Denial of Service Vulnerability in php-phpseclib3: CVE-2023-49316
Summary
UBUNTU-CVE-2023-49316: In Math/BinaryField.php in phpseclib 3 before 3.0.34, excessively large degrees can lead to a denial of service. Affects php-phpseclib3 versions 3.0.10-1 – 3.0.9-1. No fix is published. How to fix ↓
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Background
php-phpseclib3 is a popular library for secure communications in PHP, providing cryptographic functions and protocols. It is widely used in various applications for tasks such as encryption, decryption, and secure data transmission. The library is designed to be easy to use and integrate into PHP projects, making it a go-to choice for developers needing secure functionality. However, it has been identified to have a vulnerability that can lead to denial of service under certain conditions.
Vulnerability Detail
The vulnerability, identified as CVE-2023-49316, exists in the Math/BinaryField.php file of phpseclib 3 versions prior to 3.0.34. It allows attackers to exploit excessively large degrees, which can result in a denial of service. This means that an attacker could potentially cause the application to become unresponsive or crash, impacting the availability of the service. The issue arises from improper handling of input values that exceed expected limits, leading to resource exhaustion.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the package is not immediately possible, consider implementing input validation to restrict the size of degrees being processed. This can help mitigate the risk of denial of service by ensuring that excessively large inputs are not accepted by the application.
Conclusion
CVE-2023-49316 is a significant vulnerability in the php-phpseclib3 library that can lead to denial of service. It is crucial for developers using this library to update to the latest version to ensure their applications remain secure. Monitoring tools like Vulert can assist in identifying vulnerabilities in your software.
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FAQ
CVE-2023-49316 is a vulnerability in the php-phpseclib3 library that can lead to denial of service due to excessively large degrees.
Versions of php-phpseclib3 prior to 3.0.34 are affected by this vulnerability.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
The main consequence is denial of service, which can make your application unresponsive or crash, affecting user access and functionality.
The best protection is to update to the latest patched version of php-phpseclib3. Additionally, implementing input validation can help mitigate risks.
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