CVE-2019-1741 Explained : Impact and Mitigation

Cisco IOS XE Software contains a flaw in the Cisco Encrypted Traffic Analytics (ETA) feature, potentially leading to a denial of service (DoS) attack. The vulnerability allows an unauthorized attacker to exploit a logic error during packet processing, causing the affected device to reboot.

Understanding CVE-2019-1741

This CVE involves a vulnerability in Cisco IOS XE Software that could be exploited to trigger a DoS scenario.

What is CVE-2019-1741?

The vulnerability in Cisco IOS XE Software's ETA feature allows attackers to send specially crafted IP packets to a vulnerable device, leading to a DoS situation by forcing the device to reboot.

The Impact of CVE-2019-1741

The vulnerability has a CVSS base score of 8.6, indicating a high severity level. If successfully exploited, it could result in a DoS scenario by causing the affected device to reboot.

Technical Details of CVE-2019-1741

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in Cisco IOS XE Software's ETA feature arises from a logic error during packet processing, allowing unauthorized access to internal data structures even after release.

Affected Systems and Versions

Cisco IOS XE Software versions 3.2.0JA, 16.6.1, 16.6.2, 16.6.3, 16.7.1, 16.7.1a, 16.7.1b, 16.8.1, 16.8.1a, 16.8.1b, 16.8.1s, 16.8.1c, 16.8.1d, 16.8.1e

Exploitation Mechanism

Attackers exploit the vulnerability by sending specially crafted IP packets to a vulnerable device, triggering a reboot and causing a DoS situation.

Mitigation and Prevention

Protecting systems from CVE-2019-1741 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly to mitigate the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch all software and firmware to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Cisco has likely released patches or updates to address the vulnerability. Ensure timely application of these fixes to secure the affected systems.