CVE-2021-39235 : What You Need to Know
Learn about CVE-2021-39235, a security flaw in Apache Ozone allowing unauthorized write operations. Find mitigation steps and system impacts here.
Apache Ozone before 1.2.0 allows authenticated users with valid READ block token to perform unauthorized write operations on the same block.
Understanding CVE-2021-39235
In this CVE, a vulnerability in Apache Ozone enables users to bypass access mode restrictions, leading to potential unauthorized write actions.
What is CVE-2021-39235?
Apache Ozone before version 1.2.0 lacks proper validation on the access mode parameter of block tokens, enabling authenticated users to execute unauthorized write operations.
The Impact of CVE-2021-39235
The vulnerability in Apache Ozone prior to version 1.2.0 allows authenticated users to manipulate block tokens, potentially leading to unauthorized modifications.
Technical Details of CVE-2021-39235
Apache Ozone's vulnerability in detail:
Vulnerability Description
The issue stems from Ozone Datanode not validating the access mode parameter of block tokens, enabling authenticated users to write to blocks they should only be able to read.
Affected Systems and Versions
- Product: Apache Ozone
- Vendor: Apache Software Foundation
- Versions Affected: 1.0 (custom)
Exploitation Mechanism
Unauthorized write actions are conducted by authenticated users with valid READ block tokens due to the lack of access mode validation in Apache Ozone.
Mitigation and Prevention
To address CVE-2021-39235, follow these steps:
Immediate Steps to Take
- Upgrade to Apache Ozone release version 1.2.0 to mitigate the vulnerability.
Long-Term Security Practices
- Regularly monitor and audit permissions and access control mechanisms.
- Educate users on secure data handling practices to prevent unauthorized actions.
Patching and Updates
Ensure timely installation of software updates and patches to protect against known vulnerabilities.