CVE-2021-21372 : Vulnerability Insights and Analysis
Learn about CVE-2021-21372, a vulnerability in Nimble package manager, allowing attackers to execute arbitrary commands via specially crafted package metadata. Understand the impact and mitigation steps.
Nimble is a package manager for the Nim programming language. The vulnerability exists in Nimble release versions before 1.2.10 and 1.4.4, allowing attackers to execute arbitrary commands by manipulating the packages.json package list.
Understanding CVE-2021-21372
This CVE refers to a security flaw in Nimble, a package manager for Nim programming language, that enables threat actors to execute malicious code by exploiting package metadata.
What is CVE-2021-21372?
In vulnerable Nimble versions, attackers can abuse Nimble doCmd to run arbitrary commands. By inserting a malicious entry in the packages.json file, they can trigger unauthorized code execution.
The Impact of CVE-2021-21372
The vulnerability poses a significant risk, with a CVSS base score of 8.3 (High severity). It can lead to a complete compromise of confidentiality, integrity, and availability without requiring any special privileges.
Technical Details of CVE-2021-21372
This section delves into the specific technical aspects of the CVE.
Vulnerability Description
The flaw arises from the improper handling of package metadata. Attackers can exploit the doCmd function to execute arbitrary commands.
Affected Systems and Versions
Nimble versions prior to 1.2.10 and 1.4.4 are susceptible to this vulnerability.
Exploitation Mechanism
Threat actors can leverage specially crafted entries in the packages.json file to initiate code execution, compromising the targeted system's security.
Mitigation and Prevention
To safeguard systems from CVE-2021-21372, immediate actions and long-term security strategies are essential.
Immediate Steps to Take
It is crucial to update Nimble to versions 1.2.10 or 1.4.4 and sanitize the package.json file to remove any suspicious entries immediately.
Long-Term Security Practices
Implement robust input validation mechanisms and regularly monitor and validate package metadata to prevent similar threats in the future.
Patching and Updates
Stay informed about security advisories and promptly apply patches released by Nimble to address known vulnerabilities.