CVE-2021-34801: Denial of Service in Valine
Summary
CVE-2021-34801: Denial of service in Valine. Affects valine versions < 1.4.14. No fix is published. How to fix ↓
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Background
Valine is a fast, simple, and powerful comment system used by developers. It provides a convenient way to add commenting functionality to websites and applications. Valine 1.4.14 is the affected version that contains a vulnerability allowing remote attackers to cause a denial of service (application outage). This vulnerability is triggered by supplying a User-Agent (ua) value that only specifies the product and version.
Vulnerability Detail
The vulnerability in Valine 1.4.14 allows remote attackers to exploit the application by sending a specially crafted User-Agent value. By providing a User-Agent value that only specifies the product and version, the attacker can trigger a denial of service, resulting in an application outage. This vulnerability can potentially disrupt the availability of the affected application and impact user experience. The Common Weakness Enumeration (CWE) ID associated with this vulnerability is CWE-94.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, developers can implement input validation and sanitization for the User-Agent value. By ensuring that the User-Agent value contains valid and expected information, the vulnerability can be mitigated. Here is an example of how to validate the User-Agent value in JavaScript:
function validateUserAgent(userAgent) {
// Perform validation logic here
// Return true if the User-Agent is valid, false otherwise
}
const userAgent = req.headers['user-agent'];
if (validateUserAgent(userAgent)) {
// Process the request
} else {
// Handle the invalid User-Agent
}
Conclusion
In conclusion, Valine 1.4.14 is vulnerable to a denial of service attack that can be triggered by supplying a specific User-Agent value. To mitigate this vulnerability, it is crucial to upgrade to a version of Valine that is not affected by this issue. Additionally, implementing input validation and sanitization for the User-Agent value can provide an extra layer of protection. For further assistance and guidance on vulnerability remediation, please contact DevNack.com.
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FAQ
Valine is a fast, simple, and powerful comment system used by developers to add commenting functionality to websites and applications.
The vulnerability allows remote attackers to cause a denial of service, resulting in an application outage. This can disrupt the availability of the affected application and impact user experience.
To fix this vulnerability, it is recommended to upgrade the Valine package to a version beyond 1.4.14. This can be done by modifying the package.json file or using the package manager command to update the package.
Yes, developers can implement input validation and sanitization for the User-Agent value to mitigate the vulnerability. By ensuring that the User-Agent value contains valid and expected information, the impact of the vulnerability can be reduced.
For further support on vulnerability remediation, you can reach out to info@devnack.com. Our team will be happy to assist you.
References
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