CVE-2019-3464 : Exploit Details and Defense Strategies
Learn about CVE-2019-3464 affecting rssh in Debian GNU/Linux. Discover the impact, affected versions, and mitigation steps for this environment variable sanitization vulnerability.
CVE-2019-3464 was published on February 6, 2019, and affects the 'rssh' product in Debian GNU/Linux. The vulnerability arises from insufficient sanitization of environment variables passed to rsync, potentially allowing unauthorized execution of shell commands.
Understanding CVE-2019-3464
This CVE highlights a security issue in the rssh product that could lead to the execution of arbitrary shell commands.
What is CVE-2019-3464?
Insufficient sanitization of environment variables passed to rsync can bypass the restrictions imposed by rssh, a restricted shell, potentially enabling the execution of unauthorized shell commands.
The Impact of CVE-2019-3464
The vulnerability could allow attackers to execute arbitrary shell commands, bypassing the intended restrictions of rssh.
Technical Details of CVE-2019-3464
This section provides more in-depth technical details about the CVE.
Vulnerability Description
By not properly sanitizing environment variables passed to rsync, attackers can bypass rssh restrictions, potentially leading to unauthorized shell command execution.
Affected Systems and Versions
- Product: rssh
- Vendor: Debian GNU/Linux
- Versions Affected: All versions before 2.3.4-5+deb9u2 and 2.3.4-10
Exploitation Mechanism
The vulnerability arises from incomplete sanitization of environment variables, allowing attackers to execute unauthorized shell commands.
Mitigation and Prevention
Protecting systems from CVE-2019-3464 requires immediate action and long-term security practices.
Immediate Steps to Take
- Update rssh to version 2.3.4-5+deb9u2 or 2.3.4-10 to mitigate the vulnerability.
- Monitor system logs for any unusual shell command executions.
Long-Term Security Practices
- Implement strict input validation mechanisms to prevent unauthorized command execution.
- Regularly update and patch all software components to address security vulnerabilities.
Patching and Updates
- Apply the latest security patches provided by Debian GNU/Linux to address CVE-2019-3464.