Microsoft Net Framework 4.0 V 30319 Vulnerabilities Direct

Similar to CVE-2020-0646, this remote code execution flaw arises when .NET Framework mishandles input processing. To exploit the vulnerability, an attacker would need to upload a specially crafted file to a vulnerable web application. It was fixed in the August 2020 Security Update.

This older, critical vulnerability affected the JIT compiler on 64-bit platforms. By sending a specially crafted .NET application, an attacker could cause memory corruption and execute arbitrary code. This flaw was patched by Microsoft in a security update released in 2011.

Before diving into vulnerabilities, it is crucial to understand what 4.0.30319 represents. This number is the and the assembly file version of the core libraries. Early versions of .NET 4.0 (RTM) had build numbers like 4.0.30319.1 (RTM) and later 4.0.30319.269 (with updates). microsoft net framework 4.0 v 30319 vulnerabilities

The string does not represent the exact version of the .NET Framework application bundle installed on a machine. Instead, it refers to the build number of the Common Language Runtime (CLR) 4.0 .

Do not rely on folder names. Check HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full to see the actual version installed. Similar to CVE-2020-0646, this remote code execution flaw

Attackers can exploit the way the runtime handles specific XML or network inputs to crash applications or hang the entire system, disrupting business operations. Why version "30319" is misleading

Attackers can exploit flaws in the ASP.NET subsystem to bypass Forms Authentication or perform session hijacking by stealing valid session cookies. This older, critical vulnerability affected the JIT compiler

Maintaining an up-to-date system is critical. Ensure that you regularly install the latest from Microsoft. These cumulative updates contain all past security fixes and are readily available via Windows Update, WSUS (Windows Server Update Services), and the Microsoft Update Catalog.

The number "v4.0.30319" is famously visible in file paths (such as C:\Windows\Microsoft.NET\Framework\v4.0.30319 ) and assembly metadata. It denotes the build number of the CLR introduced with .NET Framework 4.0. Crucially, this same CLR version was carried over and used by .NET Framework 4.5, 4.6, 4.7, and 4.8.

The following table lists some notable vulnerabilities that affected various versions of the .NET Framework 4.x family. It is crucial to understand that these flaws are not an inherent problem with the CLR version v4.0.30319 . Instead, they affected specific, older .NET Framework releases and were later patched in subsequent updates.