CVE-2019-5256 Explained : Impact and Mitigation

A null pointer dereference vulnerability has been identified in several Huawei products. This vulnerability could be exploited by a local attacker to cause a denial of service and trigger a process reboot.

Understanding CVE-2019-5256

What is CVE-2019-5256?

This CVE refers to a null pointer dereference vulnerability found in various Huawei products, potentially leading to a denial of service.

The Impact of CVE-2019-5256

The successful exploitation of this vulnerability could result in a denial of service and cause the affected process to reboot.

Technical Details of CVE-2019-5256

Vulnerability Description

A null pointer dereference vulnerability in Huawei products
Occurs when the system attempts to access a NULL pointer
Exploitable by a local attacker with crafted parameters

Affected Systems and Versions

Products: AP2000, IPS Module, NGFW Module, NIP6300, NIP6600, NIP6800, S5700, SVN5600, SVN5800, and more
Vulnerable Versions: V200R005C30, V200R006C10, V200R006C20, and others

Exploitation Mechanism

Attacker with local access privileges sends specially crafted parameters
System dereferences a pointer expected to be valid but is NULL

Mitigation and Prevention

Immediate Steps to Take

Apply patches provided by Huawei
Monitor security advisories for updates

Long-Term Security Practices

Regularly update and patch all software and firmware
Implement strong access controls and network segmentation

Patching and Updates

Huawei has released patches to address this vulnerability
Ensure all affected systems are updated with the latest patches