CVE-2019-1697 : Vulnerability Insights and Analysis

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Lightweight Directory Access Protocol Denial of Service Vulnerability

Understanding CVE-2019-1697

A vulnerability in the LDAP feature implementation in Cisco ASA Software and FTD Software could allow an unauthenticated remote attacker to trigger a device restart, leading to a denial of service (DoS) situation.

What is CVE-2019-1697?

The flaw in LDAP implementation in Cisco ASA Software and FTD Software allows an attacker to send a crafted LDAP packet, causing the affected device to restart, resulting in a DoS condition.

The Impact of CVE-2019-1697

Attack Complexity: High
Attack Vector: Network
Availability Impact: High
Base Score: 6.8 (Medium Severity)
Scope: Changed
Vector String: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Technical Details of CVE-2019-1697

Affecting Cisco ASA Software and FTD Software

Vulnerability Description

Incorrect interpretation of LDAP packets leads to device restart
Attacker can exploit by sending crafted LDAP packet using Basic Encoding Rules (BER)

Affected Systems and Versions

Product: Cisco Adaptive Security Appliance (ASA) Software
Versions Affected: Less than 9.6(4.21)
Vendor: Cisco

Exploitation Mechanism

Attacker sends specially crafted LDAP packet to affected device
Utilizes Basic Encoding Rules (BER) for processing

Mitigation and Prevention

Steps to Address CVE-2019-1697

Immediate Steps to Take

Apply vendor patches and updates promptly
Monitor network traffic for any suspicious LDAP activities
Implement network segmentation to limit exposure

Long-Term Security Practices

Regularly update and patch all software and firmware
Conduct security training for staff on identifying phishing and social engineering attacks

Patching and Updates

Refer to Cisco's security advisory for specific patch details
Regularly check for updates and apply them to mitigate the vulnerability