CVE-2018-0251 Explained : Impact and Mitigation
Learn about CVE-2018-0251, a vulnerability in Cisco ASA Software allowing XSS attacks. Find out affected systems, exploitation details, and mitigation steps.
A vulnerability in the Clientless Secure Sockets Layer (SSL) VPN portal's Web Server Authentication Required screen in Cisco Adaptive Security Appliance (ASA) Software could allow an unauthorized attacker to conduct a cross-site scripting (XSS) attack.
Understanding CVE-2018-0251
This CVE involves a flaw in the Web Server Authentication Required screen of the SSL VPN portal in Cisco ASA Software, potentially enabling a cross-site scripting attack.
What is CVE-2018-0251?
The vulnerability arises from inadequate validation of user-supplied input in the web-based interface, allowing an attacker to execute arbitrary script code or access sensitive information.
The Impact of CVE-2018-0251
- Unauthorized attackers can carry out XSS attacks against users of the affected device's portal.
- Successful exploitation could lead to the execution of arbitrary script code within the portal's context or access to sensitive browser-based information.
Technical Details of CVE-2018-0251
This section provides more technical insights into the vulnerability.
Vulnerability Description
- The flaw allows attackers to exploit insufficient validation of user-supplied input in the SSL VPN portal's Web Server Authentication Required screen.
Affected Systems and Versions
- Cisco products running vulnerable versions of ASA Software are impacted, including ASA 5500 Series, ASA 5500-X Series, and more.
Exploitation Mechanism
- Attackers need to persuade a user to click on a specially crafted link to exploit the vulnerability.
Mitigation and Prevention
Steps to address and prevent the CVE.
Immediate Steps to Take
- Apply patches provided by Cisco to address the vulnerability.
- Educate users to avoid clicking on suspicious links.
Long-Term Security Practices
- Regularly update and patch Cisco ASA Software to prevent vulnerabilities.
- Implement security awareness training to mitigate social engineering attacks.
Patching and Updates
- Stay informed about security advisories from Cisco and apply patches promptly.