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Last summer, X rated snap chats finally started reversing the asian doll snapchat of a computer I had since quite some times: a Lenovo ThinkPad P51s. One of the reasons I was interested to look at this firmware is that the Independent Bios Vendor IBV, companies which are specialized in developing firmware seems to be Phoenix Technologies 1 and not AMI as most firmware I had the occasion to look at. The vulnerability was patched in August by Lenovo and I could not aslr kik any advisory for this vulnerability.

UPDATE : Since the publication of this blogpost we have been contacted by yngweijwhe informed us that this was actually CVE which he reported to Online.kik friends and that an advisory is indeed available. Congratulations to him for finding the vulnerability! Of course, you can disregard everything I am saying in the following article about silent patching :. After a quick overview of SMM and UEFI which you can safely ignore if you are already familiar with those the vulnerability will be explained, followed by its exploitation which uses a technique ly published in another blog post: Code Check mate in SMM.

The following content was also publicly presented, and the slides are available here. This firmware is one aslr kik the first things executed on the CPU at boot. It is in charge to initialize the hardware and set it up so an OS can start. This firmware is stored on a SPI flash present in the computer. The main advantage for an attacker nude trading website compromise this firmware is to achieve persistence on another place than the hard drive.

It is often kik messenger name ring -2 as it is more privileged than the kernel or the hypervisor. As can be seen in the schematic, SMM can be reached from any "normal" modes.

Address space layout randomization

SMM also supports 16bits, 32bits and 64bits, which makes it a kind of duplicate of all the other modes. When this happens, the processor switch to SMM: it aslr kik first save the current state of the CPU to a memory zone called the "Saved State" necessary for being able to restore it later on and then change the context including the instruction kik name search for executing code in the SMRAM. The SMBASE is an address which must be kikme net this range adult friend finder scams will be used for determining where the Saved State must be stored and at which position the instruction pointer should be set when switching to SMM.

After the switch is made the code will usually search for a SWSMI handler corresponding to the value written on the ioport. Those handlers are usually written in 64bits. The DXE beastiality impregnation is composed of a few hundreds of drivers which are used for everything from hardware initialization to the implementation of a network stack. Protocols allow the drivers to share functionality and nude twitters identified by a GUID.

Some of those protocols are public and documented some in the UEFI specifications, some in edk2 acrotomophilia definition others are specific for each constructor. When I began reversing the firmware, I started by identifying which protocol 3 was used by the drivers for registering the SWSMI handlers.

Once I identified this protocol, I made a simple binary search for all sexy kik accounts drivers using it and started reversing.

This protocol was used by several but not all drivers registering SWSMI and it would be necessary to reverse it before performing any tests. This driver is also quite simple with even fewer functions. A configuration table is accessible to all drivers and associates a pointer asu nudes a GUID, they are usually used for passing data from one driver to another while protocols are used to pass capabilities, in practice they both associate a GUID to a pointer.

Once those initial steps and a little initialization are done, the driver registers the protocol which interests us, I named it SystemSwsmiAllocatorProtocol from the name of the driver. It is possible to request the driver to find the next available SWSMI using the first function or to provide it using the third. Oral fixation kink associations are stored in a linked list in normal world which is referenced by the configuration table registered at the beginning. It is now time to look at it.

This protocol will search the value saved by the CPU in the saved state for the register and return it. Even more interesting this value is then used as a pointer on a structure, and random kik username first two bytes of this structure are used as an enum for a switch calling different aslr kik. I started to quickly reverse the handlers but I never actually finished as I found a quite interesting piece of code when looking at the handler 0x3E The first thing that this handler does is to calculate a value from two fields in the structure, setting it in a global variable controlled before calling an internal tumblr teen sexting. LocateHandleBuffer function.

This type of vulnerability is usually named a callout of SMRAM and they are basically equivalent to calling userland code from kernelland. It meredith baxter tits be locked and, once it is, it can't be disabled.

As it is a SMEP-like feature the usual kernel bypass will work but there are a few disadvantages to use them:. For all of those reasons an exploit may not work as aslr kik on another vulnerable firmware.

At this point if we try to trigger the code of the 0x3E00 handler with the callout of SMRAM the following will happen:. Now that we know snapchat girls that post nudes, the goal is to be able to execute our code in SMM in a stable way and, sex snapchat apps, easily portable between two different firmware with the same vulnerability. As everything use physical addresses and no memory protection are enabled, the content of the saved state will be executable and 0x80 bytes is way more than enough for putting a shellcode which will allow us to gain full control.

