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Bad Content-ID formatting handling in DetectAttachment filter fixed #413

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Proposed change

Znuny throws

Use of uninitialized value $ImageID in quotemeta at [...]DetectAttachment.pm line 65

error when importing e-mail message with inline image with Content-ID header value without <>. Such formatting is not allowed by RFC https://datatracker.ietf.org/doc/html/rfc2392#section-2 but is accepted Znuny in

https://github.com/znuny/Znuny/blob/rel-6_0/Kernel/System/Ticket/Article/Backend/MIMEBase/ArticleStorageFS.pm#L372

so it should tolerate it also in DetectAttachment.pm. This mod fixes it.

I also reverts 61cfc74 because HTML tags and attributes are case insensitive:

61cfc74#commitcomment-110812670

Type of change

  • '1 - 🐞 bug 🐞' - Bugfix (non-breaking change which fixes an issue)

Additional information

Replaces: #192
Related: https://datatracker.ietf.org/doc/html/rfc2392#section-2
Fixes: 61cfc74
Author-Change-Id: IB#1114877

Checklist

  • The code change is tested and works locally.(❗)
  • There is no commented out code in this PR.(❕)
  • You improved or added new unit tests.(❕)
  • Local ZnunyCodePolicy passed.(❕)
  • Local UnitTests / Selenium passed.(❕)
  • GitHub workflow CI (UnitTests / Selenium) passed.(❗)

Znuny throws

`Use of uninitialized value $ImageID in quotemeta at [...]DetectAttachment.pm line 65`

error when importing e-mail message with inline image with Content-ID header value
without <>. Such formatting is not allowed by RFC

https://datatracker.ietf.org/doc/html/rfc2392#section-2

but is accepted Znuny in

https://github.com/znuny/Znuny/blob/rel-6_0/Kernel/System/Ticket/Article/Backend/MIMEBase/ArticleStorageFS.pm#L372

so it should tolerate it also in DetectAttachment.pm.

This mod fixes it.

I also reverts 61cfc74 because HTML tags and attributes are case insensitive:

znuny@61cfc74#commitcomment-110812670

Related: https://datatracker.ietf.org/doc/html/rfc2392#section-2
Fixes: 61cfc74
Author-Change-Id: IB#1114877
Fixes: 1581fff
Author-Change-Id: IB#1114877
Author-Change-Id: IB#1114877
Author-Change-Id: IB#1114877
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1 - 🐞 bug 🐞 An issue with the system.
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