CVE-2021-23049 : Exploit Details and Defense Strategies
Explore the impact of CVE-2021-23049, a DoS vulnerability in BIG-IP versions 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3. Learn about mitigation steps to secure your systems.
This article provides details about CVE-2021-23049, a vulnerability found in BIG-IP versions 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3 that could lead to a denial-of-service (DoS) attack.
Understanding CVE-2021-23049
This section delves into the specifics of the CVE-2021-23049 vulnerability present in the BIG-IP software.
What is CVE-2021-23049?
The vulnerability in question affects BIG-IP versions 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3. It occurs when the iRules RESOLVER::summarize command is used on a virtual server, enabling undisclosed requests to increase Traffic Management Microkernel (TMM) memory utilization. This heightened memory consumption can result in an out-of-memory condition, triggering a DoS attack.
The Impact of CVE-2021-23049
Exploitation of this vulnerability could potentially lead to a DoS scenario, hindering the availability of affected systems by exhaustively consuming TMM memory resources.
Technical Details of CVE-2021-23049
This section provides a deeper dive into the technical aspects of CVE-2021-23049.
Vulnerability Description
The vulnerability stems from improper handling of requests by the RESOLVER::summarize command, allowing unauthorized requests to over-utilize TMM memory and exhaust system resources.
Affected Systems and Versions
The vulnerability impacts BIG-IP versions 16.0.x before 16.0.1.2 and 15.1.x before 15.1.3 specifically.
Exploitation Mechanism
By sending undisclosed requests using the RESOLVER::summarize command to a virtual server on the affected BIG-IP versions, attackers can trigger a DoS by causing excessive memory consumption.
Mitigation and Prevention
Safeguarding strategies to mitigate the risks associated with CVE-2021-23049 are crucial for maintaining system security.
Immediate Steps to Take
It is recommended to apply security patches provided by F5 as soon as possible to address the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implementing robust security measures, regular system updates, and monitoring for suspicious activities can enhance overall system security posture.
Patching and Updates
Regularly check for and apply software updates and patches released by F5 to ensure your BIG-IP systems are protected against known vulnerabilities.