CVE-2020-7725 in worksmith Package
Summary
by MITRE
All versions of package worksmith are vulnerable to Prototype Pollution via the setValue function.
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Analysis
by VulDB Data Team • 11/12/2020
The vulnerability identified as CVE-2020-7725 affects the worksmith package, which is a JavaScript library used for creating and managing workflow processes. This particular flaw represents a prototype pollution vulnerability that has significant implications for applications relying on this package. The vulnerability specifically manifests through the setValue function, which is a core component of the library's functionality for setting values within objects and prototypes. Prototype pollution occurs when an attacker can manipulate the prototype of an object, potentially allowing them to inject malicious code or alter the behavior of the application at runtime.
The technical nature of this vulnerability stems from improper input validation within the setValue function implementation. When the function processes user-supplied data or external inputs, it fails to adequately sanitize or validate the keys being used to set values on objects. This allows an attacker to inject properties into the Object.prototype, which can then be inherited by all objects in the application. The flaw exists because the code does not properly check whether the provided keys are safe to use when modifying object prototypes, creating a pathway for attackers to pollute the prototype chain with malicious properties.
The operational impact of this vulnerability extends beyond simple code injection, as it can enable attackers to manipulate the behavior of applications that depend on the worksmith package. When prototype pollution occurs, it can lead to various downstream effects including denial of service conditions, where legitimate application functionality is disrupted. Additionally, the vulnerability can be leveraged to perform more sophisticated attacks such as remote code execution in certain contexts, especially when the application uses features like eval or JSON.parse in ways that make the polluted prototype accessible. The vulnerability also increases the attack surface for applications that may be using the worksmith package in conjunction with other libraries or frameworks that are vulnerable to prototype pollution attacks.
Organizations using the worksmith package should prioritize immediate remediation by upgrading to a patched version that properly validates and sanitizes input before modifying object prototypes. The vulnerability aligns with CWE-471, which specifically addresses the issue of incorrect handling of prototype pollution in programming languages. From an ATT&CK framework perspective, this vulnerability maps to techniques involving prototype pollution and can be used to establish persistence or escalate privileges within affected applications. Security teams should also implement monitoring for unusual object property modifications and consider implementing strict Content Security Policies to limit the impact of potential exploitation. The remediation process should include thorough code reviews of all applications that depend on the worksmith package, ensuring that no other libraries or code paths are susceptible to similar prototype pollution issues.