CVE-2019-1714 : Exploit Details and Defense Strategies

A weakness has been detected in the implementation of Security Assertion Markup Language (SAML) 2.0 Single Sign-On (SSO) for Clientless SSL VPN (WebVPN) and AnyConnect Remote Access VPN in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software. This vulnerability could potentially enable an unauthorized and remote attacker to establish a VPN session with an affected device. The vulnerability stems from improper management of credentials when utilizing NT LAN Manager (NTLM) or basic authentication. Exploitation of this vulnerability involves the attacker initiating a VPN session to an affected device following the successful authentication of another VPN user through SAML SSO. If successfully exploited, the attacker could gain access to secured networks situated behind the affected device.

Understanding CVE-2019-1714

This CVE identifies a vulnerability in Cisco ASA and FTD Software that could allow unauthorized VPN access to affected devices.

What is CVE-2019-1714?

The vulnerability in SAML 2.0 SSO implementation in Cisco ASA and FTD Software allows remote attackers to establish VPN sessions without proper authentication.

The Impact of CVE-2019-1714

The vulnerability could lead to unauthorized access to secured networks behind affected devices, posing a significant security risk.

Technical Details of CVE-2019-1714

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from improper credential management during SAML SSO authentication, enabling attackers to exploit the system.

Affected Systems and Versions

Cisco Adaptive Security Appliance (ASA) Software versions less than 9.8.4, 9.9.2.50, and 9.10.1.17 are affected.
Cisco Firepower Threat Defense (FTD) Software versions less than 6.2.3.12 and 6.3.0.3 are impacted.

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Base Score: 5.8 (Medium)
Integrity Impact: Low
Privileges Required: None
Scope: Changed
User Interaction: None
Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Mitigation and Prevention

Protecting systems from CVE-2019-1714 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-recommended patches promptly.
Monitor network traffic for any suspicious activities.
Implement strong authentication mechanisms.

Long-Term Security Practices

Regularly update and patch software and firmware.
Conduct security audits and assessments periodically.
Educate users on secure VPN usage and best practices.

Patching and Updates

Cisco has released patches to address the vulnerability. Ensure all affected systems are updated with the latest security fixes.