSString() method, does not apply strict enough encoding for certain input patterns. This allows script tags to pass through unencoded, making it possible for an attacker to inject malicious scripts into web pages. This can lead to various consequences, such as session hijacking, defacement of web pages, or stealing sensitive user information.
How To Fix
Minimum fixed version
1.0.12
This is the first release that contains the fix.
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Workaround
If upgrading the package is not immediately feasible, a temporary workaround is to manually sanitize user input before using it in web pages. This can be done by applying appropriate encoding or escaping techniques to ensure that any potentially malicious scripts are neutralized. Here is an example of how to sanitize user input in Java:
String sanitizedInput = StringEscapeUtils.escapeHtml4(userInput);
Conclusion
In conclusion, the Apache Sling XSS Protection API module is vulnerable to a cross-site scripting (XSS) attack due to insufficient encoding. Upgrading to version 1.0.12 or later of the org.apache.sling.xss package is recommended to mitigate this vulnerability. If immediate upgrade is not possible, manual sanitization of user input can serve as a temporary workaround. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
Apache Sling is a web framework that allows developers to create content-oriented applications. It provides a set of tools and libraries for building RESTful web applications using Java.
Cross-site scripting (XSS) is a type of security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. This can lead to various consequences, such as session hijacking, defacement of web pages, or stealing sensitive user information.
The XSS Protection API module in Apache Sling provides a set of methods for encoding user input to prevent XSS attacks. The encodeForJSString() method is specifically designed to encode input for use in JavaScript strings.
This vulnerability allows an attacker to inject malicious scripts into web pages, potentially leading to session hijacking, defacement of web pages, or stealing sensitive user information.
To fix this vulnerability, upgrade the org.apache.sling.xss package to version 1.0.12 or later. This version includes stricter encoding rules that prevent script tags from bypassing the encoding process.
References
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