CVE-2019-12649 : Exploit Details and Defense Strategies

Cisco IOS XE Software has identified a flaw in its Image Verification feature that could be exploited by a local attacker with authentication privileges to implant malicious software images or run unsigned binaries on affected devices.

Understanding CVE-2019-12649

This CVE involves a vulnerability in Cisco IOS XE Software that allows attackers to bypass digital signature verification during the boot process, potentially leading to the execution of malicious code.

What is CVE-2019-12649?

The vulnerability in Cisco IOS XE Software enables local attackers with authentication privileges to install and activate software images containing malicious elements or execute unsigned binary files on affected devices.

The Impact of CVE-2019-12649

CVSS Base Score: 6.7 (Medium Severity)
Attack Vector: Local
Attack Complexity: Low
Privileges Required: High
Confidentiality Impact: High
Integrity Impact: High
Availability Impact: High
This vulnerability could result in unauthorized installation of malicious software or execution of unsigned binaries, compromising the integrity and confidentiality of affected systems.

Technical Details of CVE-2019-12649

The following technical details provide insight into the vulnerability and its implications:

Vulnerability Description

The flaw allows attackers to configure devices in a way that bypasses digital signature verification during boot, facilitating the installation of malicious software images or execution of unsigned binaries.

Affected Systems and Versions

Affected Product: Cisco IOS XE Software 3.2.11aSG
Vendor: Cisco
Version: Unspecified

Exploitation Mechanism

Attackers exploit a specific feature in the device's boot process to bypass digital signature verification, enabling the installation of malicious software images or execution of unsigned binaries.

Mitigation and Prevention

To address CVE-2019-12649 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Apply vendor-supplied patches promptly
Monitor system logs for suspicious activities
Restrict access to critical devices

Long-Term Security Practices

Regularly update and patch software and firmware
Implement network segmentation and access controls
Conduct security training for personnel

Patching and Updates

Cisco has released patches to address this vulnerability
Regularly check for updates and apply them to ensure system security