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Old 11-12-2011, 03:00 PM   #61
yifanlu
Kindle Dissector
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Ok, a tiny progress. I've found a way to access/read most files on the Kindle. However, I can't pass arguments. So it's basically useless. However, if we didn't have a NAND dump, it would have been useful.
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Old 11-13-2011, 12:56 AM   #62
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Also, here's a webkit code execution exploit that works on the Kindle 4.

http://imthezuk.blogspot.com/2010/11...fter-free.html
http://trac.webkit.org/changeset/64706

However, the POC linked above is designed for Android 2.1 and just does a DoS on the Kindle 3/4. When I have time, I'll play around with it to see if I can get the pointer right.

The shell code for above tries to call /system/bin/sh while Kindle uses /bin/sh, so the shell code needs to change too. Also, the current shell code tries to open a reverse shell. When testing it out to see if it works, on your computer, do "nc -l 12345". Set your computer's ip and port in hex in the HTML file, ln -sf /bin/sh /system/bin/sh, and load it with your Kindle. Then mess with the pointer found in the NaN() until you can type in shell commands on your computer and it loads on the Kindle (no output though). If THAT works, then I can modify the shell code to jailbreak. Have fun.
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Old 11-14-2011, 06:58 PM   #63
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As I've predicted, the days of unix filesystem/shell gliching is over. We must now find real exploits. I've spent the last few days exploring various binaries and system files and I've come up with a list of potential exploit vectors. I've listed them from most likely to least likely.

The thing we need to look for is for a part of the kindle that 1) accepts user input. Aka, reads files from the FAT32 partition. 2) Runs natively (no java involved, that's 95% of the Kindle OS). 3) preferably non-open source. Open source projects are usually very secure, as if an exploit exists, it would have been found long ago by smart people.

-PDF Reader. This seems like a great bet. The entire PDF library is a Java JNI library. /usr/java/lib/libAdobePDFReader.so and /usr/java/lib/libPDFReader.so. They are ~10MB total, so it would be easy to slip up somewhere. In addition, it is Amazon code (not open source). It also reads PDF files, a very complex file structure. There's bound to be a stack/heap/buffer overflow somewhere.
-libTopaz.so & libjniaudible.so. Found in the same dir as the pdf reader. These two are also amazon code, but there is less input to be read and the filesizes are small. However, there could be something there.
-/usr/bin/browserd. The Kindle webkit browser is actually a native code. The java frameworks "connects" to browserd through sockets and only feeds it urls and key input. I've spent most of my time analyzing this binary and I think it's a dead end. There are stack guards present and the only user input is URLs and a few files. None of the files have a complex structure and it reads them pretty straightforward. I did find 3 bugs in the binary, but none of them can lead to code execution. As someone mentioned, it uses an old version of webkit so we could use one of the many patched webkit exploits. I've tried a couple, but none of them worked. The kindle arch is very stripped down.
-Java framework - This is the GUI that you see. I'm sure there are tons of ways to crash the framework, but because of java's VM sandbox, most if not all are useless. I did stack overflow a couple of times but nothing useful came out of it.
-Linux filesystem - VERY unlikely. These files are pretty secure, but even worse, we don't really have access to any of them so if there is an exploit, we can't really feed data.

To have an idea of what to look for, here are some possible goals, from best bet to worse. Achieving any one of the following would make achieving the goals above it easier.

1) Running native code (duh)
2) Running a shell script/getting shell access
3) Writing to the root partition
4) Writing to the vars partition
5) Reading any partition other then the FAT32 one
6) Crashing native code
7) Crashing Java framework

Anyone else have any ideas?
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Old 11-15-2011, 05:29 AM   #64
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No ideas sorry, just words of encouragement.

I'm checking this thread every few days, can't say I have the skills to help but really appreciate the work you're doing. Thanks yifanlu!
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Old 11-15-2011, 10:45 AM   #65
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I second Zeromus, i just registered only to tell you how great your work is and how much we look forward to your Kindle4 hack !

