CVE 2019 5418

Overview

CVE-2019-5418 presents a significant vulnerability within Ruby on Rails’ Action View component, highlighting a file content disclosure issue that could potentially escalate into remote code execution. This vulnerability occurs when specially crafted accept headers are utilized in conjunction with certain calls to render files. As a result, arbitrary files on the server can be rendered and their contents disclosed, posing a risk to the integrity and confidentiality of server data.

The implications of this vulnerability primarily affect applications relying on the render method without a specified accept format. This allows attackers to exploit the oversight, leading to unauthorized access to sensitive information stored in server files. Developers utilizing Rails should be aware of this vulnerability and ensure their applications are updated to mitigate risks associated with it.

Features

• File Content Disclosure: Enables attackers to gain access to arbitrary file contents on the server due to malformed accept headers.

• Possible Remote Code Execution: Given its nature, this vulnerability may lead to more severe exploits, allowing attackers to execute arbitrary code remotely.

• Affected Controller Code: Vulnerable code manifests easily, making it critical for developers to review their controller implementations.

• Rapid Disclosure Risk: The vulnerability can be exploited swiftly, emphasizing the importance of security measures and server configurations.

• Multiple Fixed Versions: Updates have been released, including Action View 6.0.0.beta3 and several earlier versions, providing a pathway for developers to secure their applications against this threat.

• Proof of Concept: Detailed demonstrations are available to illustrate the exploitation of this vulnerability and to aid developers in understanding its impact.

• Online Technical Analysis: Various analyses are accessible, offering insights into the technical aspects of the vulnerability and recommendations for mitigation.