CVE-2019-1754 : Exploit Details and Defense Strategies

Cisco IOS XE Software Privilege Escalation Vulnerability

Understanding CVE-2019-1754

A weakness in the authorization subsystem of Cisco IOS XE Software could allow a remote attacker with low privileges to execute elevated commands through the web UI.

What is CVE-2019-1754?

The vulnerability in Cisco IOS XE Software allows an authenticated but unprivileged attacker to run privileged commands via the web UI due to incorrect user privilege verification.

The Impact of CVE-2019-1754

CVSS Score: 8.8 (High)
Attack Vector: Network
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2019-1754

Affecting Cisco IOS XE Software versions, the vulnerability enables unauthorized execution of commands.

Vulnerability Description

The flaw arises from improper validation of user privileges in the web UI, allowing attackers to send malicious payloads to gain elevated privileges.

Affected Systems and Versions

Cisco IOS XE Software versions 3.2.0JA, 16.7.1, 16.7.1a, 16.7.1b, 16.8.1, 16.8.1a, 16.8.1b, 16.8.1s, 16.8.1c, 16.8.1d, 16.8.2, 16.8.1e, 16.9.1b, 16.9.1s, 16.9.1c, 16.9.1d

Exploitation Mechanism

Attackers can exploit the vulnerability by sending a crafted payload to a specific web UI endpoint, granting them unauthorized access to execute commands with elevated privileges.

Mitigation and Prevention

Immediate Steps to Take:

Apply vendor-provided patches
Monitor network traffic for signs of exploitation

Long-Term Security Practices:

Regularly update software and firmware
Implement network segmentation and access controls

Patching and Updates:

Cisco has released patches to address this vulnerability