BTW: My kindle arrives on 24. Dec, so you still have some time.
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Old 11-15-2011, 05:17 PM   #66
Richard.Kunze
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Quote:
Originally Posted by yifanlu View Post
-PDF Reader. This seems like a great bet. The entire PDF library is a Java JNI library. /usr/java/lib/libAdobePDFReader.so and /usr/java/lib/libPDFReader.so. They are ~10MB total, so it would be easy to slip up somewhere. In addition, it is Amazon code (not open source). It also reads PDF files, a very complex file structure. There's bound to be a stack/heap/buffer overflow somewhere.
Does the PDF reader use freetype to render embedded type1 fonts in PDF files?

If so, it may be vulnerable to CVE-2011-0226 (see http://esec-lab.sogeti.com/post/Anal...3-font-exploit for an analysis of a recent iPhone jailbreak using this exploit).
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Old 11-15-2011, 05:49 PM   #67
yifanlu
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yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.yifanlu can program the VCR without an owner's manual.
 
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Quote:
Originally Posted by Richard.Kunze View Post
Does the PDF reader use freetype to render embedded type1 fonts in PDF files?

If so, it may be vulnerable to CVE-2011-0226 (see http://esec-lab.sogeti.com/post/Anal...3-font-exploit for an analysis of a recent iPhone jailbreak using this exploit).
When I tried that, the kindle gave me this popup:
Quote:
This PDF cannot be opened due to embedded features not yet supported by Kindle.
Here are the relevant logs:
Quote:
111115:154758 cvm[3502]: E PDFBookViewer:Error::getNativeBookInfo
111115:154758 cvm[3502]: com.amazon.ebook.booklet.pdfreader.impl.PDFExcepti on:
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.PDFNativeI nterface.openPDFFile(Native Method)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.p.a(kdd:47 8)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.db.g(qdd:4 82)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.db.<init>( qdd:434)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.cb.Jb(do:2 14)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.cb.a(do:15 06)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:3925)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:1812)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:2098)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.q.a(dcd:438)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.b.b.start(qab:370)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:1560)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.start(qm:953)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.a(nk:27)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.A(nk:420)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.b(nk:163)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.a(nk:214)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.f.a(tec:416)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.e.run(tec:13)
111115:154758 cvm[3502]: at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:152)
111115:154758 cvm[3502]: at java.awt.EventQueue.dispatchEvent(EventQueue.java: 371)
111115:154758 cvm[3502]: at java.awt.EventQueueProxy.dispatchEvent(Compiled Method)(EventDispatchThread.java:351)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.pumpOneEvent(Compiled Method)(EventDispatchThread.java:164)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:154)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:149)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:134)
111115:154758 cvm[3502]: at java.lang.Thread.startup(Thread.java:1065)
111115:154758 cvm[3502]:
111115:154758 cvm[3502]: E Reader:BOOK INFO:book asin=unknown,file size=13468,file last mod date=2011-11-15 09.39.18 -0600,content type=ebook,length=0.0 (0 2) _ -1.0_ -1.0 0.0,access=2011-11-15 09.39.18 -0600,last read position=0.0 (0 2) _ -1.0_ -1.0 0.0,isEncrypted=false,isSample=false,isNew=true,is TTSMetdataPresent=false,isTTSMetadataAllowed=true, fileExtn=pdf:This PDF cannot be opened due to embedded features not yet supported by Kindle.
111115:154758 cvm[3502]: I HistoryManagerImpl:History cursor updated:action=set,oldCursorIndex=1,newCursorIndex =0:
111115:154758 cvm[3502]: W SystemBarImpl:SPIN:spinCount=0:count <=0 when stopSpinner() called
111115:154758 cvm[3502]: I BookletManager:SwitchingBooklets:from=Bookworm,to= Home:
111115:154758 cvm[3502]: W SystemBarImpl:SPIN:spinCount=0:count <=0 when stopSpinner() called
111115:154758 cvm[3502]: I lipc:gsprop=orientation, source=com.lab126.system:Get string property
111115:154758 cvm[3502]: I ContentCatalogImpl:ItemIterator:index=3,items=66,v olumes=6,time=2:Catalog Iteration done
111115:154758 cvm[3502]: I ContentCatalogImpl:ItemIterator:index=3,items=66,v olumes=6,time=1:Catalog Iteration done
111115:154758 cvm[3502]: I ContentCatalogImpl:ItemIterator:index=3,items=66,v olumes=6,time=31:Catalog Iteration done
111115:154758 cvm[3502]: W SystemBarImpl:SPIN:spinCount=0:count <=0 when stopSpinner() called
111115:154758 cvm[3502]: E Reader:Error::
111115:154758 cvm[3502]: com.amazon.ebook.booklet.reader.sdk.BookException: This PDF cannot be opened due to embedded features not yet supported by Kindle.
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.cb.a(do:76 5)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.cb.Jb(do:1 48)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.pdfreader.impl.cb.a(do:15 06)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:3925)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:1812)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:2098)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.q.a(dcd:438)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.b.b.start(qab:370)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.a(qm:1560)
111115:154758 cvm[3502]: at com.amazon.ebook.booklet.reader.yb.start(qm:953)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.a(nk:27)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.A(nk:420)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.b(nk:163)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.s.a(nk:214)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.f.a(tec:416)
111115:154758 cvm[3502]: at com.amazon.ebook.framework.impl.e.run(tec:13)
111115:154758 cvm[3502]: at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:152)
111115:154758 cvm[3502]: at java.awt.EventQueue.dispatchEvent(EventQueue.java: 371)
111115:154758 cvm[3502]: at java.awt.EventQueueProxy.dispatchEvent(Compiled Method)(EventDispatchThread.java:351)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.pumpOneEvent(Compiled Method)(EventDispatchThread.java:164)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:154)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:149)
111115:154758 cvm[3502]: at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:134)
111115:154758 cvm[3502]: at java.lang.Thread.startup(Thread.java:1065)
111115:154758 cvm[3502]:
111115:154758 cvm[3502]: I AlertImpl:PostingAlert:msg=This PDF cannot be opened due to embedded features not yet supported by Kindle.:
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Old 11-15-2011, 09:18 PM   #68
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Hello, guys.

