Learn about CVE-2021-21305, a code injection vulnerability in CarrierWave versions prior to 1.3.2 and 2.1.1, allowing attackers to execute Ruby code, potentially leading to remote code execution. Find out the impact, affected systems, and mitigation steps.
CarrierWave, an open-source RubyGem, is susceptible to a code injection vulnerability in versions prior to 1.3.2 and 2.1.1. The vulnerability arises from the inappropriate evaluation of the content of the mutation option(:read/:write), enabling attackers to execute arbitrary Ruby code. This could potentially lead to remote code execution (RCE). The issue has been addressed in versions 1.3.2 and 2.1.1.
Understanding CVE-2021-21305
CarrierWave is a RubyGem used for file uploading in Ruby applications. The vulnerability in versions before 1.3.2 and 2.1.1 allows for code injection through improper evaluation of input content.
What is CVE-2021-21305?
CVE-2021-21305 is a code injection vulnerability in CarrierWave versions prior to 1.3.2 and 2.1.1. Attackers can exploit this vulnerability to execute malicious Ruby code, potentially leading to remote code execution.
The Impact of CVE-2021-21305
The impact of CVE-2021-21305 is rated as HIGH based on the CVSS v3.1 score of 7.4. The vulnerability has a low attack complexity and requires no user interaction, posing a significant risk of remote code execution.
Technical Details of CVE-2021-21305
The vulnerability allows attackers to craft a string that can be executed as Ruby code, leading to potential remote code execution.
Vulnerability Description
In CarrierWave versions before 1.3.2 and 2.1.1, the "#manipulate!" method inappropriately evaluates the content of the mutation option, enabling code injection.
Affected Systems and Versions
Exploitation Mechanism
Attackers can exploit this vulnerability by supplying untrusted inputs to the option, allowing the execution of crafted Ruby code.
Mitigation and Prevention
To mitigate the risk associated with CVE-2021-21305, users should take immediate actions and adopt long-term security practices.
Immediate Steps to Take
Long-Term Security Practices
Patching and Updates