Summary:
VLC for iOS was vulnerable to an unauthenticated insecure direct object reference (IDOR) which could allow a local attacker to steal media from the storage by just navigating to the source URL/IP.
This was possible by abusing a functionality in the iOS application for VLC, which allows a user to share files with others over WiFi. This can be simply done by enabling "Network > Sharing via WiFi" and the web-server for this functionality works on port 80(http) protocol.
Technical analysis:
Let's assume a scenario where Bob & Alice are sharing a video over the WiFi using vlc-iOS, Eve could perform this attack by crawling the source IP address of Bob which would list the URL's of the videos shared between Bob & Alice.
Having said that, navigating to those URL's Eve could simply steal the video without Bob's knowledge which successfully leads to unauthenticated IDOR.
In the below image, Bob's IP is 192.168.1.135 and the hierarchy of stored videos in Bob's phone would look like,
Such things can be crawled via burpsuite or you can use python scrapy to extract the URL's from the host and download the videos.
Mitigation from VLC Security team:
They implemented a user-friendly authentication mechanism on VLC iOS web server for WiFi Sharing. Passcode authentication is enabled when VLC's passcode setting is enabled and the user uses the passcode that he set in VLC's settings to log into Wifi Sharing.
This was reported on 2nd Jan 2019 and patched on 10th Feb 2020 whereas fixed version was publicly released in March 2020. Post mitigation VLC published an advisory for this which you can view here . Aside this issue was accepted for bounty on The Internet .
以上所述就是小编给大家介绍的《Stealing videos from vlc》，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对 码农网 的支持！
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