Improper Authorization in K7 Security K7RKScan.sys IOCTL Handler
CVE-2025-1055 is a local denial-of-service vulnerability in K7RKScan.sys, a driver shipped with the K7 Security Anti-Malware suite. According to the provided content, the driver’s IOCTL handler lacks proper access control, allowing a low-privileged local user to send crafted IOCTL requests that invoke privileged kernel-mediated actions. Specifically, an unprivileged user can abuse this missing authorization check to terminate a broad range of processes running with administrative or SYSTEM privileges, except for processes protected by built-in operating system protections. The flaw is therefore an authorization failure in a kernel driver interface exposed to user mode.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a collection of operational Proof-of-Concept (PoC) exploits demonstrating the Bring Your Own Vulnerable Driver (BYOVD) technique to kill protected processes on Windows systems. Each subdirectory targets a specific vulnerable driver, with a Rust-based executable that loads the driver as a service, opens a device handle, and sends a crafted IOCTL to terminate a process by name or PID. The exploits require the vulnerable driver file to be present in the same directory as the executable and are designed for local execution with administrative privileges. The repository covers multiple drivers, including those from Baidu Antivirus (BdApiUtil64.sys, CVE-2024-51324), K7 Ultimate Security (K7RKScan.sys, CVE-2025-52915, CVE-2025-1055), ThreatFire System Monitor (sysmon.sys), Tg Soft (viragt64.sys), and Topaz Antifraud (wsftprm.sys, CVE-2023-52271). The main entry points are the Rust 'main.rs' files in each subdirectory. The exploits are not detection scripts but provide real process termination capability, which can be used to disable AV/EDR or other security software. The code is well-structured, modular, and leverages Windows service and device APIs to interact with the drivers. The attack vector is local, requiring administrative access to load the driver. The endpoints include the driver files and their respective device interfaces (e.g., \\.\BdApiUtil, \\.\ksapi64_dev, etc.). This collection is intended for research and educational purposes to demonstrate the risks of unprotected or vulnerable kernel drivers on Windows platforms.
This repository is a proof-of-concept (PoC) exploit for CVE-2025-1055 and CVE-2025-52915, targeting the K7RKScan.sys Windows kernel driver (version 1516). The exploit consists of a C program (exploit.c) and a README.md with usage instructions. The exploit works by opening a handle to the vulnerable driver (\\.\DosK7RKScnDrv) and repeatedly sending the PID of the Windows Defender process (MsMpEng.exe) via the 0x222018 IOCTL, causing the driver to terminate the process. The README provides instructions for installing the driver and running the exploit. The attack vector is local, requiring the attacker to have the ability to load the vulnerable driver and execute the exploit on the target system. The main fingerprintable endpoints are the device path for the driver, the path to the driver file, and the target process name.
Recent activity
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerable driver named in the article as being used in BYOVD-based defense evasion activity.
A documented driver vulnerability in K7 Security Anti-Malware that DragonForce attackers abused via BYOVD techniques to disable security tooling during a ransomware intrusion.
A specific vulnerable driver issue referenced as being abused in a BYOVD defense-evasion chain to disable security tools at the kernel level during the intrusion.
A vulnerable driver flaw in K7 Security K7RKScan.sys leveraged in BYOVD tactics for kernel-level privilege and defense evasion.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.