Katsuhiko Yoshida

Name of the Vulnerable Software and Affected Versions: Mechanize versions 2.0.0 through 2.7.6 Description: Mechanize is an open-source ruby library that makes automated web interaction easy. Affected versions of Mechanize allow for OS commands to be injected using several classes' methods which implicitly use Ruby's Kernel.open method. Exploitation is possible only if untrusted input is used as a local filename and passed to any of these calls: Mechanize::CookieJar#load, Mechanize::CookieJar#save as, Mechanize#download, Mechanize::Download#save, Mechanize::File#save, and Mechanize::FileResponse#read body. Recommendations: To resolve the issue, update to Mechanize version 2.7.7 or later. As a temporary workaround, consider avoiding the use of untrusted input as a local filename when calling the affected methods. Restrict access to the vulnerable classes and methods to minimize the risk of exploitation. Avoid using the affected methods with untrusted input until the issue is resolved.

**Name of the Vulnerable Software and Affected Versions** Nokogiri versions 1.10.3 and earlier Rexical versions 1.0.6 and earlier **Description** A command injection issue allows commands to be executed in a subprocess via Ruby's `Kernel.open` method. This occurs when the undocumented method `Nokogiri::CSS::Tokenizer#load file` is called with unsafe user input as the filename. The vulnerability is related to the Rexical gem, which is used by Nokogiri to generate lexical scanner code for parsing CSS queries. **Recommendations** For Nokogiri versions 1.10.3 and earlier, update to Nokogiri v1.10.4 or later, which includes the upgraded Rexical version that addresses the underlying vulnerability. For Rexical versions 1.0.6 and earlier, update to Rexical v1.0.7 or later to resolve the issue. As a temporary workaround, consider avoiding the use of the `Nokogiri::CSS::Tokenizer#load file` method with user-inputted filenames until a patch is applied.