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A headline feature introduced in the latest release of Windows 11, 25H2 is Administrator Protection. The goal of this feature is to replace User Account Control (UAC) with a more robust and importantly, securable system to allow a local user to access administrator privileges only when necessary. This blog post will give a brief overview of the new feature, how it works and how it’s different from UAC. I’ll then describe some of the security research I undertook while it was in the insider preview builds on Windows 11. Finally I’ll detail one of the nine separate vulnerabilities that I found to bypass the feature to silently gain full administrator privileges. All the issues that I reported to Microsoft have been fixed, either prior to the feature being officially released (in optional update KB5067036) or as subsequent security bulletins. Note: As of 1st December 2025 the Administrator Protection feature has been disabled by Microsoft while an application compatibility issue is dealt with. The issue is unlikely to be related to anything described in this blog post so the analysis doesn’t change.

While our previous two blog posts provided technical recommendations for increasing the effort required by attackers to develop 0-click exploit chains, our experience finding, reporting and exploiting these vulnerabilities highlighted some broader issues in the Android ecosystem. This post describes the problems we encountered and recommendations for improvement. Audio Attack Surface The Dolby UDC is part of the 0-click attack surface of most Android devices because of audio transcription in the Google Messages application. Incoming audio messages are transcribed before a user interacts with the message. On Pixel 9, a second process com.google.android.tts also decodes incoming audio. Its purpose is not completely clear, but it seems to be related to making incoming messages searchable.

With the advent of a potential Dolby Unified Decoder RCE exploit, it seemed prudent to see what kind of Linux kernel drivers might be accessible from the resulting userland context, the mediacodec context. As per the AOSP documentation, the mediacodec SELinux context is intended to be a constrained (a.k.a sandboxed) context where non-secure software decoders are utilized. Nevertheless, using my DriverCartographer tool, I discovered an interesting device driver, /dev/bigwave that was accessible from the mediacodec SELinux context. BigWave is hardware present on the Pixel SOC that accelerates AV1 decoding tasks, which explains why it is accessible from the mediacodec context. As previous research has copiously affirmed, Android drivers for hardware devices are prime places to find powerful local privilege escalation bugs. The BigWave driver was no exception - across a couple hours of auditing the code, I discovered three separate bugs, including one that was powerful enough to escape the mediacodec sandbox and get kernel arbitrary read/write on the Pixel 9.

Over the past few years, several AI-powered features have been added to mobile phones that allow users to better search and understand their messages. One effect of this change is increased 0-click attack surface, as efficient analysis often requires message media to be decoded before the message is opened by the user. One such feature is audio transcription. Incoming SMS and RCS audio attachments received by Google Messages are now automatically decoded with no user interaction. As a result, audio decoders are now in the 0-click attack surface of most Android phones. I’ve spent a fair bit of time investigating these decoders, first reporting CVE-2025-49415 in the Monkey’s Audio codec on Samsung devices. Based on this research, the team reviewed the Dolby Unified Decoder, and Ivan Fratric and I reported CVE-2025-54957. This vulnerability is likely in the 0-click attack surface of most Android devices in use today. In parallel, Seth Jenkins investigated a driver accessible from the sandbox the decoder runs in on a Pixel 9, and reported CVE-2025-36934.

1. Mở đầu Bài viết này là phần mô tả sơ lược và bình luận bài báo "Spoiled Onions: Exposing Malicious Tor Exit Relays"[1]. Tor exit relay là nút cuối dùng trong hành trình vận chuyển của các gói tin trọng mạng Tor, gói tin từ đây sẽ đi đến địa chỉ ...

Nhaccuatui vừa nâng cấp trình chơi nhạc trên web của mình có thể hiển thị lời nhạc theo thời gian khá tốt. Bài viết này sẽ trình bày các bước để lấy lời nhạc đó và cung cấp một công cụ để thực hiện trong 1 cú enter ;) (*). Lấy ...

Challenge was getting 0x1000 bytes from socket, and executing it following these rules (all shellcodes and codes are at the end of this writeup): [code] - all general purpose registers are 0 - stack is at 0x42000000 - pc    is at 0x41000000 [/code] All binaries: x86 : polyglot_9d64fa98df6ee55e1a5baf0a170d3367 armel : polyglot_6a3875ce36a55889427542903cd43893 armeb : polyglot_c0e7a26d7ce539efbecc970c154de844 PowerPC: polyglot_5b78585342a3c116aebb5a9b45e88836 Our shellcode ...

