CVE-2020-3530 : What You Need to Know

A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local attacker to execute that command, even though administrative privileges should be required. The attacker must have valid credentials on the affected device. The vulnerability is due to incorrect mapping in the source code of task group assignments for a specific command. An attacker could exploit this vulnerability by issuing the command, which they should not be authorized to issue, on an affected device. A successful exploit could allow the attacker to invalidate the integrity of the disk and cause the device to restart. This vulnerability could allow a user with read permissions to issue a specific command that should require Administrator privileges.

Understanding CVE-2020-3530

This CVE involves an authenticated user privilege escalation vulnerability in Cisco IOS XR Software.

What is CVE-2020-3530?

The vulnerability allows a local attacker with valid credentials to execute a specific CLI command, bypassing the required administrative privileges. By exploiting this flaw, an attacker can disrupt the device's integrity and potentially force a restart.

The Impact of CVE-2020-3530

The vulnerability poses a high impact on availability and integrity, potentially leading to unauthorized command execution and device disruption.

Technical Details of CVE-2020-3530

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from incorrect task group assignment in the source code, enabling unauthorized command execution.

Affected Systems and Versions

Product: Cisco IOS XR Software
Vendor: Cisco
Affected Version: Not applicable

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Scope: Changed
Impact: High
CVSS Base Score: 8.4 (High)
Vector String: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Mitigation and Prevention

Effective measures to mitigate and prevent exploitation of the vulnerability.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Monitor network for any unauthorized access or unusual activities.

Long-Term Security Practices

Enforce the principle of least privilege to restrict unnecessary access.
Conduct regular security audits and assessments to identify vulnerabilities.

Patching and Updates

Regularly check for security advisories and updates from Cisco.
Implement a robust patch management process to ensure timely application of fixes.