CVE-2018-1083 : Security Advisory and Response
Learn about the buffer overflow vulnerability in Zsh before version 5.4.2-test-1, allowing local unprivileged users to execute arbitrary code and potentially escalate privileges. Find mitigation steps and long-term security practices here.
A vulnerability has been identified in Zsh prior to version 5.4.2-test-1 that involves a buffer overflow in the autocomplete feature of the shell. An attacker with local, non-privileged access can exploit this vulnerability by creating a manipulated directory path, leading to the execution of arbitrary code within the user's context and potential privilege escalation.
Understanding CVE-2018-1083
Zsh before version 5.4.2-test-1 is vulnerable to a buffer overflow in the shell autocomplete functionality.
What is CVE-2018-1083?
- Zsh prior to version 5.4.2-test-1 has a buffer overflow vulnerability in its autocomplete feature.
- Attackers with local, non-privileged access can execute arbitrary code by manipulating directory paths.
- Privileged users affected by this vulnerability are at risk of privilege escalation.
The Impact of CVE-2018-1083
- Local unprivileged users can exploit the vulnerability to execute code in the user's context.
- Privileged users are susceptible to privilege escalation through this vulnerability.
Technical Details of CVE-2018-1083
Zsh before version 5.4.2-test-1 is susceptible to a buffer overflow in the autocomplete feature.
Vulnerability Description
- A buffer overflow vulnerability exists in the autocomplete functionality of Zsh.
Affected Systems and Versions
- Product: Zsh
- Vendor: Zsh
- Versions Affected: Before Zsh 5.4.2-test-1
Exploitation Mechanism
- Attackers create a specially crafted directory path to trigger code execution within the user's context.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent the exploitation of CVE-2018-1083.
Immediate Steps to Take
- Update Zsh to version 5.4.2-test-1 or later to mitigate the vulnerability.
- Monitor and restrict access to potentially vulnerable systems.
Long-Term Security Practices
- Regularly update software and apply security patches to prevent known vulnerabilities.
- Implement the principle of least privilege to limit the impact of potential exploits.
Patching and Updates
- Stay informed about security advisories and updates from Zsh and relevant vendors to apply patches promptly.