CVE-2019-13917 : Vulnerability Insights and Analysis
Learn about CVE-2019-13917 affecting Exim versions 4.85 to 4.92, allowing remote code execution with root privileges. Find mitigation steps and update recommendations here.
Exim versions 4.85 to 4.92 are susceptible to a security vulnerability allowing remote code execution with root privileges. Learn about the impact, technical details, and mitigation steps.
Understanding CVE-2019-13917
Exim, a popular mail transfer agent, had a vulnerability in versions 4.85 to 4.92 that could lead to remote code execution under specific configurations. The issue was addressed in version 4.92.1.
What is CVE-2019-13917?
Exim versions 4.85 through 4.92 had a flaw that could be exploited by an unauthorized individual to execute code remotely with root privileges. This vulnerability stemmed from the use of the ${sort } expansion on elements like $local_part or $domain.
The Impact of CVE-2019-13917
The vulnerability in Exim could allow an attacker to execute code remotely with root privileges, posing a significant security risk to affected systems.
Technical Details of CVE-2019-13917
Examine the specifics of the vulnerability to understand its implications and how to address it effectively.
Vulnerability Description
Exim versions 4.85 to 4.92 were susceptible to remote code execution due to improper handling of certain expansions, enabling attackers to gain root access.
Affected Systems and Versions
- Vulnerable Versions: 4.85 to 4.92
- Patched Version: 4.92.1
Exploitation Mechanism
The vulnerability could be exploited by manipulating elements like $local_part or $domain using the ${sort } expansion, allowing unauthorized individuals to execute code remotely.
Mitigation and Prevention
Discover the steps to mitigate the CVE-2019-13917 vulnerability and enhance the security of Exim installations.
Immediate Steps to Take
- Update Exim to version 4.92.1 to eliminate the vulnerability.
- Review and restrict access to configurations that use the ${sort } expansion.
- Monitor system logs for any suspicious activities.
Long-Term Security Practices
- Regularly update Exim and other software to patch security vulnerabilities.
- Implement access controls and least privilege principles to limit potential attack surfaces.
Patching and Updates
- Stay informed about security advisories and promptly apply patches to secure Exim installations.