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CVE-2020-9856

Status Candidate

Overview

This issue was addressed with improved checks. This issue is fixed in macOS Catalina 10.15.5. An application may be able to gain elevated privileges.

Related Files

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
SHA-256 | fbbde1e0b4f53036aee6e135d84e5add073f53c612d6996cee132e6170926d16
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