Some vulnerabilities have been reported in the Mail gem for Ruby, which can be exploited by malicious people to manipulate certain data and compromise a vulnerable system.

1) Input passed via the "to" parameter within the file delivery method is not properly verified before being used and can be exploited to modify arbitrary files via directory traversal attacks.

2) Certain input passed to the sendmail and exim delivery methods is not properly sanitised before being used as a command line argument and can be exploited to inject arbitrary shell commands.

Successful exploitation of this vulnerability may allow execution of arbitrary code, but requires an application using the gem to accept untrusted input.

The vulnerabilities are reported in versions prior to 2.4.4.

Solution
Update to version 2.4.4.

Provided and/or discovered by
Reported by the vendor.

Original Advisory
https://github.com/mikel/mail/blob/master/CHANGELOG.rdoc

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