CVE-2017-0247 : Vulnerability Insights and Analysis
Learn about CVE-2017-0247, a security flaw in ASP.NET Core allowing denial of service attacks by manipulating character length calculations. Find mitigation steps and affected versions here.
A security flaw in ASP.NET Core allows for a denial of service attack by manipulating character length calculations within the Unicode Non-Character range.
Understanding CVE-2017-0247
What is CVE-2017-0247?
A vulnerability in ASP.NET Core enables malicious actors to exploit a flaw in the TextEncoder.EncodeCore function, potentially leading to denial of service attacks.
The Impact of CVE-2017-0247
The vulnerability allows remote attackers to cause denial of service by manipulating character length calculations within the Unicode Non-Character range.
Technical Details of CVE-2017-0247
Vulnerability Description
The flaw in ASP.NET Core fails to validate web requests properly, specifically in the TextEncoder.EncodeCore function, allowing for potential denial of service attacks.
Affected Systems and Versions
- Versions of ASP.NET Core Mvc prior to 1.0.4
- ASP.NET Core 1.1.x before 1.1.3
Exploitation Mechanism
Malicious individuals can exploit the vulnerability by manipulating character length calculations within the Unicode Non-Character range.
Mitigation and Prevention
Immediate Steps to Take
- Apply the necessary patches provided by Microsoft promptly.
- Monitor security advisories for any updates or additional mitigation steps.
Long-Term Security Practices
- Regularly update ASP.NET Core to the latest version to ensure security patches are in place.
- Implement secure coding practices to prevent similar vulnerabilities.
Patching and Updates
Ensure that all systems running ASP.NET Core are updated to versions 1.0.4 or 1.1.3 to mitigate the vulnerability.