CVE-2021-27522 : Vulnerability Insights and Analysis

Learnsite 1.2.5.0 has a remote privilege escalation vulnerability in /Manager/index.aspx due to the JudgIsAdmin() function. Exploiting the vulnerability allows obtaining the administrator cookie key by modifying a user cookie key's initial letter.

Understanding CVE-2021-27522

This section delves into the details of the CVE-2021-27522 vulnerability.

What is CVE-2021-27522?

CVE-2021-27522 refers to a remote privilege escalation vulnerability in Learnsite 1.2.5.0 that can lead to unauthorized access to administrator privileges.

The Impact of CVE-2021-27522

Exploiting this vulnerability enables threat actors to elevate their user privileges to that of an administrator, potentially leading to unauthorized access to sensitive information and malicious activities.

Technical Details of CVE-2021-27522

Here are the technical details associated with CVE-2021-27522.

Vulnerability Description

The vulnerability in Learnsite 1.2.5.0 occurs in /Manager/index.aspx through the JudgIsAdmin() function, allowing the manipulation of user cookies to obtain the administrator cookie key.

Affected Systems and Versions

The vulnerability impacts Learnsite version 1.2.5.0.

Exploitation Mechanism

By modifying the initial letter of a user cookie key, threat actors can exploit the vulnerability to gain access to the administrator cookie key.

Mitigation and Prevention

To secure your system against CVE-2021-27522, follow these mitigation strategies.

Immediate Steps to Take

Disable access to /Manager/index.aspx until a patch is available.
Monitor user cookies for any suspicious modifications.

Long-Term Security Practices

Regularly update Learnsite to the latest version to patch known vulnerabilities.
Implement strict cookie security practices to prevent unauthorized access.

Patching and Updates

Keep track of security advisories and patches provided by Learnsite to address CVE-2021-27522.