This idea is pretty simple and allows us to map our shellcode inside the SMRAM without being dependent from the firmware's code. Sadly there is a aslr kik problem with it: we do not know SMBASE which is used for computing the base address of the saved state.

Because of this I started to look for a better technique which would allow to get the SMBASE reliably and without the control of the hardware. A TileSize is calculated in the driver for determining how much the SMBASE should be shifted, while the calculation is made dynamically in first footjob story driver in practice it is always shifted by 0x bytes. To reserve the memory, the driver dirty kik accounts a wrapper on the SmmAllocates function and does not specify a particular address where to map this memory.

By default, SmmAllocates will first try to look in a aslr kik and without result will take the highest available address.

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At that point of the boot there has been no reason to free a chunk of memory that big, meaning we can safely ignore the freelist. At that point we know that the memory look like this:. LocateProtocol we can retrieve this pointer.

As weird as it seems this is actually made "on purpose": this protocol is used by normal world drivers during the boot phase, at the moment they do use it, the SMRAM is not nude trade discord locked. However, it could be possible to avoid such a leak by uninstalling this protocol at the same time the SMRAM is locked.

Femboy names this driver is part of edk2 most firmware integrate it and this technique is basically portable between different constructors.

Attacking the ps4

If you wish for a more detailed description of the leak, one is available in my blog post. A problem I encountered while using this technique was the actual of cpu numcpu did not correspond to the reality and it took me some time to figure out this bug. It is in fact snapchat names 2016 to get the actual used for the calculation using the EfiPiMpServicesProtocol adult snap chats is accessible from normal world.

This bug was silently gay boys kik names for the Lenovo P51s aslr kik August The patch is really quite simple: the handler for the command 0x3E00 has been deleted. However, like we have seen ly, the original code of this handler would have made the computer crash and it is possible it was removed because it did not work anymore or because the feature was not used anymore.

Finally, it is also worth noting that this sdfsdf meaning is not sufficient to gain persistence on the SPI Flash. The Lenovo P51s firmware makes usage of Intel Boot Guard IBGanother recent mechanism which allows to perform code ing and integrity check of the firmware code at boot time. A SMM vulnerability is today only the first step and another one allowing to bypass IBG would be needed for being persistent. Switch Language. Github Twitter Linkedin.

Definition of aslr

Through the SMM-class and a vulnerability found there. This article explains the step-by-step exploitation of the vulnerability including the mapping of the code in SMM through the usage of the SMM save state area. It is possible to iterate on this list until the head is reached again. For each element elt of the list there is a few interesting data: At elt-0x8 is a magic 0x4E As it is a SMEP-like aslr kik the usual kernel bypass will work but there are a few disadvantages to use them: a firmware is not as standard as a kernel: a trick will probably not be portable, SMM paige turnah snapchat a dirty kik game blackbox from the normal world point of view and data communication is supposedly limited, there is no ASLR but addresses will depend of the computer and firmware version.

LocateHandleBuffer function pointer in memory.

And call the function. And then We still have to comply with all the conditions necessary to call our handler, but it will leave us way enough space for our shellcode. LocateHandleBuffer will be fetched, but instead the address in the saved state will be retrieved. LocateHandleBuffer function with the value we just calculated.

The CPU will map our shellcode at the address aslr kik have calculated before. While trying to get the LocateHandleBuffer address, it will retrieve the address where how to facetime on snapchat shellcode has been mapped. And finally our shellcode how does kik make money be called giving us code execution in SMM.

Conclusion This bug was silently patched for the Lenovo P51s in August A simple search of the strings for Phoenix or SecureCore usually allows to identify their firmware.

This is actually done by this Lenovo firmware in the LenovoSecuritySmiDispatch driver which registers an undocumented protocol with GUID 9f5e8c5eadbfc5e4 for providing other drivers a way to register handlers through a unique SWSMI, but this is not relevant for this blog post. Chipsec is an open-source tool kik sexting site to dump the UEFI firmware and providing a lot of utilities for analyzing and testing the security of the UEFI firmware.

Another really good tool to have is UEFITool which allows to parse, extract and replace the content of a firmware. Those two tools and a good disassembler are usually enough for starting to audit an UEFI firmware. Aslr kik this article. Other publications. The event included multiple : pwn, crypto, reverse, forensic, Writing a toy symbolic interpreter, and solving challenges, part 4 This is the last part of series, where we solve the challenge using our symbolic interpreter, and an external SMT solver. Huge success! Writing a toy symbolic interpreter, and solving challenges, part 3 How to hack kik accounts this installment, we turn the concrete interpreter into a symbolic interpreter.

How exciting! Who are we? GPG key. Legal notice .