Name: Ruby Kernel#open/URI.open Remote Code Execution (RCE) Scanner
This scanner detects the use of Ruby Kernel#open/URI.open for potential Remote Code Execution (RCE) in digital assets. It ensures that your systems are safeguarded against unauthorized process invocations that may result from variable input in the argument of these methods. Keep your Ruby applications secure by identifying these vulnerabilities.
Short Info
Level
Single Scan
Single Scan
Can be used by
Asset Owner
Estimated Time
10 seconds
Time Interval
23 days 23 hours
Scan only one
URL
Toolbox
Ruby is a dynamic, open-source programming language with a focus on simplicity and productivity. It is widely used by developers for building web applications, data processing, and automation tasks. Ruby's flexibility and extensive libraries make it popular among startups and tech companies. Developers often utilize Ruby on Rails, a web application framework, to streamline the process of building complex applications. Many organizations, including Airbnb, GitHub, and Shopify, rely on Ruby for various software development needs. Ensuring the integrity and security of Ruby applications is crucial for maintaining operational continuity and protecting sensitive data.
The Remote Code Execution (RCE) vulnerability associated with Ruby's Kernel#open and URI.open methods poses a significant security risk. These methods allow not only file access but also process invocation with the use of a pipe symbol. When untrusted input is used in these methods, it can lead to arbitrary command execution on the server. This vulnerability can be exploited by attackers to execute harmful commands, potentially compromising server integrity. The risk escalates when variable input is not properly sanitized, allowing malicious commands to be executed in the Ruby runtime environment.
From a technical perspective, the vulnerability lies in the handling of inputs to the Kernel#open and URI.open methods. By prefixing a command with a pipe symbol, Ruby interprets it as a shell command and executes it. This is particularly dangerous when the input is sourced from user-controlled parameters, such as HTTP query parameters or other dynamic sources. The vulnerable endpoints and parameters depend on how and where these methods are used within an application. The severity of the vulnerability necessitates rigorous input validation and sanitization to prevent potential exploits.
The possible effects of exploiting this RCE vulnerability are severe. An attacker could gain unauthorized access to sensitive data, manipulate system configurations, or install malicious software, leading to data breaches and potential system downtime. Such exploits could result in loss of trust, financial loss, and damage to an organization's reputation. The vulnerability can also be used as a gateway to further infiltrate connected systems, expanding the scope of an attack. Ensuring thorough code review and adopting secure coding practices are essential to mitigate these risks.
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