[exim-dev] [Bug 3056] New: Distinct tags with same first let…

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Author: Exim Bugzilla
Date:  
To: exim-dev
Subject: [exim-dev] [Bug 3056] New: Distinct tags with same first letter overwrite each other
https://bugs.exim.org/show_bug.cgi?id=3056

            Bug ID: 3056
           Summary: Distinct tags with same first letter overwrite each
                    other
           Product: Exim
           Version: N/A
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: DKIM
          Assignee: tom@???
          Reporter: max@???
                CC: exim-dev@???


When DKIM-Signature contains "d=" and "darn=" tags (observed in the wild from
google), value of the latter overwrites the former. This happens because
pdkim_parse_sig_header() has a switch only on the first char of cur_tag->s.

The tag is possibly related to
https://datatracker.ietf.org/doc/draft-chuang-replay-resistant-arc/

Possible fix is
https://github.com/darkwrat/exim/commit/c1314a753a089706a1c3712d9bc918fdcbc5df54
-- applied internally in september, no issue since.

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