CVE-2011-1271 | Microsoft .NET Framework - JIT Compiler Operational Intel

Executive Risk Summary

"The JIT compiler in Microsoft .NET Framework 3.5 Gold and SP1, 3.5.1, and 4.0 has a vulnerability that allows context-dependent attackers to bypass intended access restrictions and execute arbitrary code. This can be achieved by leveraging a crafted application, such as a XAML browser application, an ASP.NET application, or a .NET Framework application."

Anticipated Attack Path

1. Initial Exploitation: Attacker crafts a malicious .NET application
2. Privilege Escalation: Attacker bypasses access restrictions using the JIT compiler vulnerability
3. Lateral Movement: Attacker executes arbitrary code to gain further access to the system

Am I Vulnerable?

Verify .NET Framework version and patch level
Monitor system logs for suspicious activity
Implement additional security controls, such as input validation and secure coding practices

Operational Audit Arsenal

Target Type Process

Target Asset clr.dll

Standard Path C:\Windows\Microsoft.NET\Framework\v4.0.30319

PowerShell

# 🛠️ Senior Engineer Universal Audit
# Target: clr.dll (Process)
$Targets = 'clr.dll'
$SearchPaths = @("$env:windir\System32", "$env:ProgramFiles", "${env:ProgramFiles(x86)}")

Get-ChildItem -Path $SearchPaths -Include $Targets -Recurse -ErrorAction SilentlyContinue | 
Select-Object FullName, @{Name="Version";Expression={$_.VersionInfo.ProductVersion}}