CVE-2020-1340 in NuGetGallery
Summary
by MITRE
A spoofing vulnerability exists when the NuGetGallery does not properly sanitize input on package metadata values, aka 'NuGetGallery Spoofing Vulnerability'.
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Analysis
by VulDB Data Team • 10/23/2020
The CVE-2020-1340 vulnerability represents a critical spoofing flaw within the NuGet Gallery platform that undermines the integrity of package metadata handling. This vulnerability specifically affects the NuGet Gallery's input sanitization mechanisms, creating a pathway for malicious actors to manipulate package metadata values. The issue arises from insufficient validation and sanitization of user-provided data during package registration and metadata submission processes, allowing attackers to inject deceptive information that can mislead developers and end users. The vulnerability impacts the entire NuGet ecosystem as it compromises the trust model that developers rely upon when selecting and integrating third-party packages into their applications. This flaw directly affects the package identifier, version information, author details, and other metadata fields that users typically trust as accurate representations of package origins and characteristics.
The technical implementation of this vulnerability stems from inadequate input validation within the NuGet Gallery's backend processing pipeline. When developers submit packages to the gallery, the system should rigorously sanitize all metadata fields to prevent injection of malicious or misleading content. However, the vulnerability demonstrates that certain characters, sequences, or formatting patterns within package metadata are not properly escaped or validated, enabling attackers to craft package names or metadata that appear legitimate but contain deceptive elements. This sanitization failure creates a condition where the gallery's display mechanisms can render misleading information to users browsing package repositories. The flaw operates at the application layer and affects the integrity of package identification and trust relationships within the NuGet package management ecosystem. According to CWE classification, this vulnerability maps to CWE-116, which addresses improper encoding or escaping of output, and CWE-79, which covers cross-site scripting vulnerabilities that can result from insufficient input sanitization. The vulnerability also aligns with ATT&CK technique T1059.001, which involves executing malicious code through command injection or manipulation of application inputs.
The operational impact of CVE-2020-1340 extends far beyond simple information disclosure, as it fundamentally undermines the security posture of developers who depend on NuGet Gallery for package management. Attackers can exploit this vulnerability to create packages that appear to be from legitimate organizations or well-known developers, potentially leading to supply chain attacks where malicious code is distributed through seemingly trustworthy sources. This spoofing capability enables social engineering attacks against developers who trust package metadata, potentially resulting in the installation of malicious packages that compromise application security. The vulnerability's impact is particularly severe because NuGet is widely used across .NET development environments, making the attack surface extensive and the potential damage significant. Organizations using NuGet packages for dependency management face elevated risk of credential theft, data exfiltration, or system compromise when they unknowingly install packages affected by this spoofing vulnerability. The vulnerability also impacts automated build systems and continuous integration pipelines that rely on NuGet package metadata for dependency resolution and security scanning. The compromised trust model affects not only individual developers but also enterprise security policies that depend on the integrity of package repositories for maintaining secure software supply chains.
Mitigation strategies for CVE-2020-1340 require both immediate remediation and long-term architectural improvements to strengthen input validation and sanitization processes. Organizations should immediately update to patched versions of NuGet Gallery that implement proper input sanitization and validation mechanisms, ensuring that all metadata fields are rigorously checked for malicious content patterns. The implementation should include comprehensive character encoding, regular expression validation, and strict sanitization of package identifiers, author information, and version strings to prevent injection of deceptive metadata. Security teams should also implement additional monitoring and alerting for suspicious package submissions, particularly those containing unusual character sequences or attempts to mimic well-known package names. Organizations should consider implementing package signature verification mechanisms and maintain updated security policies that address the risks of dependency confusion attacks. The vulnerability highlights the importance of defense-in-depth strategies, including regular security audits of package repositories, implementation of automated scanning tools for suspicious package metadata, and establishment of secure software supply chain practices. System administrators should also configure access controls to limit package submission privileges and implement multi-factor authentication for package management accounts to reduce the attack surface. Additionally, developers should be trained to recognize potential spoofing indicators in package metadata and maintain awareness of the risks associated with third-party package dependencies in their development environments.