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CVE-2020-27786 is a use-after-free vulnerability in the Linux kernel MIDI implementation. A local user permitted to issue ioctl commands to MIDI devices can trigger freeing of an object and subsequently write to the freed memory before it is reused. This can alter control flow and cause memory corruption.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a local privilege escalation exploit for CVE-2020-27786, a use-after-free vulnerability in the ALSA rawmidi driver in the Linux kernel. The main exploit logic is implemented in two C files: 'exploit.c' (for systems with SMEP/SMAP) and 'exploit_nosmap.c' (for systems without SMAP). Both files orchestrate a complex attack involving userfaultfd, heap spraying, and manipulation of ALSA rawmidi device objects to achieve arbitrary code execution in kernel space. The payload is a root shell spawned via /bin/sh. The 'init' shell script sets up a minimal Linux environment, and 'start.sh' launches a QEMU virtual machine with the appropriate kernel and initramfs for testing the exploit. The exploit targets the device file /dev/snd/midiC0D0 and uses /dev/ptmx for heap spraying. The repository is operational and provides a working exploit for local privilege escalation on vulnerable Linux systems.
This repository contains a local privilege escalation exploit for CVE-2020-27786, a race condition in the Linux kernel's raw MIDI subsystem that leads to a write use-after-free. The exploit leverages userfaultfd to extend the race window and msg_msg to leak a kernel address, ultimately obtaining a write-what-where primitive. It overwrites the global kernel variable modprobe_path to point to a user-controlled script (e.g., /tmp/x), then triggers modprobe to execute this script as root, resulting in a root shell. The main exploit logic is implemented in 'exploit.c', which is a standalone C program. The exploit requires local access to the target system, access to /dev/snd/midiC0D0, and a vulnerable kernel. The README provides a high-level overview and a link to a detailed write-up. No network endpoints are involved; the attack vector is purely local. The repository is operational, providing a working exploit and payload for privilege escalation.
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Linux kernel use-after-free vulnerability in the MIDI subsystem.
Use-after-free vulnerability in the Linux kernel MIDI subsystem.
Linux kernel use-after-free vulnerability in the MIDI subsystem.
Linux kernel use-after-free vulnerability in the MIDI subsystem.
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