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Created: Saturday, July 24 2010 06:23.54 CDT

Modified: Saturday, July 31 2010 05:41.04 CDT

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Dr. Gadget IDAPython plugin

Author: dennis

# Views: 18721

Hi,

I wanted to share with you this little IDAPython plugin which helps in writing and analyzing return oriented payload. It uses IDA's custom viewers in order to display an array of DWORDs called 'items', where an item can be either a pointer to a gadget or a simple 'value'.
There are several keyboard shortcuts to access functionality that otherwise also is accessible via the context menu:

ESC   - closes the plugin
ENTER - jumps to item address in disassembly
O     - toggles item type (offset, value)
D     - deletes an item
I     - inserts an item
E     - edits an item's value

Functionality that is accessible via context menu only:

Load payload     - loads a payload from disk
Save payload     - saves a payload to disk

Auto analysis I  - tries to determine each item's type (offset, value)
Reset            - resets each item's type
Show disassembly - opens a disassembly subwindow

Below screenshots show the plugin's interface. The IDB is a disassembly
of 'BIB.dll' (MD5: 2ec16a4cdb828a31a432513a82cbafdf). _rop.bin is some
exploit's payload in binary form (more info:
http://blog.zynamics.com/2010/06/09/analyzing-the-currently-exploited-0-day-for-adobe-reader-and-adobe-flash/)

The plugin can be used either on a static disassembly or during an IDA debugging session.

The plugin is available here: http://www.openrce.org/repositories/users/dennis/drgadget.py
_rop.bin is available here: http://www.openrce.org/repositories/users/dennis/rop.bin

edit:
just uploaded v0.2 which adds Elias Bachaalany's "find instruction/opcode" script from
http://hexblog.com/2009/09/assembling_and_finding_instruc.html

Blog Comments

dennis

Posted: Thursday, August 26 2010 02:49.19 CDT

new version 0.3 uploaded, introducing following changes:

- bugfixes
- added ARM support
- primitive stack/pc tracing for ARM
- Disassembly view export to file
- string reference scanning in disasm view
- add support for comments both in rop view and disasm view in sync
- sync offset number display between ropview and disasm

screenshot below shows stage 2 of the ROP code of the http://www.jailbreakme.com/ exploit.

code is available here

all changes courtesy of Karthik (neox.fx at gmail dot com)

dennis	Posted: Wednesday, September 12 2012 06:11.12 CDT
Dr. Gadget has just been updated due to a bugfix (thanks Ivanlef0u). The project is now available on github (https://github.com/patois/DrGadget) and licensed under the Beerware license ;-)

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