• Analysis of DirectComposition Binding and Tracker object vulnerability

    DirectComposition introduction Microsoft DirectComposition is a Windows component that enables high-performance bitmap composition with transforms, effects, and animations. Application developers can use the DirectComposition API to create visually engaging user interfaces that feature rich and fluid animated transitions from one visual to another.[1]

  • Analysis of Chromium issue 1196683, 1195777

    On April 12, a code commit[1] in Chromium get people’s attention. This is a bugfix for some vulnerability in Chromium Javascript engine v8. At the same time, the regression test case regress-1196683.js for this bugfix was also submitted. Based on this regression test case, some security researcher published an exploit sample[2]. Due to Chrome release pipeline, the vulnerability wasn’t been fixed in Chrome stable update until April 13[3].

  • Exploiting Windows RPC to bypass CFG mitigation: analysis of CVE-2021-26411 in-the-wild sample

    The general method of browser render process exploit is: after exploiting the vulnerability to obtain user mode arbitrary memory read/write primitive, the vtable of DOM/js object is tampered to hijack the code execution flow. Then VirtualProtect is called by ROP chain to modify the shellcode memory to PAGE_EXECUTE_READWRITE, and the code execution flow is jumped to shellcode by ROP chain finally. After Windows 8.1, Microsoft introduced CFG (Control Flow Guard)[1] mitigation to verify the indirect function call, which mitigates the exploitation of tampering with vtable to get code execution.

  • CVE-2021-1732: win32kfull xxxCreateWindowEx callback out-of-bounds

    CVE-2021-1732 is a 0-Day vulnerability exploited by the BITTER APT organization in one operation which was disclosed in February this year[1][2][3]. This vulnerability exploits a user mode callback opportunity in win32kfull module to break the normal execution flow and set the error flag of window object (tagWND) extra data, which results in kernel-space out-of-bounds memory access violation.

  • CVE-2021-26411: Internet Explorer mshtml use-after-free

    In January of this year, Google and Microsoft respectively published blogs revealing attacks on security researchers by an APT group from NK[1][2]. A vulnerability in Internet Explorer used in this attack was fixed as CVE-2021-26411 in Microsoft’s Patch Tuesday this month[3]. The vulnerability is triggered when users of the affected version of Internet Explorer access a malicious link constructed by attackers, causing remote code execution.
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