https://bugs.exim.org/show_bug.cgi?id=3168
Bug ID: 3168
Summary: ${rfc2047:} expansion is generating encoded-words
longer than permitted in RFC 2047
Product: Exim
Version: 4.98.2
Hardware: x86-64
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: String expansion
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Section 2 of RFC 2047 states:
====
An 'encoded-word' may not be more than 75 characters long, including
'charset', 'encoding', 'encoded-text', and delimiters.
====
However, it is trivial to generate an expansion which exceeds 75 characters in
a single encoded-word:
$ exim -be
'${rfc2047:1234567,1234567,1234567,1234567,1234567,1234567,1234567,}'
=?ISO-8859-1?Q?1234567=2C1234567=2C1234567=2C1234567=2C1234567=2C1234567=2C1234567=2C?=
$ exim -be
'${rfc2047:1234567,1234567,1234567,1234567,1234567,1234567,1234567,}' | wc -c
88
The issue seems to be that parse_quote_2047 in src/src/parse.c is counting the
equals-encoded characters as 1 character based on its length at input, rather
than the 3 characters it is in length at output. I also think that the magic
constant of 67 being compared against has some faulty assumptions built into
it.
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