CVE-2018-0101 Explained : Impact and Mitigation

A vulnerability in the Secure Sockets Layer (SSL) VPN function of the Cisco Adaptive Security Appliance (ASA) Software allows an attacker to potentially execute code or cause a system reload without authentication.

Understanding CVE-2018-0101

This CVE involves a flaw in the SSL VPN function of Cisco ASA Software, enabling unauthorized attackers to exploit the system.

What is CVE-2018-0101?

The vulnerability arises from a memory region being mistakenly freed twice when the webvpn feature is activated on the Cisco ASA device. Attackers can exploit this by sending specially crafted XML packets to a webvpn-configured interface, potentially leading to code execution or system reload.

The Impact of CVE-2018-0101

Successful exploitation could grant attackers the ability to execute arbitrary code, gain complete control over the system, or cause the affected device to reload. The vulnerability affects various Cisco products running ASA Software.

Technical Details of CVE-2018-0101

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability allows unauthenticated remote attackers to execute code or cause system reloads due to a memory double-free issue when the webvpn feature is enabled on Cisco ASA devices.

Affected Systems and Versions

Cisco ASA Software on multiple products including ASA 5500 Series, ASA 5500-X Series, and Firepower Threat Defense Software are impacted by this vulnerability.

Exploitation Mechanism

Exploiting this vulnerability involves sending crafted XML packets to a webvpn-configured interface on the affected system, enabling attackers to execute arbitrary code or reload the device.

Mitigation and Prevention

Protecting systems from CVE-2018-0101 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches and updates provided by Cisco to address the vulnerability.
Monitor network traffic for any signs of exploitation attempts.
Restrict network access to potentially vulnerable interfaces.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the attack surface.

Patching and Updates

Cisco has released patches to mitigate the vulnerability, and users are advised to apply these updates promptly to secure their systems.