CVE-2021-28998 : Security Advisory and Response
Discover the impact and technical details of CVE-2021-28998, a file upload vulnerability in CMS Made Simple allowing remote attackers to gain a webshell. Learn how to mitigate and prevent this security risk.
A file upload vulnerability in CMS Made Simple through version 2.2.15 has been identified, allowing remote authenticated attackers to gain a webshell via a crafted phar file.
Understanding CVE-2021-28998
This section will delve into the details of CVE-2021-28998, shedding light on its implications and technical aspects.
What is CVE-2021-28998?
The CVE-2021-28998 vulnerability involves a file upload issue in CMS Made Simple version 2.2.15, permitting remote authenticated attackers to acquire a webshell by utilizing a specially crafted phar file.
The Impact of CVE-2021-28998
The vulnerability allows threat actors to gain unauthorized access to the target system, potentially leading to data theft, manipulation, or complete system compromise.
Technical Details of CVE-2021-28998
In this section, we will explore the specific technical aspects of CVE-2021-28998, including the vulnerability description, affected systems, and the exploitation mechanism.
Vulnerability Description
The vulnerability in CMS Made Simple through version 2.2.15 enables remote authenticated attackers to execute arbitrary commands and take control of the system through a malicious phar file.
Affected Systems and Versions
All versions of CMS Made Simple up to 2.2.15 are impacted by CVE-2021-28998, making them susceptible to exploitation if not promptly addressed.
Exploitation Mechanism
Attackers can leverage the file upload vulnerability by uploading a specially crafted phar file, subsequently gaining a webshell and unauthorized system access.
Mitigation and Prevention
This section provides guidance on mitigating the risks associated with CVE-2021-28998, including immediate steps to take and long-term security practices to adopt.
Immediate Steps to Take
Users are advised to update CMS Made Simple to a secure version, restrict file upload permissions, and monitor for any suspicious activities on their systems.
Long-Term Security Practices
Implementing strong access controls, conducting regular security audits, and educating users on safe file upload practices can enhance overall system security and resilience.
Patching and Updates
Regularly applying security patches and staying informed about software updates is crucial to protect systems from known vulnerabilities and emerging threats.