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Files from Taesoo Kim

Email addresstaesoo at gatech.edu
First Active2020-09-07
Last Active2020-10-01
Safari Type Confusion / Sandbox Escape
Posted Oct 1, 2020
Authored by timwr, Insu Yun, Taesoo Kim, Jungwon Lim, Yonghwi Jin | Site metasploit.com

This Metasploit module exploits an incorrect side-effect modeling of the 'in' operator. The DFG compiler assumes that the 'in' operator is side-effect free, however the embed element with the PDF plugin provides a callback that can trigger side-effects leading to type confusion (CVE-2020-9850). The type confusion can be used as addrof and fakeobj primitives that then lead to arbitrary read/write of memory. These primitives allow us to write shellcode into a JIT region (RWX memory) containing the next stage of the exploit. The next stage uses CVE-2020-9856 to exploit a heap overflow in CVM Server, and extracts a macOS application containing our payload into /var/db/CVMS. The payload can then be opened with CVE-2020-9801, executing the payload as a user but without sandbox restrictions.

tags | exploit, overflow, arbitrary, shellcode
advisories | CVE-2020-9801, CVE-2020-9850, CVE-2020-9856
MD5 | 2dc9b201150ea12e09390643b437b269
macOS cfprefsd Arbitrary File Write / Local Privilege Escalation
Posted Sep 7, 2020
Authored by timwr, Insu Yun, Taesoo Kim, Jungwon Lim, Yonghwi Jin | Site metasploit.com

This Metasploit module exploits an arbitrary file write in cfprefsd on macOS versions 10.15.4 and below in order to run a payload as root. The CFPreferencesSetAppValue function, which is reachable from most unsandboxed processes, can be exploited with a race condition in order to overwrite an arbitrary file as root. By overwriting /etc/pam.d/login a user can then login as root with the login root command without a password.

tags | exploit, arbitrary, root
advisories | CVE-2020-9839
MD5 | 5bc27419d79ae20808b9b53825a1e970
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