CVE-2014-4122 in .NET Framework
Summary
by MITRE
Microsoft .NET Framework 2.0 SP2, 3.5, and 3.5.1 omits the ASLR protection mechanism, which allows remote attackers to obtain potentially sensitive information about memory addresses by leveraging the predictability of an executable image's location, aka ".NET ASLR Vulnerability."
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Analysis
by VulDB Data Team • 02/22/2022
The CVE-2014-4122 vulnerability represents a critical security flaw in Microsoft .NET Framework versions 2.0 SP2, 3.5, and 3.5.1 that fundamentally undermines address space layout randomization protections. This vulnerability falls under the CWE-16 category of "Configuration' and specifically targets memory protection mechanisms that are essential for modern application security. The flaw manifests when the .NET Framework fails to properly implement ASLR (Address Space Layout Randomization) across executable images, creating predictable memory address patterns that attackers can exploit to gain insights into system memory layouts.
The technical implementation of this vulnerability stems from the absence of proper ASLR enforcement within the .NET Framework runtime environment. When applications execute within the .NET Framework, they rely on predictable memory layouts for proper operation, but the missing ASLR protection means that attackers can determine the base addresses of executable images, loaded libraries, and other memory segments. This predictability enables sophisticated exploitation techniques that would otherwise be impossible in properly protected environments. The vulnerability is particularly concerning because it affects multiple versions of the framework, creating widespread exposure across numerous enterprise systems and applications that depend on .NET for operation.
From an operational impact perspective, this vulnerability significantly increases the attack surface for remote adversaries who can leverage the predictable memory addresses to bypass other security mechanisms such as DEP (Data Execution Prevention) and stack canaries. The ability to obtain sensitive information about memory addresses provides attackers with crucial data needed to plan more sophisticated attacks, including buffer overflow exploitation, return-oriented programming attacks, and other advanced persistent threats. This vulnerability directly maps to ATT&CK technique T1059.001 for command and script interpreter usage, as attackers can use the predictable memory layout information to craft more effective payloads. The impact extends beyond simple information disclosure, as it fundamentally weakens the security posture of systems running affected .NET Framework versions.
Mitigation strategies for CVE-2014-4122 primarily involve applying the appropriate Microsoft security updates and patches that restore proper ASLR functionality to the affected .NET Framework versions. Organizations should prioritize immediate patch deployment across all systems running vulnerable .NET Framework versions, particularly those exposed to external networks or handling sensitive data. Additional mitigations include implementing network segmentation to limit exposure, monitoring for suspicious network traffic patterns that might indicate exploitation attempts, and conducting comprehensive vulnerability assessments to identify systems running affected framework versions. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how seemingly minor configuration issues can create significant security risks in enterprise environments. System administrators should also consider implementing additional security controls such as application whitelisting and enhanced intrusion detection systems to provide defense-in-depth against potential exploitation attempts.