CVE-2017-15717: Cross-site Scripting in Apache Sling XSS Protection API
Summary
CVE-2017-15717: Cross-site Scripting in Apache Sling XSS Protection API. Affects org.apache.sling:org.apache.sling.xss versions >= 1.0.4, < 2.0.4. Fixed in 2.0.4. How to fix ↓
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Background
The Apache Sling XSS Protection API is a library that provides protection against cross-site scripting (XSS) attacks in Apache Sling applications. It offers various methods for escaping and encoding URLs to prevent the execution of malicious scripts. However, versions 1.0.4 to 1.0.18 of the API, as well as version 1.1.0 of the API Compat and version 2.0.0 of the API, contain a vulnerability that allows specially crafted URLs to bypass the XSS protection and execute XSS payloads.
Vulnerability Detail
The vulnerability arises from a flaw in the URL escaping and encoding process within the org.apache.sling.xss.impl.XSSAPIImpl#getValidHref and org.apache.sling.xss.impl.XSSFilterImpl#isValidHref methods. Attackers can exploit this flaw by crafting URLs that carry XSS payloads, which are mistakenly considered valid by the affected versions of the API. This can lead to the execution of malicious scripts in the context of the vulnerable application, potentially compromising user data and system integrity. The vulnerability has a CVSS score of 6.1 (Moderate).
How To Fix
Minimum fixed version
2.0.4
This is the first release that contains the fix.
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Workaround
There is no known workaround for this vulnerability. It is essential to upgrade to a fixed version of the Apache Sling XSS Protection API to mitigate the risk of XSS attacks.
Conclusion
In conclusion, the Apache Sling XSS Protection API is vulnerable to a cross-site scripting (XSS) attack due to a flaw in the URL escaping and encoding process. This vulnerability can be mitigated by upgrading to version 2.0.4 or a subsequent secure version of the API. It is recommended to promptly update affected applications to ensure the proper protection against XSS attacks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Apache Sling XSS Protection API is a library that provides protection against cross-site scripting (XSS) attacks in Apache Sling applications. It offers methods for escaping and encoding URLs to prevent the execution of malicious scripts.
Versions 1.0.4 to 1.0.18 of the API, as well as version 1.1.0 of the API Compat and version 2.0.0 of the API, are affected by this vulnerability.
The vulnerability allows attackers to execute cross-site scripting (XSS) attacks in the context of the vulnerable application. This can lead to the compromise of user data and system integrity.
The CVSS score of this vulnerability is 6.1 (Moderate).
No, there is no known workaround for this vulnerability. It is crucial to upgrade to a fixed version of the Apache Sling XSS Protection API.
References
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