[exim-dev] [Bug 3001] infoleak in SPA authenticator, client

https://bugs.exim.org/show_bug.cgi?id=3001

Jeremy Harris <jgh146exb@???> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|medium                      |high
           Assignee|unallocated@???        |jgh146exb@???
                 CC|                            |exim-dev@???
          Component|Unfiled                     |SMTP Authentication
            Summary|(placeholder)               |infoleak in SPA
                   |                            |authenticator, client

--- Comment #1 from Jeremy Harris <jgh146exb@???> ---
ZDI-CAN-17433 (Trend Micro)

A crafted SPA challenge from the server can cause the client authenticator
to read OOB; the data is then returned to the server.

Fix: validate the offset contained in the challenge, to avoid reading
past the end of the challenge data structure.

Vulnerable since at least 4.50, probably longer.

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