CVE-2019-9891 Explained : Impact and Mitigation
Learn about CVE-2019-9891, a vulnerability allowing privilege escalation and command execution in shell scripts. Find mitigation steps and long-term security practices.
This CVE-2019-9891 article provides insights into a privilege escalation and command execution vulnerability related to the getopt_simple function in shell scripts.
Understanding CVE-2019-9891
This CVE involves a security issue that allows privilege escalation and command execution when utilizing the getopt_simple function in shell scripts.
What is CVE-2019-9891?
The vulnerability arises when the getopt_simple function is used in a shell script, potentially leading to privilege escalation and command execution, especially when invoked through sudo.
The Impact of CVE-2019-9891
The vulnerability can be exploited to escalate privileges and execute unauthorized commands, posing a significant security risk to affected systems.
Technical Details of CVE-2019-9891
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability allows attackers to escalate privileges and execute commands by leveraging the getopt_simple function in shell scripts.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by invoking the getopt_simple function within a shell script, particularly when called through sudo.
Mitigation and Prevention
Protecting systems from CVE-2019-9891 requires immediate action and long-term security measures.
Immediate Steps to Take
- Avoid using the getopt_simple function in shell scripts, especially when invoked through sudo.
- Regularly monitor and review shell scripts for any suspicious or unauthorized commands.
Long-Term Security Practices
- Implement the principle of least privilege to restrict unnecessary access rights.
- Conduct regular security audits and penetration testing to identify and address vulnerabilities.
Patching and Updates
- Stay informed about security advisories and updates related to shell scripting vulnerabilities.
- Apply patches and updates promptly to mitigate the risk of privilege escalation and unauthorized command execution.