CVE-2018-0438 : Security Advisory and Response

A vulnerability in the Cisco Umbrella Enterprise Roaming Client (ERC) allows an authenticated local attacker to escalate privileges to Administrator level by exploiting file system permissions.

Understanding CVE-2018-0438

This CVE involves a privilege escalation vulnerability in the Cisco Umbrella Enterprise Roaming Client (ERC) that could lead to an attacker gaining Administrator privileges.

What is CVE-2018-0438?

The flaw in Cisco Umbrella ERC enables a local attacker with authentication to elevate their privileges to Administrator by improperly storing and executing files in restricted directories.

The Impact of CVE-2018-0438

The vulnerability allows an attacker to run malicious code with elevated privileges, potentially leading to unauthorized access and control over the affected system.

Technical Details of CVE-2018-0438

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The vulnerability arises from the incorrect implementation of file system permissions, enabling non-administrative users to store and execute files in restricted directories.

Affected Systems and Versions

Product: Cisco Umbrella
Vendor: Cisco
Version: Not applicable

Exploitation Mechanism

Attacker authenticates with valid local user credentials
Stores an executable file in a restricted directory
When executed by the ERC client, the file runs with Administrator privileges

Mitigation and Prevention

To address CVE-2018-0438, follow these mitigation strategies:

Immediate Steps to Take

Apply the vendor-provided patches or updates
Monitor and restrict access to sensitive directories
Implement the principle of least privilege

Long-Term Security Practices

Regularly update and patch software and systems
Conduct security training for users on best practices

Patching and Updates

Cisco may release patches or updates to fix the vulnerability
Stay informed about security advisories and apply patches promptly