CVE-2017-18190 : What You Need to Know
Learn about CVE-2017-18190, a critical vulnerability in CUPS software before version 2.2.2 allowing remote attackers to execute arbitrary IPP commands. Find mitigation steps and preventive measures here.
CUPS software before version 2.2.2 is vulnerable to a remote code execution exploit through the valid_host() function in client.c. Attackers can run arbitrary IPP commands by exploiting a whitelist entry for localhost.localdomain.
Understanding CVE-2017-18190
This CVE entry highlights a critical vulnerability in the CUPS software that allows remote attackers to execute arbitrary IPP commands.
What is CVE-2017-18190?
The function valid_host() in the CUPS software before version 2.2.2 contains a whitelist entry for localhost.localdomain, which can be exploited by remote attackers to run arbitrary IPP commands by sending POST requests to the CUPS daemon along with DNS rebinding.
The Impact of CVE-2017-18190
The vulnerability allows attackers to execute arbitrary IPP commands, posing a significant risk of remote code execution on affected systems.
Technical Details of CVE-2017-18190
This section delves into the technical aspects of the CVE.
Vulnerability Description
A whitelist entry for localhost.localdomain in valid_host() in CUPS before version 2.2.2 enables remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in conjunction with DNS rebinding.
Affected Systems and Versions
- Product: CUPS
- Vendor: N/A
- Versions affected: Before 2.2.2
Exploitation Mechanism
Attackers exploit the whitelist entry for localhost.localdomain in the valid_host() function by sending POST requests to the CUPS daemon along with DNS rebinding.
Mitigation and Prevention
Protecting systems from CVE-2017-18190 requires immediate action and long-term security practices.
Immediate Steps to Take
- Update CUPS software to version 2.2.2 or newer to mitigate the vulnerability.
- Monitor network traffic for any suspicious activity related to IPP commands.
Long-Term Security Practices
- Implement network segmentation to limit exposure to critical systems.
- Regularly update and patch software to address security vulnerabilities.
Patching and Updates
- Apply security patches provided by CUPS to address the vulnerability.