Overview
The cybersecurity landscape is riddled with vulnerabilities that offer potential entry points for malicious actors. One such critical vulnerability, CVE-2025-5867, has been discovered in RT-Thread 5.1.0, an open-source, real-time operating system. This vulnerability specifically affects the file rt-thread/components/lwp/lwp_syscall.c, and more precisely, the function csys_sendto. With the right manipulation, this could lead to a null pointer dereference, potentially compromising the system or causing data leakage. This vulnerability is of significant concern to all users of RT-Thread 5.1.0 due to its potential to cause extensive harm.
Vulnerability Summary
CVE ID: CVE-2025-5867
Severity: Critical (CVSS score 8.0)
Attack Vector: Local network
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
RT-Thread | 5.1.0
How the Exploit Works
This vulnerability resides in the csys_sendto function of the lwp_syscall.c file in RT-Thread 5.1.0. An attacker can manipulate the arguments to this function, leading to a null pointer dereference. This could allow the attacker to execute arbitrary code or cause a denial of service (DoS) by crashing the system.
In essence, an attacker who successfully exploits this vulnerability could potentially gain control of the affected system or gain access to sensitive information, which could lead to extensive data breaches.
Conceptual Example Code
This is a conceptual example demonstrating how the vulnerability might be exploited. It is not a real exploit but a simplified representation.
#include <stdio.h>
#include <rtthread.h>
int main() {
char *malicious_payload = NULL;
csys_sendto(malicious_payload);
return 0;
}In this pseudo-code, a NULL pointer is sent to the csys_sendto function, triggering the vulnerability. An actual exploit would likely be more complex and specifically crafted to cause maximum damage or gain unauthorized access to the system.
In conclusion, it is paramount for users of RT-Thread 5.1.0 to mitigate this vulnerability by applying the vendor patch or using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) for temporary mitigation.