CVE-2017-10784 : Exploit Details and Defense Strategies

The Basic authentication code in the Ruby WEBrick library versions prior to 2.2.8, 2.3.x prior to 2.3.5, and 2.4.x through 2.4.1 has a vulnerability that enables attackers to inject terminal emulator escape sequences into the log and potentially execute unauthorized commands by manipulating the user name in a malicious manner.

Understanding CVE-2017-10784

This CVE entry describes a security vulnerability in the Ruby WEBrick library that allows remote attackers to inject terminal emulator escape sequences into its log and potentially execute arbitrary commands.

What is CVE-2017-10784?

The Basic authentication code in the Ruby WEBrick library versions prior to 2.2.8, 2.3.x prior to 2.3.5, and 2.4.x through 2.4.1 has a vulnerability that enables attackers to inject terminal emulator escape sequences into the log and potentially execute unauthorized commands by manipulating the user name in a malicious manner.

The Impact of CVE-2017-10784

Attackers can inject terminal emulator escape sequences into the log, leading to potential execution of unauthorized commands.

Technical Details of CVE-2017-10784

The following technical details provide more insight into the CVE-2017-10784 vulnerability.

Vulnerability Description

The Basic authentication code in the Ruby WEBrick library in versions before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows remote attackers to inject terminal emulator escape sequences into its log and possibly execute arbitrary commands via a crafted user name.

Affected Systems and Versions

Ruby WEBrick library versions prior to 2.2.8
Ruby WEBrick library 2.3.x versions prior to 2.3.5
Ruby WEBrick library 2.4.x versions through 2.4.1

Exploitation Mechanism

The vulnerability can be exploited by manipulating the user name in a malicious manner, allowing attackers to inject terminal emulator escape sequences into the log.

Mitigation and Prevention

To address CVE-2017-10784, consider the following mitigation and prevention strategies.

Immediate Steps to Take

Update Ruby WEBrick library to versions 2.2.8, 2.3.5, or above to mitigate the vulnerability.
Monitor and review user inputs to detect any attempts to manipulate user names.

Long-Term Security Practices

Implement input validation mechanisms to prevent malicious user inputs.
Regularly update and patch software components to address known vulnerabilities.

Patching and Updates

Apply patches provided by Ruby to fix the vulnerability.