CVE-2023-50981 Explained : Impact and Mitigation

This article provides detailed information on CVE-2023-50981, a vulnerability in ModularSquareRoot in Crypto++ (aka cryptopp).

Understanding CVE-2023-50981

CVE-2023-50981 relates to a denial of service vulnerability in Crypto++ through version 8.9.0. Attackers can exploit this issue to cause an infinite loop by using specially crafted DER public-key data.

What is CVE-2023-50981?

CVE-2023-50981, also known as ModularSquareRoot in Crypto++ vulnerability, allows attackers to trigger a denial of service condition. By manipulating DER public-key data associated with specific squared odd numbers, such as the square of 268995137513890432434389773128616504853, attackers can force the application into an infinite loop.

The Impact of CVE-2023-50981

The impact of this vulnerability is significant as it can lead to a denial of service, rendering the affected system unresponsive. This could disrupt critical operations and services, causing downtime and affecting user experience.

Technical Details of CVE-2023-50981

CVE-2023-50981 involves a vulnerability in the ModularSquareRoot function within Crypto++. When the application processes specially crafted DER public-key data related to certain squared odd numbers, it enters into an infinite loop, consuming system resources and causing a denial of service.

Vulnerability Description

The vulnerability arises due to improper handling of squared odd numbers in the ModularSquareRoot function, leading to an infinite loop condition and subsequent denial of service.

Affected Systems and Versions

All versions of Crypto++ up to and including 8.9.0 are affected by CVE-2023-50981. Systems using these versions are at risk of exploitation if they process DER public-key data containing squared odd numbers.

Exploitation Mechanism

To exploit CVE-2023-50981, attackers need to provide specially crafted DER public-key data associated with specific squared odd numbers. By sending this malicious input to a vulnerable system running Crypto++, an attacker can trigger the infinite loop and achieve a denial of service.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-50981, it is essential to take immediate steps for remediation and implement long-term security practices.

Immediate Steps to Take

Update Crypto++ to a patched version that addresses CVE-2023-50981.
Monitor system performance for any signs of unusual behavior that could indicate a denial of service attack.

Long-Term Security Practices

Regularly update software and libraries to ensure the latest security patches are applied.
Conduct security assessments and penetration testing to identify and address potential vulnerabilities.

Patching and Updates

Crypto++ has released a patch to fix the vulnerability in version 8.9.1. It is crucial for users to promptly apply this patch to eliminate the risk of exploitation and secure their systems.