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A vulnerability in PolicyKit (polkit) before version 0.113 allows local users to trigger memory corruption and crash the polkitd daemon, and possibly escalate privileges. The flaw is related to the evaluation of JavaScript rules within PolicyKit, though the specific attack vectors are not detailed in the available information.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a small, legitimate proof-of-concept for CVE-2015-3456 (VENOM) focused on reproducibly crashing vulnerable QEMU rather than escaping the VM or achieving host code execution. The core exploit is src/venom-crash.c, a guest-side C program that requests direct I/O access with ioperm(), writes the FDC READ_ID command (0x0a) to floppy controller data port 0x3f5, and then continuously floods that same port with byte 0x42. Its purpose is to drive the vulnerable floppy disk controller emulation code path until the host-side QEMU process crashes, producing a denial of service. Repository structure is straightforward: src/venom-crash.c contains the PoC; scripts/run-alpine.sh launches a vulnerable QEMU lab instance; scripts/run-alpine-gdb.sh launches the same environment under GDB for crash analysis; notes/setup.md documents how to build QEMU v2.3.0, create a floppy image, boot Alpine Linux, compile the guest PoC, and run it; logs/example-gdb-logs.log contains an example crash trace showing corrupted state and a crash in QEMU timer handling. The README explicitly states this is only a crash/DoS demonstrator and not a VM escape or host RCE exploit. The exploit does not contact remote network services or external C2 infrastructure. Its meaningful targets are local/virtualized resources: the guest-accessible FDC I/O port 0x3f5 and the vulnerable host QEMU process. The included scripts use QEMU user-mode networking (-net nic -net user), but networking is only for guest convenience and not part of the exploit path. Overall, this is a PoC-quality research repository intended to reproduce and analyze the VENOM crash condition in a controlled lab.
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