CVE-2019-1749 : Exploit Details and Defense Strategies

A vulnerability in the validation of ingress traffic in Cisco IOS XE Software for Cisco Aggregation Services Router (ASR) 900 Route Switch Processor 3 (RSP3) could potentially lead to a denial of service (DoS) attack.

Understanding CVE-2019-1749

This CVE involves a flaw in the validation of ingress traffic in Cisco IOS XE Software for Cisco ASR 900 RSP3, which could be exploited by an adjacent unauthenticated attacker.

What is CVE-2019-1749?

The vulnerability arises due to inadequate validation of ingress traffic on the RSP3 platform's ASIC. An attacker could trigger a reload of the affected device by sending a malformed OSPFv2 message, causing a DoS situation.

The Impact of CVE-2019-1749

CVSS Base Score: 7.4 (High)
Attack Vector: Adjacent Network
Availability Impact: High
The vulnerability could lead to a DoS condition by causing a reload of the affected device.

Technical Details of CVE-2019-1749

Vulnerability Description

The flaw in the validation of ingress traffic in Cisco IOS XE Software for Cisco ASR 900 RSP3 could be exploited by an adjacent unauthenticated attacker, potentially leading to a DoS situation.

Affected Systems and Versions

Affected Product: Cisco IOS XE Software
Affected Versions: Multiple versions ranging from 3.13.6aS to 16.8.1c

Exploitation Mechanism

The attacker could exploit the vulnerability by sending a malformed OSPFv2 message to the susceptible device.

Mitigation and Prevention

Immediate Steps to Take

Apply the necessary security patches provided by Cisco.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly monitor and update network security measures.
Conduct security assessments and audits to identify vulnerabilities.

Patching and Updates

Ensure timely installation of security updates and patches provided by Cisco.