Executive Summary

This vulnerability exists in the Net::IMAP library, which implements IMAP client functionality in Ruby. Before versions 0.6.5 and 0.5.15, some Net::IMAP commands accept a raw string argument that is only checked to prevent CRLF injection but is otherwise sent exactly as provided.

If this raw string comes from user input, an attacker can manipulate it so that the next IMAP command is treated as a continuation of the first command. This causes the first command to fail eventually but also blocks it from returning a response until another command is sent from a different thread.

The other command will then not return until the connection is closed, effectively causing a denial of service or blocking behavior. This issue was fixed in versions 0.6.5 and 0.5.15 of Net::IMAP.

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Impact Analysis

This vulnerability can impact you by causing IMAP commands to hang or block indefinitely, leading to denial of service conditions in applications using vulnerable versions of Net::IMAP.

An attacker who can supply user-controlled input to these commands can exploit this behavior to disrupt normal IMAP client operations, potentially affecting email retrieval or processing.

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Mitigation Strategies

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

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