Android aware: This brand new type of rowhammer GPU assault can hijack your phone remotely
Video: switch your Android os smartphone into a bunker with 10 easy steps.
The attack reduces the club to pulling down alleged rowhammer attacks that flip bits in actual memory to ram through in-built protection defenses.
The scientists note that many defenses against rowhammer assaults have focused on safeguarding CPU cores, and program that GPUs being integrated with CPUs — common on mobile system on potato chips — are another attack opportunity.
“We display the possibility of such attacks by bypassing advanced web browser defenses and providing initial trustworthy GPU-based rowhammer attack that compromises a web browser on a phone in under two minutes,” the researchers from Vrije Universiteit in Amsterdam write in a fresh paper.
A-year after rowhammer attacks were initially reported in 2014, researchers at Google venture Zero received awareness of weaknesses impacting lots of x86 laptop computers making use of little bit flips in DRAM to escalate privileges.
The rowhammer problem is the result of shrinking DRAM cells, that has managed to get harder to separate memory within one target from corrupting information stored in another.
The work demonstrated that repeated toggling of a DRAM row’s wordline — rowhammering — “stresses inter-cell coupling effects that accelerate charge leakage from nearby rows”, leading to ‘bit flips’ in which a cell’s price modifications from 1 to 0 or vice versa.
As noted by Carnegie Mellon University’s CERT, the GLitch attack is made up of two parts: a side-channel to look for the design of real memory target room; and a rowhammer assault that targets the look of DRAM memory.
The two attacks are after that with the WebGL application development screen (API), used for rendering web photos in browsers. It also relies on web browser support for accuracy WebGL timers, which permit the side-channel to drip memory addresses.
At the same time, the GPU permits “fast double-sided DRAM access, allowing the rowhammer attack”.
The scientists revealed that it was possible to make use of the way to sidestep the Firefox sandbox on Android os.
“The precise timing abilities given by WebGL can allow an assailant to look for the difference between cached DRAM accesses and uncached DRAM accesses,” explained CERT scientists Will Dormann and Trent Novelly.
“this could enable an attacker to determine contiguous regions of physical DRAM memory. Familiarity with contiguous memory areas can be used in a number of microarchitectural assaults, like rowhammer.”
Precision timers have now been disabled in Chrome and Firefox on Android to mitigate the assaults.
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Posted at Fri, 04 might 2018 13:23:00 +0000