CVE-2019-17455 : What You Need to Know
Learn about CVE-2019-17455, a vulnerability in Libntlm through version 1.5 that allows for a stack-based buffer over-read. Find out how to mitigate and prevent exploitation.
Libntlm through version 1.5 is susceptible to a stack-based buffer over-read vulnerability due to the use of a fixed buffer size in certain operations.
Understanding CVE-2019-17455
In versions up to 1.5, Libntlm uses a constant buffer size for specific read and write operations, leading to a stack-based buffer over-read vulnerability.
What is CVE-2019-17455?
Libntlm through version 1.5 relies on a fixed buffer size for certain read and write operations, resulting in a stack-based buffer over-read vulnerability.
The Impact of CVE-2019-17455
This vulnerability can be exploited by an attacker to cause a stack-based buffer over-read in the buildSmbNtlmAuthRequest function when handling a manipulated NTLM request.
Technical Details of CVE-2019-17455
Libntlm through version 1.5 is affected by a stack-based buffer over-read vulnerability due to the use of a fixed buffer size in specific operations.
Vulnerability Description
The vulnerability arises from the fixed buffer size used in tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and tSmbNtlmAuthResponse read and write operations, allowing for a stack-based buffer over-read in buildSmbNtlmAuthRequest.
Affected Systems and Versions
- Product: n/a
- Vendor: n/a
- Versions affected: Up to 1.5
Exploitation Mechanism
The vulnerability can be exploited by manipulating NTLM requests to trigger a stack-based buffer over-read in the buildSmbNtlmAuthRequest function.
Mitigation and Prevention
It is crucial to take immediate steps to address and prevent the exploitation of CVE-2019-17455.
Immediate Steps to Take
- Apply security updates provided by the vendor promptly.
- Monitor official sources for patches and advisories.
- Implement network segmentation to limit the impact of potential attacks.
Long-Term Security Practices
- Regularly update and patch software to mitigate known vulnerabilities.
- Conduct security assessments and audits to identify and address weaknesses.
Patching and Updates
- Stay informed about security updates and patches released by the vendor.
- Apply patches as soon as they are available to protect systems from exploitation.