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This is due to the ‘snippet’ functionality embedded within Instagram in which photos from your mobile media library are automatically parsed and presented once the Instagram application starts.”Īhmed told me that Check Point has produced a full technical report into the exploit, “we have shared this report with Facebook along with the fact the we believe this vulnerability is exploitable, and have not received any rejections for this claims until today. According to Ahmed, “the malicious picture in the scenario we described does not have to be manually uploaded to Instagram. Unsurprisingly, Check Point agrees with this latter point.Ĭheck Point has also dismissed Facebook’s rebuttal as to the nature of the vulnerability. Despite saying the issue was “overstated,” Facebook also pointed out that the worst case would be a single user’s account being hijacked, not a wider attack on the platform, seeming to contradict the denial of the issue. So it’s just required for a user to open Instagram in order to be exploited, nothing more.”įacebook takes a different view, disputing that this is a so-called “zero-click attack,” claiming that a user would need to upload the image to Instagram to crash the app and open it to an attack. You can see them if you push the post button on the app (at the bottom of the screen). “Okay, so when you have a photo on your phone, the second you open Instagram the app will automatically try to load these images for you. This causes an overwrite and lets us do our magic.”Ĭheck Point says that just opening Instagram after the malicious image was saved onto a phone would trigger the exploit. “The issue was a buffer overflow,” Balmas told me, “caused by sending a picture with a large size which fools the application into believing it’s much smaller.
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The issue exposed by Check Point lies with the implementation of Mozjpeg, an open source, third-party code library buried within Instagram, one that parses JPEG images within the app. Now is the only time that Facebook has claimed the vulnerability is not an RCE. We first informed Facebook in February 2020-then again in April and September all instances were prior to publication.
Every detail was fully and transparently disclosed to Facebook.
In response to Facebook’s claim that the issue has been overstated, Check Point’s Ekram Ahmed told me that “we firmly stand behind our publication, which we believe clearly demonstrates how the vulnerability is carried out.
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