I could try to be of some help if you could just tell me how to ssh/read files/do whatever with kindle from my desktop.
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Old 11-15-2011, 09:58 PM   #69
yifanlu
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Quote:
Originally Posted by wsp View Post
Hello, guys.

I could try to be of some help if you could just tell me how to ssh/read files/do whatever with kindle from my desktop.
Lol, if we can do that, we don't need to jailbreak.
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Old 11-16-2011, 05:47 AM   #70
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Thanks, yifanlu, for you effort! I'm very interested in jailbreak for Kindle 4...

Do you have a manual how to connect to it through the serial port? Some time ago I tried to find a root hack for my PocketBook 301+, but without success Probably I'll buy Kindle 4 for jailbreaking

Last edited by sergeyvl12; 11-16-2011 at 05:50 AM.
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Old 11-17-2011, 12:18 AM   #71
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Hello

Hi all,

Just purchased 2 of these devices, and love the hardware & platform concept, but greatly object/dislike the enforced advertising content.

I've had a read through this thread, and while I don't have the technical skills to push this project forward, I will do my best to offer constructive comments on potential lines of attack.

My thanks to Lifanyu & other contributors for your efforts, and more importantly, your commentary & instructions. Your generosity in sharing the results of your efforts is appreciated, by more than just myself, I'm sure.

Cheers,
'Kat
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Old 11-17-2011, 12:20 AM   #72
yifanlu
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I'm going to throw some ideas around about a kindle packaging system. I have two problems with kindle hacks. First, install and uninstalling hacks are messy. Install scripts could modify any files and there isn't a system of where data/binaries should be stored. Also, it's hard to keep up with all the installers/uninstallers and versionings. And using kindle's update system could seem confusing to new users as they think they're upgrading. The second problem is we don't have a nice, GUI, launcher. I'm thinking of using the debian packaging system, but I don't want to modify rootfs if I could prevent it. I was thinking of a custom package structure where to install an app, you copy a folder to the "packages" folder on the kindle or something. In that folder will be an startup script, a shutdown script, a run on demand script, and stop on demand script (optional). It would also contain it's own data in that folder. We only install one startup script to the kindle when jail breaking and that script loads all hacks on startup. To uninstall, just delete the folder for the package. And second, someone (maybe me) could write an app launcher that is activated by a shortcut key or gesture.

The package structure could be like:
USB Root
->packages
-->ssh
--->startup.sh
--->shutdown.sh
--->run.sh
--->stop.sh
--->bin
---->dropbear
--->etc
---->dropbear.conf
-->screensaver
--->startup.sh
--->images
---->image1.png
---->image2.png

And so on.

