Re: [exim] CVE-2019-10149: already vulnerable ?

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Autor: Ian Zimmerman
Datum:  
To: exim-users
Betreff: Re: [exim] CVE-2019-10149: already vulnerable ?
On 2019-07-03 21:42, Jeremy Harris wrote:

> > \\x24 should match the literal \x24, which may be used to encode the
> > dollar sign for the unintended local_part expansion in the vulnerable
> > code.


After your important discovery that escaping is done on local parts as
part of SMTP (at least that's how I interpreted the disappearance of the
backslash from "it\z"), the next question should be but has not yet
been: why is this needed at all? Won't the whole escape sequence be
transformed into a dollar sign by the time it is matched against the
rule?

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