Overview

A critical vulnerability, CVE-2025-26785, has been discovered in NAS in various Samsung Mobile and Wearable Processors. The vulnerability, if successfully exploited, could lead to system compromise or data leakage, posing a significant security risk to users and organizations leveraging these devices. This report comprehensively details the vulnerability, its implications, and recommended mitigation measures.

Vulnerability Summary

CVE ID: CVE-2025-26785
Severity: High (7.5)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: System compromise or data leakage

Affected Products

Product | Affected Versions

Samsung Mobile Processor Exynos | 9820, 9825, 980, 990, 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400
Samsung Wearable Processor | W920, W930, W1000
Samsung Modem | Modem 5123, Modem 5300, Modem 5400

How the Exploit Works

The vulnerability originates from the lack of a length check in the software of the aforementioned processors. This oversight allows for an out-of-bounds write condition, leading to a buffer overflow. An attacker could exploit this vulnerability by sending a crafted payload that exceeds the expected data length. This could result in arbitrary code execution, leading to system compromise or data leakage.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited:

#include<stdio.h>
#include<string.h>
void vulnerable_function(char *str) {
char buffer[50];
strcpy(buffer, str);
}
int main() {
char malicious_payload[100];
memset(malicious_payload, 'A', 99);
malicious_payload[99] = '\0';
vulnerable_function(malicious_payload);
return 0;
}

In this conceptual example, the `vulnerable_function` copies the `malicious_payload` into a buffer that can only hold 50 characters, causing a buffer overflow. This could potentially allow an attacker to execute arbitrary code or cause a system crash.

Mitigation Guidance

Users and organizations are strongly advised to apply the vendor patch as soon as it is available. In the meantime, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These tools can monitor and block suspicious activities, reducing the risk of a successful exploit.