Bump net-imap from 0.6.3 to 0.6.4

[dependabot]

Bumps net-imap from 0.6.3 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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