CVE-2020-9447: Cross-site Scripting in GwtUpload
Summary
CVE-2020-9447: Cross-site Scripting in GwtUpload. Affects com.googlecode.gwtupload:gwtupload versions < 1.0.3. No fix is published. How to fix ↓
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Background
GwtUpload is a file-upload feature in GWT (Google Web Toolkit) that allows developers to easily implement file upload functionality in their web applications. It provides a user-friendly interface for uploading files to the server. However, GwtUpload version 1.0.3 is vulnerable to a cross-site scripting (XSS) attack.
Vulnerability Detail
The vulnerability in GwtUpload 1.0.3 arises from a lack of proper input validation on the filename parameter during file uploads. An attacker can exploit this by uploading a file with a crafted filename that contains malicious JavaScript code. When the file is accessed or displayed, the injected code will be executed in the context of the victim's browser, potentially leading to unauthorized actions or data theft. The severity of this vulnerability is rated as MODERATE with a CVSS score of 6.1.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, developers can manually sanitize and validate filenames before processing them. This can be done by implementing server-side checks to ensure that filenames do not contain any potentially malicious characters or scripts. Additionally, output encoding should be applied when displaying filenames to prevent script execution.
Conclusion
The GwtUpload library version 1.0.3 is vulnerable to a cross-site scripting (XSS) attack due to insufficient input validation on filenames during file uploads. To mitigate this vulnerability, it is crucial to upgrade to a patched version of GwtUpload and implement proper input validation and output encoding techniques. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
GwtUpload is a file-upload feature in GWT (Google Web Toolkit) that allows developers to easily implement file upload functionality in their web applications.
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 unauthorized actions or data theft.
This vulnerability is rated as MODERATE with a CVSS score of 6.1.
To fix this vulnerability, it is recommended to upgrade to a version of GwtUpload that includes a patch for this issue. Developers should also implement proper input validation and output encoding techniques.
As a temporary workaround, developers can manually sanitize and validate filenames before processing them. Additionally, output encoding should be applied when displaying filenames to prevent script execution.
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