build(deps): bump net-imap from 0.5.10 to 0.6.4

[dependabot]

Bumps net-imap from 0.5.10 to 0.6.4.

Release notes

Sourced from net-imap's releases.

v0.6.4

What's Changed

🔒 Security

This release contains fixes for multiple vulnerabilities concerning STARTTLS stripping, argument validation, and denial of service attacks.

[!WARNING] ruby/net-imap#664 fixes a STARTTLS stripping vulnerability (GHSA-vcgp-9326-pqcp). Without this fix, a man-in-the-middle attacker can cause Net::IMAP#starttls to return "successfully", without starting TLS.

[!IMPORTANT] Argument validation is significantly improved. Several injection vulnerabilities have been fixed: ruby/net-imap#657 fixes CRLF/command/argument injection via Symbol arguments (GHSA-75xq-5h9v-w6px). ruby/net-imap#658 fixes CRLF/command/argument injection via the attr argument to #store/#uid_store (GHSA-hm49-wcqc-g2xg) ruby/net-imap#659 fixes CRLF/command/argument injection via the storage_limit argument to #setquota (GHSA-hm49-wcqc-g2xg). ruby/net-imap#660 fixes CRLF/command injection via RawData (GHSA-hm49-wcqc-g2xg):

• #search and #uid_search send criteria as raw data, when it is a String
• #fetch and #uid_fetch send attr as raw data, when it is a String. When attr is an Array, its String members are sent as raw data.

[!CAUTION] RawData does not defend against other forms of argument injection! It is an intentionally low-level API.

[!NOTE] Two denial of service vulnerabilities have been addressed. These are generally only relevant when connecting to an untrusted hostile server (or without TLS).

ruby/net-imap#642 fixes quadratic time complexity when reading large responses containing many string literals (GHSA-q2mw-fvj9-vvcw). ruby/net-imap#654 adds a configurable max_iterations count for SCRAM-* authentication (GHSA-87pf-fpwv-p7m7).

The default ScramAuthenticator#max_iterations is 2**31 - 1 (max 32-bit signed int), which was already OpenSSL's maximum value. It provides no protection against hostile servers unless it is explicitly set to a lower value by the user.

Breaking Changes

• ⚡ ResponseReader memoizes Config#max_response_size in ruby/net-imap#642. Changes to #max_response_size now take effect once per response, not on every IO#read. NOTE: It is not expected that this will affect any current usage. See the PR for details.

Added

• ✨ Support BINARY extention to #append (RFC3516) by @​nevans in ruby/net-imap#616
• ✨ Support LITERAL+ and LITERAL- non-synchronizing literals (RFC7888) by @​nevans in ruby/net-imap#649
• 🔒 Add ScramAuthenticator#max_iterations by @​nevans in ruby/net-imap#654
• 🏷️ Add number64 and nz-number64 to NumValidator by @​nevans in ruby/net-imap#625
• ♻️ Add MailboxQuota#quota_root alias by @​nevans in ruby/net-imap#636
• 🔍 Simplify Net::IMAP#inspect with basic state by @​nevans in ruby/net-imap#612
• 🥅 Add ResponseParseError#parser_methods (and override #==) by @​nevans in ruby/net-imap#615

Fixed

... (truncated)

Commits

• 3e49067 🔖 Bump version to 0.6.4
• 0ede4c4 🔀 Merge pull request #664 from ruby/security/STARTTLS-stripping
• 51ae360 ♻️ Add command response handler before command is sent
• 24d5c77 🔒🥅 Handle tagged "OK" to incomplete command
• 62eea6f 🔒🥅 Ensure STARTTLS tagged response was handled
• 46636ca ❌🔒 Add failing test for STARTTLS stripping
• e3b0105 ✅♻️ Inline current STARTLS stripping test
• be32e71 📚 Improve documentation of RawData arguments
• 47c7218 🐛 Validate RawData and wait to continue literals
• 0ec4fd3 🥅 Validate #setquota storage limit argument
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[github-actions]

@dependabot merge

[codacy-production]

Up to standards ✅

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AI Reviewer: first review requested successfully. AI can make mistakes. Always validate suggestions.

_{TIP This summary will be updated as you push new changes.}

[codacy-production]

Pull Request Overview

This PR successfully updates the net-imap gem from 0.5.10 to 0.6.4 to address critical security vulnerabilities, including STARTTLS stripping (GHSA-vcgp-9326-pqcp), command/argument injection, and potential Denial of Service (DoS) vectors.

Codacy analysis confirms the changes are up to standards with no new issues or complexity increases. While the version bump effectively incorporates the fixes, the PR does not include updated automated tests to verify these security remediations within the specific application context.

Test suggestions

• Verify successful IMAP connection and authentication with the upgraded net-imap gem.
• Verify STARTTLS functionality is correctly enforced during connection to prevent stripping attacks.

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. Verify successful IMAP connection and authentication with the upgraded net-imap gem.
2. Verify STARTTLS functionality is correctly enforced during connection to prevent stripping attacks.

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