CVE-2023-39318: Vulnerability in stdlib package - Improper handling of HTML-like comments within script contexts
Summary
CVE-2023-39318: The html/template package does not properly handle HTML-like "" comment tokens, nor hashbang "#!" comment tokens, in contexts. Affects golang-1.15 versions < d5b851804329aa547dafa278a0c35dd62298d651. No fix is published. How to fix ↓
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Background
The stdlib package is a part of the Go programming language and provides a collection of standard libraries for various functionalities. It includes modules for file I/O, networking, cryptography, and more. The package is widely used in Go applications and is an integral part of the Go ecosystem. However, a vulnerability has been discovered in the html/template module of the stdlib package, which can lead to improper handling of HTML-like comments within script contexts.
Vulnerability Detail
The html/template module in the stdlib package does not properly handle HTML-like "" comment tokens and hashbang "#!" comment tokens within <script> contexts. This can result in the template parser misinterpreting the contents of <script> contexts, leading to actions being improperly escaped. Exploiting this vulnerability can allow an attacker to perform cross-site scripting (XSS) attacks. The vulnerability has a CVSS score of 6.1, indicating a medium severity level.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, developers can mitigate the risk by ensuring that user-generated content is properly sanitized and validated before being rendered within <script> contexts. Implementing strict input validation and output encoding can help prevent potential XSS attacks.
Conclusion
The vulnerability in the stdlib package's html/template module can lead to improper handling of HTML-like comments within script contexts, potentially enabling cross-site scripting (XSS) attacks. It is crucial for developers to update their applications to use the fixed versions of the stdlib package and implement proper input validation and output encoding to mitigate the risk. For further support and assistance in vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The vulnerability allows an attacker to perform cross-site scripting (XSS) attacks by improperly escaping actions within <script> contexts. This can lead to the execution of malicious scripts on the victim's browser, potentially compromising sensitive information or performing unauthorized actions.
To determine if your application is affected, you can use the Vulert Playground (https://vulert.com/scanner) without any signup. Vulert analyzes your manifest file, such as package-lock.json, to identify and alert in real-time for open-source vulnerabilities, including this specific vulnerability.
At the time of this report, there are no known public exploits available for this vulnerability. However, it is crucial to apply the recommended fixes promptly to mitigate the risk of potential attacks.
The primary solution is to update the stdlib package to the fixed versions. However, if updating the package is not feasible in the short term, developers can implement strict input validation and output encoding to mitigate the risk of XSS attacks within <script> contexts.
You can find more information about this vulnerability, including the CVE identifier, on the NIST National Vulnerability Database (NVD) website: https://nvd.nist.gov/vuln/detail/CVE-2023-39318
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