<div dir="ltr">Spoke with Steve,<div><br></div><div>He says:</div><div><br></div><div><div class="gmail-gs" style="margin:0px;padding:0px 0px 20px;width:3424px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:medium"><div class="gmail-"><div id="gmail-:1q8" class="gmail-ii gmail-gt gmail-adO" style="font-size:0.875rem;direction:ltr;margin:8px 0px 0px;padding:0px"><div id="gmail-:1q7" class="gmail-a3s gmail-aXjCH" style="overflow:hidden;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif">What is described there does not appear to be a problem with the FAX<br>protocol, even though the text says it is. They refer to problems<br>handling DHT (define huffman table) and COM (comment) sections when they<br>are used incorrectly. Those are tags in JPEG images. It looks like that<br>are talking about an issue with JPEG decoders that don't allow for<br>certain types of corrupt image, and the exploit would be specific to<br>particular models of FAX machines. The problem would be in the JPEG<br>decoder itself. Spandsp calls the system's JPEG library to do that<br>decoding. Any flaw that might exist would be in that system's JPEG library.<br><br>Regards,<br><br>Steve</div></div><div class="gmail-hi" style="border-bottom-left-radius:1px;border-bottom-right-radius:1px;padding:0px;width:auto;background:rgb(242,242,242);margin:0px"></div></div></div><br class="gmail-Apple-interchange-newline"></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 24, 2020 at 4:14 AM mayamatakeshi <<a href="mailto:mayamatakeshi@gmail.com">mayamatakeshi@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi,<div><i><font face="monospace"><br></font></i></div><div><span style="color:rgb(51,51,51)"><i><font face="monospace">Check Point researchers have discovered a vulnerability in the ITU T.30 fax protocol that could be hacked to launch a cyberattack and gain access to a network.</font></i></span><br></div><div><br></div><div><a href="https://www.healthcareitnews.com/news/fax-machines-can-be-hacked-breach-network-using-only-its-number" target="_blank">https://www.healthcareitnews.com/news/fax-machines-can-be-hacked-breach-network-using-only-its-number</a><br></div><div><br></div><div><div>The phrase above indicates a flaw in the T.30 protocol itself and not in particular¬†implementations.</div><div></div></div><div>This is from 2018.¬†</div><div>I don't remember reading anything about this in the fs mailing list.</div><div><br></div><div>Was freeswitch/spandsp audited¬†to ensure application rxfax is safe?</div><div><br></div><div><a href="https://blog.checkpoint.com/2018/08/12/faxploit-hp-printer-fax-exploit/" target="_blank">https://blog.checkpoint.com/2018/08/12/faxploit-hp-printer-fax-exploit/</a><br></div><div><br></div><div><br></div></div>
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