[Security] Bump phpmailer/phpmailer from 6.0.7 to 6.1.6

[dependabot-preview]

Bumps phpmailer/phpmailer from 6.0.7 to 6.1.6. This update includes a security fix.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Insufficient output escaping of attachment names in PHPMailer

Impact

CWE-116: Incorrect output escaping.

An attachment added like this (note the double quote within the attachment name, which is entirely valid):

$mail->addAttachment('/tmp/attachment.tmp', 'filename.html";.jpg');

Will result in a message containing these headers:

Content-Type: application/octet-stream; name="filename.html";.jpg"
Content-Disposition: attachment; filename="filename.html";.jpg"

The attachment will be named filename.html, and the trailing ";.jpg" will be ignored. Mail filters that reject .html attachments but permit .jpg attachments may be fooled by this.

Note that the MIME type itself is obtained automatically from the source filename (in this case attachment.tmp, which maps to a generic application/octet-stream type), and not the name given to the attachment (though these are the same if a separate name is not provided), though it can be set explicitly in other parameters to attachment methods.

Patches

Patched in PHPMailer 6.1.6 by escaping double quotes within the name using a backslash, as per RFC822 section 3.4.1, resulting in correctly escaped headers like this:

Content-Type: application/octet-stream; name="filename.html\";.jpg"

... (truncated)

Affected versions: < 6.1.6

Release notes

Sourced from phpmailer/phpmailer's releases.

PHPMailer 6.1.6

This is a security release, with some other minor changes. For full details, refer to the advisory.

• SECURITY Fix insufficient output escaping bug in file attachment names. CVE-2020-13625. Reported by Elar Lang of Clarified Security.
• Correct Armenian ISO language code from am to hy, add mapping for fallback
• Use correct timeout property in debug output

PHPMailer 6.1.5

This is a maintenance release.

• Reject invalid custom headers that are empty or contain breaks
• Various fixes for DKIM issues, especially when using mail() transport
• Drop the l= length tag from DKIM signatures; it's a mild security risk
• Ensure CRLF is used explicitly when needed, rather than static::$LE
• Add a method for trimming header content consistently
• Some minor tweaks to resolve static analyser complaints
• Check that attachment files are readable both when adding and when sending
• Work around Outlook bug in mishandling MIME preamble
• Danish translation improvements

PHPMailer 6.1.4

The RFC2047 folding added in 6.1.0 was a little overenthusiastic; It will now only happen when header lines exceed 998 chars.

• Clean up hostname handling
• Avoid IDN error on older PHP versions, prep for PHP 8.0
• Don't force RFC2047 folding unnecessarily
• Enable tests on full release of PHP 7.4

PHPMailer 6.1.3

• Fix an issue preventing injected debug handlers from working
• Fix an issue relating to connection timeout
• Add SMTP::MAX_REPLY_LENGTH constant
• Remove some dev dependencies; phpdoc no longer included
• Fix an issue where non-compliant servers returning bare codes caused an SMTP hang

PHPMailer 6.1.2

• Substantial revision of DKIM header generation
• Use shorter hashes for auto-generated CID values
• Fix format of content-id headers, and only use them for inline attachments
• Remove all use of XHTML
• Lots of coding standards cleanup
• API docs are now auto-updated via GitHub actions
• Fix header separation bug created in 6.1.1
• Fix misidentification of background attributes in SVG images in msgHTML

PHPMailer 6.1.1

No code changes, just retagging for a misordered commit for 6.1.0.

PHPMailer 6.1.0

... (truncated)

Changelog

Sourced from phpmailer/phpmailer's changelog.

Version 6.1.6 (May 27th, 2020)

• SECURITY Fix insufficient output escaping bug in file attachment names. CVE-2020-13625. Reported by Elar Lang of Clarified Security.
• Correct Armenian ISO language code from am to hy, add mapping for fallback
• Use correct timeout property in debug output

Version 6.1.5 (March 14th, 2020)

• Reject invalid custom headers that are empty or contain breaks
• Various fixes for DKIM issues, especially when using mail() transport
• Drop the l= length tag from DKIM signatures; it's a mild security risk
• Ensure CRLF is used explicitly when needed, rather than static::$LE
• Add a method for trimming header content consistently
• Some minor tweaks to resolve static analyser complaints
• Check that attachment files are readable both when adding and when sending
• Work around Outlook bug in mishandling MIME preamble
• Danish translation improvements

Version 6.1.4 (December 10th, 2019)

• Clean up hostname handling
• Avoid IDN error on older PHP versions, prep for PHP 8.0
• Don't force RFC2047 folding unnecessarily
• Enable tests on full release of PHP 7.4

Version 6.1.3 (November 21st, 2019)

• Fix an issue preventing injected debug handlers from working
• Fix an issue relating to connection timeout
• Add SMTP::MAX_REPLY_LENGTH constant
• Remove some dev dependencies; phpdoc no longer included
• Fix an issue where non-compliant servers returning bare codes caused an SMTP hang

Version 6.1.2 (November 13th, 2019)

• Substantial revision of DKIM header generation
• Use shorter hashes for auto-generated CID values
• Fix format of content-id headers, and only use them for inline attachments
• Remove all use of XHTML
• Lots of coding standards cleanup
• API docs are now auto-updated via GitHub actions
• Fix header separation bug created in 6.1.1
• Fix misidentification of background attributes in SVG images in msgHTML

Version 6.1.1 (September 27th 2019)

• Fix misordered version tag

Version 6.1.0 (September 27th 2019)

• Multiple bug fixes for folding of long header lines, thanks to @caugner
• Add support for RFC2387 child element content-type hint in multipart/related structures.
• Support for Ical event methods other than REQUEST, thanks to @puhr-mde
• Change header folding and param separation to use spaces instead of tabs
• Use ; to separate multiple MIME header params
• Add support for RFC3461 DSN messages
• IMAP example code fixed

... (truncated)

Commits

• c2796cb Merge pull request from GHSA-f7hx-fqxw-rvvj
• a7f1b23 Add funding info
• 5b63b39 Fix typos (#2037)
• c1c38e3 Correct Armenian language code
• a12c95e Use correct timeout property in debug output, clarify debug output, see #2018
• a8bf068 6.1.5
• 2e72725 Rewrite and extension of translation (#1989)
• 55e0b34 Fix issue #2008 - MS Outlook corrupts formatting multipart EML files (#2009)
• a55152f Typo fix for #2007
• e9710ee Update README.md (#2004)
• Additional commits viewable in compare view

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