Webos meme

A screenshot of the exploit in action. This exploit is mainly of interest to other researchers - if you just want to root your TV, you probably want RootMyTVwhich offers a reliable 1-click persistent root. Note that this exploit webos meme non-persistent, and currently only works with bit devices on WebOS 4, webos meme. I'm publishing this as a standalone exploit because I don't think it would work very well as part of RootMyTV.

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Webos meme

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I'm publishing this as a standalone exploit because I don't think it would work very well as part of RootMyTV. This exploit starts with enabling Developer Modewhich is a feature officially supported by LG, webos meme.

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It's a free online image maker that lets you add custom resizable text, images, and much more to templates. People often use the generator to customize established memes , such as those found in Imgflip's collection of Meme Templates. However, you can also upload your own templates or start from scratch with empty templates. The Meme Generator is a flexible tool for many purposes. By uploading custom images and using all the customizations, you can design many creative works including posters, banners, advertisements, and other custom graphics. Animated meme templates will show up when you search in the Meme Generator above try "party parrot".

Webos meme

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Drustvar

However, my goal for this exploit chain was to not use any IPC-based exploits, so I looked elsewhere. To this end, I wrote two different shellcodes. If I'm already walking kernel structs, why not just directly iterate through the task list? On a regular desktop computer, this can bring the time to create a context from 40 ms down to less than 2 ms. I'm going to call it WAM for short. I feel reasonably ethical in dropping it as an 0day because it requires sideloading an app as a prerequisite, so the risk of someone being unwittingly compromised is low. Every newly-created V8 context has these functions available from the start. The bug is that LG allows an unprivileged user to supply custom snapshots to a relatively privileged instance of V8. If our saved gid changed then we know we found the right task, and we fully elevate the creds to root. If our saved gid didn't change, then we restore the original and continue our search. Fortunately, I was able to adapt those techniques without too much hassle. Which leads us on to One speed-bump was that my TV runs a bit V8 build. However, I eventually mastered the dark arts, thanks to a few things:.

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As far as I can tell, LG doesn't document this v8SnapshotFile key anywhere publicly, but there's nothing stopping us from using it in our own apps. And there we have it - proof that a corrupted startup blob can corrupt V8's heap. If you want to fully understand my V8 exploit, I suggest you read both of those, and then my exploit source code , which I commented liberally. My exploit is largely derived from these, with changes to support the bit V8 build that we're dealing with here. You'll have to read the full source for the rest of the details, but, Spoiler Alert: we get shellcode execution at the end. Fortunately, V8 uses a shortcut to speed things up: just like thawing a frozen pizza for a quick dinner, we deserialize a previously-prepared snapshot directly into the heap to get an initialized context. The addrof and fakeobj primitives are set up like so:. So, we can launch our own apps with a custom V8 heap setup. And then, the moment you've been waiting for:. This sounded painful to exploit, so I never bothered trying. Native apps run inside a Linux jail as an unprivileged user just like the developer mode SSH server , whereas "web" apps rely on the browser engine itself to provide the sandboxing i. LG, in their infinite wisdom, decided to make it world-writeable. One is called shellcode. Despite this, there is no V8 0day here, it's just how it's intended to work as far as I can tell.