CVE-2021-31400 : What You Need to Know
Learn about CVE-2021-31400, a vulnerability in tcp_pulloutofband() in HCC embedded InterNiche 4.0.1 that could lead to a DoS condition. Find out the impact, affected systems, and mitigation steps.
An issue was discovered in tcp_pulloutofband() in tcp_in.c in HCC embedded InterNiche 4.0.1, leading to a denial of service (DoS) vulnerability.
Understanding CVE-2021-31400
This CVE describes a vulnerability in the TCP out-of-band urgent-data processing function in HCC embedded InterNiche 4.0.1 that can result in a DoS condition.
What is CVE-2021-31400?
The flaw in tcp_pulloutofband() can trigger an infinite loop if the out-of-band data pointer exceeds the TCP segment boundaries, potentially leading to a DoS attack on the system.
The Impact of CVE-2021-31400
Exploitation of this vulnerability can cause a continuous loop or a device reset, disrupting the normal operation of the affected device and potentially leading to service unavailability.
Technical Details of CVE-2021-31400
This section outlines the specifics of the vulnerability, including the affected systems, versions, and how it can be exploited.
Vulnerability Description
The TCP out-of-band urgent-data processing function in HCC embedded InterNiche 4.0.1 invokes a panic function when the out-of-band data pointer extends beyond the TCP segment's data, resulting in an infinite loop.
Affected Systems and Versions
The vulnerability affects the specified version of HCC embedded InterNiche 4.0.1 where the urgent-data processing function is implemented.
Exploitation Mechanism
An attacker can exploit this vulnerability by sending specially crafted TCP packets to trigger the out-of-band urgent-data processing function, causing the device to enter an infinite loop.
Mitigation and Prevention
To address CVE-2021-31400, immediate steps must be taken to mitigate the risk and prevent potential attacks.
Immediate Steps to Take
It is recommended to apply security patches provided by the vendor as soon as they are available to remediate this vulnerability and prevent potential DoS attacks.
Long-Term Security Practices
Implementing network security measures and regularly updating systems can help reduce the risk of a successful exploitation of this vulnerability.
Patching and Updates
Stay informed about security updates and patches released by HCC for InterNiche 4.0.1 to ensure your systems are protected from known vulnerabilities.