CVE-2021-22948 : Security Advisory and Response

A vulnerability was discovered in the generation of session IDs in revive-adserver prior to version 5.3.0. This vulnerability is based on the use of the cryptographically insecure uniqid() PHP function. An attacker, under certain circumstances, could potentially brute force session IDs to hijack a specific account.

Understanding CVE-2021-22948

This section will cover what CVE-2021-22948 entails and its potential impact.

What is CVE-2021-22948?

CVE-2021-22948 is a vulnerability in the generation of session IDs in revive-adserver versions before 5.3.0. It is caused by the insecure use of the uniqid() PHP function, which could allow attackers to brute force session IDs.

The Impact of CVE-2021-22948

The impact of this vulnerability is that under specific conditions, malicious actors could exploit it to take control of a particular account.

Technical Details of CVE-2021-22948

In this section, we will delve into the technical aspects of CVE-2021-22948.

Vulnerability Description

The vulnerability stems from the improper generation of session IDs in revive-adserver versions prior to 5.3.0, leveraging the cryptographically insecure uniqid() PHP function.

Affected Systems and Versions

Revive-adserver versions below 5.3.0 are affected by this vulnerability.

Exploitation Mechanism

Attackers could potentially exploit this vulnerability by brute-forcing session IDs to compromise specific user accounts.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-22948, certain steps can be taken.

Immediate Steps to Take

Users are advised to update their revive-adserver installations to version 5.3.0 or above to eliminate this vulnerability.

Long-Term Security Practices

Implement secure cryptographic functions for session ID generation and regularly update software to prevent such vulnerabilities in the future.

Patching and Updates

Regularly check for updates from revive-adserver and apply patches promptly to ensure your system is protected.