Executive Summary

This vulnerability exists in the Net::IMAP Ruby library, which implements IMAP client functionality. Before versions 0.6.5 and 0.5.15, when the Net::IMAP#id method was called with a hash argument, the ID field values were quoted correctly but not validated to prevent CRLF (Carriage Return Line Feed) sequences. Additionally, the Net::IMAP#enable method processes its arguments but does not validate them as valid atoms, sending the string representation verbatim. These issues allow an attacker to inject arbitrary IMAP commands by crafting malicious arguments.

The vulnerability was fixed in versions 0.6.5 and 0.5.15 by adding proper validation to prevent such injection.

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Impact Analysis

An attacker exploiting this vulnerability could inject arbitrary IMAP commands into the communication with the IMAP server. This could lead to unauthorized actions being performed on the mail server, such as accessing, modifying, or deleting emails, or disrupting normal IMAP operations.

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Mitigation Strategies

To mitigate this vulnerability, update the Net::IMAP Ruby library to version 0.6.5 or later, or 0.5.15 or later, where the issue has been fixed.

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