CVE-2019-0537 in Visual Studio
Summary
by MITRE
An information disclosure vulnerability exists when Visual Studio improperly discloses arbitrary file contents if the victim opens a malicious .vscontent file, aka "Microsoft Visual Studio Information Disclosure Vulnerability." This affects Microsoft Visual Studio.
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Analysis
by VulDB Data Team • 06/23/2023
The vulnerability CVE-2019-0537 represents a critical information disclosure flaw within Microsoft Visual Studio development environment that stems from improper handling of maliciously crafted .vscontent files. This vulnerability falls under the CWE-200 category of "Information Exposure" and specifically manifests when the Visual Studio IDE processes content files that contain crafted references to arbitrary system files. The attack vector exploits the trust model inherent in Visual Studio's content management system, where legitimate .vscontent files are designed to facilitate content sharing and project templates but can be manipulated to reveal sensitive system information.
The technical implementation of this vulnerability occurs through Visual Studio's content parsing mechanism that fails to properly validate file paths and access controls when processing .vscontent files. When a victim opens a maliciously constructed file, the IDE attempts to resolve file references within the content package and inadvertently exposes file contents from locations outside the intended scope. This flaw particularly affects the way Visual Studio handles relative and absolute file paths, allowing attackers to craft content files that reference system directories, configuration files, or other sensitive resources that should remain protected from unauthorized access. The vulnerability is particularly dangerous because it leverages user interaction through the opening of what appears to be a legitimate content file, making it difficult to detect and prevent through traditional security measures.
The operational impact of CVE-2019-0537 extends beyond simple information disclosure, as the vulnerability can potentially expose sensitive data including configuration files, source code fragments, or system artifacts that could aid in subsequent attacks. Attackers can craft .vscontent files that reference files in common system locations such as application directories, user profile folders, or even system configuration files that contain credentials or other sensitive information. This information exposure can facilitate privilege escalation attacks, lateral movement within network environments, or provide attackers with detailed knowledge of the target system's configuration and structure. The vulnerability affects multiple versions of Microsoft Visual Studio and can be exploited in both corporate and development environments where Visual Studio is commonly used for software development and testing.
Mitigation strategies for this vulnerability should focus on both immediate defensive measures and long-term architectural improvements to prevent similar issues in the future. Organizations should implement strict content file validation policies that restrict the types of files that can be processed within Visual Studio environments, particularly in shared or untrusted development environments. The recommended approach includes disabling automatic content file processing, implementing sandboxed environments for content file handling, and establishing strict file access controls that prevent Visual Studio from accessing sensitive system directories. Additionally, this vulnerability highlights the importance of implementing proper input validation and access control mechanisms as outlined in the MITRE ATT&CK framework's techniques for privilege escalation and credential access. Security teams should also consider implementing network-based protections that monitor for suspicious file access patterns and establish clear policies for handling external content files in development environments.