CVE-2018-20102 : Vulnerability Insights and Analysis
Learn about CVE-2018-20102, a vulnerability in HAProxy versions up to 1.8.14 allowing remote attackers to read data from an uninitialized buffer, potentially leading to unauthorized access. Find mitigation steps and preventive measures.
A vulnerability in dns_validate_dns_response function in dns.c has been found in HAProxy versions up to 1.8.14. The issue allows remote attackers to potentially read data from an uninitialized buffer, leading to unauthorized access.
Understanding CVE-2018-20102
This CVE involves a security vulnerability in HAProxy versions up to 1.8.14 that could be exploited by remote attackers.
What is CVE-2018-20102?
CVE-2018-20102 is an out-of-bounds read vulnerability in the dns_validate_dns_response function in dns.c in HAProxy versions up to 1.8.14. It arises from a lack of validation check for DNS responses, enabling attackers to access data from the buffer.
The Impact of CVE-2018-20102
The vulnerability could allow remote attackers to read 16-byte data associated with an AAAA record from the uninitialized section of the buffer. This could potentially grant unauthorized access to sensitive information on the stack or even extend beyond the buffer's limits.
Technical Details of CVE-2018-20102
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
The vulnerability in dns_validate_dns_response in HAProxy versions up to 1.8.14 allows remote attackers to read data from an uninitialized buffer, potentially leading to unauthorized access.
Affected Systems and Versions
- Product: HAProxy
- Vendor: N/A
- Versions affected: Up to 1.8.14
Exploitation Mechanism
The issue stems from the absence of a validation check for DNS responses, enabling remote attackers to read data from the buffer, potentially accessing sensitive information.
Mitigation and Prevention
Protecting systems from CVE-2018-20102 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update HAProxy to a version beyond 1.8.14 to mitigate the vulnerability.
- Monitor for any unusual network activity that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Regularly update and patch software to address known vulnerabilities.
- Implement network segmentation and access controls to limit the impact of potential attacks.
Patching and Updates
- Apply security patches provided by HAProxy to fix the vulnerability and enhance system security.