Zero-day vulnerability in Microsoft .NET Framework

Denial of service
CVE-2009-1536

Vulnerability details

Advisory: SB2009081102 - Denial of service in Microsoft .NET Framework

Vulnerable component: Microsoft .NET Framework

CVE-ID: CVE-2009-1536

CVSSv3 score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:F/RL:O/RC:C

CWE-ID: CWE-20 - Improper input validation

Description:

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to incorrect managing of request scheduling by ASP.NET. By sending multiple HTTP requests, a remote attacker can trigger the Web server to crash.

Successful exploitation of the vulnerability results in denial of service on the vulnerable system.

Note: the vulnerability was being actively exploited.

External links:

https://technet.microsoft.com/en-us/library/security/ms09-036.aspx

About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.