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Files from Istvan Kurucsai

First Active2019-04-04
Last Active2020-03-05
Google Chrome 72 / 73 Array.map Corruption
Posted Mar 5, 2020
Authored by timwr, Istvan Kurucsai, dmxcsnsbh | Site metasploit.com

This Metasploit module exploits an issue in Chrome version 73.0.3683.86 (64 bit). The exploit corrupts the length of a float in order to modify the backing store of a typed array. The typed array can then be used to read and write arbitrary memory. The exploit then uses WebAssembly in order to allocate a region of RWX memory, which is then replaced with the payload. The payload is executed within the sandboxed renderer process, so the browser must be run with the --no-sandbox option for the payload to work correctly.

tags | exploit, arbitrary
advisories | CVE-2019-5825
MD5 | 2d254d561447d584fca1cf0562293577
Google Chrome 80 JSCreate Side-Effect Type Confusion
Posted Mar 5, 2020
Authored by Clement LECIGNE, timwr, Istvan Kurucsai, Vignesh S Rao | Site metasploit.com

This Metasploit module exploits an issue in Google Chrome version 80.0.3987.87 (64 bit). The exploit corrupts the length of a float array (float_rel), which can then be used for out of bounds read and write on adjacent memory. The relative read and write is then used to modify a UInt64Array (uint64_aarw) which is used for read and writing from absolute memory. The exploit then uses WebAssembly in order to allocate a region of RWX memory, which is then replaced with the payload shellcode. The payload is executed within the sandboxed renderer process, so the browser must be run with the --no-sandbox option for the payload to work correctly.

tags | exploit, shellcode
advisories | CVE-2020-6418
MD5 | 2477d57f77b12b3980be7a18ed9dedf2
Chrome 72.0.3626.119 FileReader Use-After-Free
Posted May 8, 2019
Authored by Clement LECIGNE, timwr, Istvan Kurucsai | Site metasploit.com

This exploit takes advantage of a use after free vulnerability in Google Chrome 72.0.3626.119 running on Windows 7 x86. The FileReader.readAsArrayBuffer function can return multiple references to the same ArrayBuffer object, which can be freed and overwritten with sprayed objects. The dangling ArrayBuffer reference can be used to access the sprayed objects, allowing arbitrary memory access from Javascript. This is used to write and execute shellcode in a WebAssembly object. The shellcode is executed within the Chrome sandbox, so you must explicitly disable the sandbox for the payload to be successful.

tags | exploit, arbitrary, x86, javascript, shellcode
systems | windows, 7
advisories | CVE-2019-5786
MD5 | 1845174659a656cb293c5dd2f17fe75c
Chrome 73.0.3683.86 Stable Proof Of Concept
Posted Apr 4, 2019
Authored by Istvan Kurucsai

Chrome version 73.0.3683.86 stable exploit for chromium issue 941743, tested on Windows 10 x64, which leverages a flaw in the V8 javascript engine.

tags | exploit, javascript
systems | windows
MD5 | 3942490d2a3c9f4e77eb820e2de2a909
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