CVE-2021-38623 : Security Advisory and Response
Learn about CVE-2021-38623, a Denial of Service vulnerability in the deferred_image_processing extension before version 1.0.2 for TYPO3, allowing attackers to exhaust disk space.
This article provides an in-depth look at CVE-2021-38623, a vulnerability found in the deferred_image_processing extension for TYPO3.
Understanding CVE-2021-38623
CVE-2021-38623 is a Denial of Service vulnerability in the deferred_image_processing extension before version 1.0.2 for TYPO3.
What is CVE-2021-38623?
The vulnerability in the extension allows for Denial of Service via the File Abstraction Layer (FAL) API due to excessive disk consumption in the /var/transient directory.
The Impact of CVE-2021-38623
This vulnerability can be exploited by malicious actors to exhaust disk space on the affected system, leading to service unavailability and system crashes.
Technical Details of CVE-2021-38623
The following technical details outline the specifics of CVE-2021-38623:
Vulnerability Description
The deferred_image_processing extension before 1.0.2 for TYPO3 is susceptible to a Denial of Service attack through disk space consumption in the /var/transient directory.
Affected Systems and Versions
All versions of the deferred_image_processing extension before 1.0.2 for TYPO3 are impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending a significant amount of requests using the FAL API, causing the /var/transient directory to consume excessive disk space.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-38623, consider the following steps:
Immediate Steps to Take
- Disable the deferred_image_processing extension if not required immediately.
- Monitor disk space usage closely to identify any sudden spikes.
- Implement access controls to restrict API usage for the extension.
Long-Term Security Practices
- Regularly update TYPO3 extensions to their latest versions.
- Implement proper disk space management practices.
- Conduct regular security audits to identify and address vulnerabilities.
Patching and Updates
Apply the official patch provided by TYPO3 to address the CVE-2021-38623 vulnerability.