Can developers give some feedback about this?

Last edited by yifanlu; 11-17-2011 at 12:22 AM.
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Old 11-17-2011, 12:45 AM   #73
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Quote:
Originally Posted by tesserkat View Post
Hi all,

Just purchased 2 of these devices, and love the hardware & platform concept, but greatly object/dislike the enforced advertising content.
The advertising is not "enforced." You can remove the ads by repaying the $30 subsidy Amazon gave you on the first device. http://www.mobileread.com/forums/sho...d.php?t=152428

Last edited by aquariumdrinker; 11-17-2011 at 12:47 AM. Reason: URL correction
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Old 11-17-2011, 06:55 AM   #74
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Quote:
Originally Posted by yifanlu View Post
I'm going to throw some ideas around about a kindle packaging system. I have two problems with kindle hacks. First, install and uninstalling hacks are messy. Install scripts could modify any files and there isn't a system of where data/binaries should be stored. Also, it's hard to keep up with all the installers/uninstallers and versionings. And using kindle's update system could seem confusing to new users as they think they're upgrading. The second problem is we don't have a nice, GUI, launcher. I'm thinking of using the debian packaging system, but I don't want to modify rootfs if I could prevent it. I was thinking of a custom package structure where to install an app, you copy a folder to the "packages" folder on the kindle or something. In that folder will be an startup script, a shutdown script, a run on demand script, and stop on demand script (optional). It would also contain it's own data in that folder. We only install one startup script to the kindle when jail breaking and that script loads all hacks on startup. To uninstall, just delete the folder for the package. And second, someone (maybe me) could write an app launcher that is activated by a shortcut key or gesture.

The package structure could be like:
USB Root
->packages
-->ssh
--->startup.sh
--->shutdown.sh
--->run.sh
--->stop.sh
--->bin
---->dropbear
--->etc
---->dropbear.conf
-->screensaver
--->startup.sh
--->images
---->image1.png
---->image2.png

And so on.

Can developers give some feedback about this?
This is exactly what I'm thinking of now. My idea is about doing it manually.

So why doesn't a preset package management system fit Kindle? It's simply too heavy to maintain. As you said, rootfs is useless. While gentoo-prefix won't bother you with rootfs, it is unacceptable in size (20x in size of general kindle apps).

A PMS is actually a tool chain about filesystem tree layout, with versioning tools like git/hg/svn included. The trick is to proceed metadata well and keep files organized. Am I going to run, say `apt get update` on my kindle? I don't think so. The most frequent senario is to connect kindle with pc then sync with, what you said, a GUI application.

Since executing commands from kindle is unnecessary, why not consider kindle as an output directory? Thus the problem becomes, that we need a PMS on pc only and kindle is just a local branch. Every install/uninstall/upgrade/reverse operation can be seen as one synchronisation with local repos.

An invisible advantage will be, that library management can be integrated into this sync tool flawlessly.

About the launcher, an official implementation (the one shipped with jailbreak package) is preferable. This concerns usability and only in this way can you control the init/halt of kindle apps. You can make some rules before a 3rd app can be listed in your launcher, for example, config file location etc. I'm not talking about auditing, but I do consider double-way user-friendly design between jailbreakers and app-developers.

In my design, a slim version of PMS just has to do something right,
1. filesystem layout, I totally agree with you about filesystem layout. Technically it is done by adding a global $PREFIX="/packages/" in scripts.
2. dependency, I don't know if it matters as most kindle apps are independent.
3. versioning, a simple cut/copy/paste works well I think, especially when configurations are preserved in separate directories.

In summary, I imagine this PMS for kindle to be mainly an application on pc. If it is written by c/python, it's probably naturally cross platformed.

Here is a link to gentoo's pms specifications if you are interested.
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Old 11-17-2011, 04:09 PM   #75
babkayaga
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babkayaga began at the beginning.
 
Posts: 6
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Join Date: Sep 2011
Device: sony prs
Quote:
Originally Posted by yifanlu View Post
Ok, a tiny progress. I've found a way to access/read most files on the Kindle. However, I can't pass arguments. So it's basically useless. However, if we didn't have a NAND dump, it would have been useful.
Sounds interesting, could you share how it's done?
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