CVE-2019-12654 : Exploit Details and Defense Strategies

A vulnerability in the Session Initiation Protocol (SIP) library of Cisco IOS and IOS XE Software could allow an unauthenticated attacker to cause a denial of service (DoS) by triggering a device reload.

Understanding CVE-2019-12654

This CVE involves a vulnerability in Cisco IOS and IOS XE Software that could lead to a denial of service condition.

What is CVE-2019-12654?

The vulnerability allows an unauthenticated remote attacker to disrupt service by causing a device reload through crafted SIP messages.
It stems from inadequate validation of an internal data structure, leading to a NULL pointer dereference and device crash.

The Impact of CVE-2019-12654

CVSS Base Score: 8.6 (High Severity)
Attack Vector: Network
Availability Impact: High
Successful exploitation could prompt a device reload, causing service disruption.

Technical Details of CVE-2019-12654

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises from insufficient checks on an internal data structure in the SIP library.

Affected Systems and Versions

Affected Product: Cisco IOS 15.0(1)XA2
Vendor: Cisco
Version: Unspecified

Exploitation Mechanism

Attacker sends crafted SIP messages to the device, leading to a NULL pointer dereference and device crash.

Mitigation and Prevention

Protecting systems from CVE-2019-12654 is crucial to prevent service disruptions.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Monitor network traffic for any suspicious SIP messages.

Long-Term Security Practices

Regularly update and patch software to address vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories from Cisco and apply patches as soon as they are available.