CVE-2019-0191 Explained : Impact and Mitigation
Learn about CVE-2019-0191 affecting Apache Karaf versions prior to 4.2.3. Understand the Zip-slip vulnerability allowing attackers to write unauthorized content to the filesystem.
CVE-2019-0191 was published on March 20, 2019, and affects Apache Karaf versions prior to 4.2.3. The vulnerability, known as Zip-slip, allows attackers to write unauthorized content to the filesystem by exploiting the Kar deployer's lack of path validation in .kar archives.
Understanding CVE-2019-0191
Apache Karaf's Kar deployer vulnerability allows malicious users to escape designated directories and potentially write unauthorized content to the filesystem.
What is CVE-2019-0191?
The Zip-slip vulnerability in Apache Karaf's Kar deployer arises from the lack of path validation in .kar archives, enabling attackers to write unauthorized content to the filesystem.
The Impact of CVE-2019-0191
The vulnerability poses a risk of unauthorized content being written to the filesystem by exploiting the lack of path validation in .kar archives.
Technical Details of CVE-2019-0191
The technical aspects of the vulnerability in Apache Karaf.
Vulnerability Description
The Kar deployer in Apache Karaf writes content from .kar archives to directories without validating paths, allowing attackers to write unauthorized content.
Affected Systems and Versions
- Product: Apache Karaf
- Vendor: Apache
- Versions Affected: Apache Karaf version prior to 4.2.3
Exploitation Mechanism
Attackers can create .kar files with directory names ".." to escape designated directories and write unauthorized content to the filesystem.
Mitigation and Prevention
Steps to mitigate and prevent exploitation of CVE-2019-0191.
Immediate Steps to Take
- Upgrade Apache Karaf to version 4.2.3 or later to mitigate the Zip-slip vulnerability.
- Restrict permissions for the Karaf process user on the filesystem.
Long-Term Security Practices
- Regularly update Apache Karaf to the latest version to patch known vulnerabilities.
- Implement strict file system permissions to prevent unauthorized writes.
- Educate users on safe handling of archive files to avoid exploitation.
Patching and Updates
Ensure timely patching and updates for Apache Karaf to address security vulnerabilities.