CVE-2021-29377 : Vulnerability Insights and Analysis
Learn about CVE-2021-29377, an arbitrary file upload vulnerability in Pear Admin Think through 2.1.2 that allows remote code execution. Understand the impact, technical details, and mitigation steps.
CVE-2021-29377, also known as Pear Admin Think through 2.1.2 arbitrary file upload vulnerability, enables attackers to remotely execute arbitrary code through an uploaded .php file. The vulnerability arises due to mishandling of file extensions in app/common/service/UploadService.php.
Understanding CVE-2021-29377
This section will provide insights into the nature and impact of the CVE-2021-29377 vulnerability.
What is CVE-2021-29377?
Pear Admin Think through 2.1.2 is affected by an arbitrary file upload vulnerability that can be exploited by malicious actors to run arbitrary code on the target system remotely. The flaw originates from the incorrect processing of file extensions in the UploadService.php file.
The Impact of CVE-2021-29377
The impact of this vulnerability is severe as it allows threat actors to upload malicious .php files via admin.php/index/upload and execute arbitrary commands, potentially leading to complete system compromise.
Technical Details of CVE-2021-29377
In this section, the technical aspects of the CVE-2021-29377 vulnerability will be discussed.
Vulnerability Description
The arbitrary file upload vulnerability in Pear Admin Think through 2.1.2 arises from the mishandling of file extensions in the UploadService.php file, enabling remote execution of arbitrary code via uploaded .php files.
Affected Systems and Versions
The specific affected versions of Pear Admin Think through 2.1.2 have not been detailed, but any system running this version is potentially at risk of exploitation.
Exploitation Mechanism
Exploiting this vulnerability involves uploading a malicious .php file through the designated admin.php/index/upload endpoint, taking advantage of the inadequate file extension validation in the UploadService.php file.
Mitigation and Prevention
This section will outline the steps to mitigate and prevent the exploitation of CVE-2021-29377.
Immediate Steps to Take
To mitigate the risk associated with CVE-2021-29377, users are advised to restrict file upload capabilities, sanitize file inputs, and implement proper file extension validation mechanisms.
Long-Term Security Practices
Maintaining up-to-date software versions, implementing secure coding practices, and conducting regular security audits can help prevent similar vulnerabilities in the long term.
Patching and Updates
It is crucial to patch the affected version of Pear Admin Think through to address the arbitrary file upload vulnerability. Regularly update software and apply security patches to stay protected against known vulnerabilities.