Lưu ý: các phân tích trong bài viết này được dựa trên phiên bản Btalk 1.0.6 tải về từ PlayStore. Các vấn đề được nêu trong bài viết này BKAV đã được gửi email thông báo từ trước. (pdah - cb_ - k9) Cơ chế đăng ký và kích hoạt Quá trình xác ...

In previous post, we analyzed and exploited stack based buffer overflow vulnerability in chunked encoding parsing of nginx-1.3.9 - 1.4.0. We mentioned that there was another attack vector which was more practical, more reliable. I talked about this attack vector at SECUINSIDE 2013 in July (btw, a great conference and ...

Challenge itself is very interesting, as we have typical use-after-free problem. It's running on Ubuntu 13.04 with NX + ASLR. When we run challenge it gives us message as : [code] ###################################### #                                    # #   Welcome to the movie talk show   # #                                    # ###################################### 1. movie addition 2. movie deletion 3. my movie list 4. quit : [/code] movie addition is very straight ...

Description: http://war.secuinside.com/files/reader ip : 59.9.131.155 port : 8282 (SSH) account : guest / guest We have obtained a program designed for giving orders to criminals. Our investigators haven't yet analyzed the file format this program reads. Please help us analyze the file format this program uses, find a vulnerability, and take a shell. From the description we can ...

Challenge summary: Binary : http://war.secuinside.com/files/pwnme Source : http://war.secuinside.com/files/pwnme.c =================================== OS : Ubuntu 13.04 with PIE+ASLR+NX md5 of libc-2.17.so : 45be45152ad28841ddabc5c875f8e6e4 IP : 54.214.248.68 PORT : 8181,8282,8383 This is the only exploit challenge comes with source. The bug is simple: buffer overflow with only 16-bytes at pwnme.c:67, just enough to control EIP. The goal is to bypass PIE+ASLR+NX. We ...

Description: IP : 59.9.131.155 port : 18562 (SSH) account :  control  / control porsche binary : http://war.secuinside.com/files/firmware data : http://war.secuinside.com/files/car.bin (To prevent meaningless waste of time on certain analysis, car.bin is open to public.) hint : root@ubuntu:~# uname -a Linux ubuntu 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:19:42 UTC 2013 i686 i686 i686 GNU/Linux The evil group is running ...

A few days after the release of nginx advisory (CVE-2013-2028), we managed to successfully exploit the vulnerability with a full control over the program flow. However, in order to make it more reliable and useful in real world environment, we still explored several program paths and found some other ...

Latest M$ tuesday patch kill one of my 0day in Microsoft Internet Explorer 9/10. So I decided release Proof Of Concept code and writeup some analyze about this bug. Hope it helpful. Here is the PoC: [sourcecode language="html"] ...

Nhận lời mời từ IDG, VNSecurity đồng ý đứng ra phối hợp tổ chức cuộc thi "Snatching the h@t" như một sự kiện trong khuôn khổ hội thảo CSO Asean năm 2012 với mong muốn giới thiệu và phát triển CTF như một hình thức học tập và thể hiện ...

The famous zombie researcher “Donn Beach” almost created an immunization against the dipsomanie virus. This severe disease leads to the inability to defend against Zombies, later causes a complete loss of memory and finally turns you into one of them. Inexplicably Donn forgot where he put the license key for his centrifuge. Provide him ...

I did not solve this during CTF and my mistake is not using IDA to decompile since it has some obfuscate. After CTF end, i use gdb to dump running process to binary file and analyze it again, try to finish it. gdb --pid [PID] gdb>info proc process 4660 gdb>shell cat /proc/4660/maps 08048000-0804a000 rwxp 00000000 08:03 7213513 gdb>dump ...

19 - Zombie Reminder Zombies love brains. But zombies forget, so they have a tool where they can enter the location of brains they found. In a heroic mission someone managed to obtain both the source code and the information that a critical file can be found at '/var/www/flag'. Your mission ...