CVE-2024-29059 Microsoft .NET Framework Information Disclosure Vulnerability

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CVE-2024-29059 is a critical information disclosure vulnerability identified in Microsoft’s .NET Framework. This vulnerability arises from improper handling of HTTP .NET Remoting requests, leading to the unintended exposure of sensitive information.

Vulnerable Systems

The following versions of the .NET Framework are affected:

  • .NET Framework 2.0 SP2
  • .NET Framework 3.0 SP2
  • .NET Framework 3.5
  • .NET Framework 3.5.1
  • .NET Framework 4.6
  • .NET Framework 4.6.2
  • .NET Framework 4.7
  • .NET Framework 4.7.1
  • .NET Framework 4.7.2
  • .NET Framework 4.8
  • .NET Framework 4.8.1

These versions are commonly deployed across various Windows operating systems, including Windows Server 2008, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows 10, and Windows 11.

Technical Details

The vulnerability is rooted in the .NET Framework’s handling of HTTP .NET Remoting, particularly in the exposure of ObjRef URIs. An ObjRef is a serializable representation of a remote object used in .NET Remoting to facilitate communication between application domains. Due to improper handling, attackers can leak ObjRef instances via HTTP requests to endpoints like /RemoteApplicationMetadata.rem. By exploiting this flaw, an attacker can deserialize malicious objects, potentially leading to remote code execution.

Proof of Concept

Security researchers have developed proof-of-concept (PoC) exploits demonstrating how this vulnerability can be leveraged. For instance, by sending crafted HTTP requests to the vulnerable endpoint, attackers can retrieve ObjRef data and use it to execute arbitrary code on the affected system. Detailed technical information and PoC scripts are available in public repositories.

Impact of Successful Exploitation

If exploited, this vulnerability can lead to unauthorized information disclosure, potentially exposing sensitive data to attackers. Moreover, the exposure of ObjRef URIs can be a precursor to remote code execution attacks, allowing attackers to execute arbitrary code within the context of the affected application. The Common Vulnerability Scoring System (CVSS) has assigned this vulnerability a base score of 7.5, indicating a high severity level.

Mitigation and Remediation

To address CVE-2024-29059, consider the following steps:

  1. Apply Security Updates: Microsoft has released security updates to address this vulnerability. It is imperative to apply these patches promptly.

  2. Disable HTTP .NET Remoting: If not required, consider disabling HTTP .NET Remoting to reduce the attack surface.

  3. Restrict Network Access: Implement network segmentation and access controls to limit exposure to potential attackers.

  4. Monitor and Log Activity: Regularly monitor and analyze logs for any suspicious activity related to .NET Remoting endpoints.

  5. Educate and Train Staff: Ensure that development and IT teams are aware of secure coding practices and the risks associated with deserialization vulnerabilities.

By diligently applying updates and following these mitigation strategies, organizations can significantly reduce the risk posed by CVE-2024-29059. Regular security assessments and staying informed about the latest security advisories are essential components of a robust cybersecurity posture.


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