CVE-2021-25299 : Exploit Details and Defense Strategies
Learn about CVE-2021-25299 affecting Nagios XI version xi-5.7.5. Understand the impact, technical details, and mitigation steps to secure your systems from this XSS vulnerability.
Nagios XI version xi-5.7.5 is affected by a cross-site scripting (XSS) vulnerability due to improper sanitization of user-controlled input in the file sshterm.php. This flaw could allow an attacker to steal session cookies or achieve remote code execution (RCE) on the Nagios XI server.
Understanding CVE-2021-25299
This CVE identifies a security issue in Nagios XI version xi-5.7.5 that could be exploited by attackers to execute malicious actions on the affected server.
What is CVE-2021-25299?
Nagios XI version xi-5.7.5 is prone to cross-site scripting (XSS) due to a lack of proper input sanitization in the file sshterm.php. This vulnerability allows an attacker to craft a URL to perform unauthorized actions on the server.
The Impact of CVE-2021-25299
Exploiting this vulnerability can result in unauthorized access to session cookies of admin users or potentially enable attackers to achieve remote code execution (RCE) on the Nagios XI server.
Technical Details of CVE-2021-25299
This section covers the specific technical details of the CVE.
Vulnerability Description
The vulnerability in Nagios XI version xi-5.7.5 exists due to improper input sanitization of user-controlled data in the file sshterm.php, making it susceptible to cross-site scripting attacks.
Affected Systems and Versions
Nagios XI version xi-5.7.5 is the affected version by this CVE.
Exploitation Mechanism
By exploiting the cross-site scripting vulnerability in sshterm.php, attackers can trick admin users into clicking malicious URLs, leading to the theft of session cookies or potential remote code execution on the Nagios XI server.
Mitigation and Prevention
To protect systems from CVE-2021-25299, users and administrators should take immediate and long-term security measures.
Immediate Steps to Take
Update Nagios XI to a patched version or apply relevant security updates. Additionally, restrict access to the affected files and directories to prevent unauthorized exploitation.
Long-Term Security Practices
Regularly monitor and audit user input to detect and mitigate any input validation issues. Conduct security training for admin users to enhance awareness of phishing attacks.
Patching and Updates
Stay informed about security patches released by Nagios and apply them promptly to address known vulnerabilities and protect systems.