CVE-2021-1229 : Exploit Details and Defense Strategies
Discover the impact of CVE-2021-1229, a Cisco NX-OS Software vulnerability enabling remote attackers to cause a memory leak that leads to a denial of service (DoS) condition. Learn how to mitigate the risk.
A vulnerability in ICMP Version 6 (ICMPv6) processing in Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a slow system memory leak, potentially leading to a denial of service (DoS) condition. This flaw results from improper error handling when a specific type of ICMPv6 packet is received by an IPv6-configured interface. Attackers can exploit this by sending crafted ICMPv6 packets, causing a system memory leak and disrupting traffic processing.
Understanding CVE-2021-1229
This CVE entry addresses a security vulnerability in Cisco NX-OS Software that could be exploited by remote attackers to trigger system memory leaks.
What is CVE-2021-1229?
CVE-2021-1229 highlights a flaw in ICMPv6 processing in Cisco NX-OS Software that enables attackers to disrupt device functionality by causing a memory leak.
The Impact of CVE-2021-1229
The vulnerability can result in a denial of service (DoS) condition by depleting system memory, leading to traffic instability and the need for a device reboot to restore functionality.
Technical Details of CVE-2021-1229
This section provides insights into the vulnerability's technical aspects, affected systems, and the exploitation mechanism.
Vulnerability Description
The vulnerability stems from errors in handling specific ICMPv6 packets, allowing attackers to exploit this flaw to initiate a slow system memory leak.
Affected Systems and Versions
Cisco NX-OS Software is affected by this vulnerability, potentially impacting the system's ICMPv6 processing capabilities.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending crafted ICMPv6 packets to a local IPv6 address, causing a sustained system memory leak that disrupts processing.
Mitigation and Prevention
To address CVE-2021-1229, consider the following steps for mitigation and prevention.
Immediate Steps to Take
- Monitor network traffic for any signs of suspicious activity related to ICMPv6 packets.
- Apply vendor patches or updates as soon as they are available.
Long-Term Security Practices
- Regularly update and patch all systems running Cisco NX-OS Software to prevent known vulnerabilities.
- Implement network segmentation to minimize the impact of potential attacks.
Patching and Updates
Stay informed about security advisories from Cisco and promptly apply patches to secure your systems.