Overview
The CVE-2025-27075 outlines a serious vulnerability in Bluetooth hosts that could potentially lead to system compromise or data leakage. The issue lies in the processing of IOCTL commands with larger buffers, which can result in memory corruption. This vulnerability affects a wide range of devices that employ Bluetooth technology and could be exploited by malicious actors to gain unauthorized access or control over the systems, posing serious security risks to both individuals and organizations.
This vulnerability is significant due to the ubiquity of Bluetooth technology across various devices, from smartphones and laptops to IoT devices and automotive systems. An exploit could lead to serious consequences, including loss of sensitive data, interruption of services, and unauthorized control of devices.
Vulnerability Summary
CVE ID: CVE-2025-27075
Severity: High (CVSS: 7.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Bluetooth Host | All versions prior to Patch XX.X
How the Exploit Works
The vulnerability arises from the mishandling of IOCTL commands with larger buffers in Bluetooth hosts. IOCTL, or input/output control, is a system call for device-specific I/O operations. A malicious actor could craft and send an IOCTL command with an overly large buffer that the Bluetooth host is not equipped to handle, causing memory corruption. This corruption could lead to unexpected behaviors, including system crashes, data leakage, or potentially providing an attacker with a means to execute arbitrary code.
Conceptual Example Code
Here is a conceptual example of how the exploit might be executed. Please note that this is a simplified demonstration and real-world exploitation would likely involve more complex techniques and obfuscation:
#include <sys/ioctl.h>
#include <fcntl.h>
#include <string.h>
int main() {
int fd = open("/dev/bluetooth", O_RDWR);
char buffer[1024000]; // excessively large buffer
memset(buffer, 'A', sizeof(buffer)); // fill the buffer with 'A'
ioctl(fd, BLUETOOTH_SOME_IOCTL, &buffer); // send IOCTL command with the large buffer
return 0;
}In this example, the attacker opens the Bluetooth device and sends an IOCTL command with an excessively large buffer that causes memory corruption. The attacker could then leverage this vulnerability to compromise the system or leak data.
Mitigation
As a mitigation, users should immediately apply the vendor’s patch, which addresses this vulnerability. As a temporary measure, users could also implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor and filter out malicious IOCTL calls. However, these are stopgap measures and cannot replace the need for the patch.
