[Freeswitch-users] faxploit

mayamatakeshi mayamatakeshi at gmail.com
Tue Aug 25 21:22:42 UTC 2020

On Wed, Aug 26, 2020 at 2:47 AM Brian West <brian at freeswitch.com> wrote:

> Spoke with Steve,
> He says:
> What is described there does not appear to be a problem with the FAX
> protocol, even though the text says it is. They refer to problems
> handling DHT (define huffman table) and COM (comment) sections when they
> are used incorrectly. Those are tags in JPEG images. It looks like that
> are talking about an issue with JPEG decoders that don't allow for
> certain types of corrupt image, and the exploit would be specific to
> particular models of FAX machines. The problem would be in the JPEG
> decoder itself. Spandsp calls the system's JPEG library to do that
> decoding. Any flaw that might exist would be in that system's JPEG library.
Steve and Brian,
Yes, that's it:

*While their research was undoubtedly eye-opening, similar headlines and
statements claiming that the “T.30 protocol itself has been compromised” *

*are categorically false; a bit of drama designed to make headlines. More
specifically, the researches were able to demonstrate the Faxploit by
exposing *

*a flaw in software developed internally at HP, rendering it vulnerable
when handling color/JPEG faxes. *

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