CVE-2018-25222: SC v7.16 Buffer Overflow Vulnerability

CVE-2018-25222 Overview

CVE-2018-25222 is a stack-based buffer overflow vulnerability affecting SC version 7.16. This memory corruption flaw allows local attackers to execute arbitrary code by supplying oversized input that exceeds buffer boundaries. Attackers can craft malicious input strings exceeding 1052 bytes to overwrite the instruction pointer and execute shellcode in the application context.

Critical Impact

Local attackers can achieve arbitrary code execution by exploiting the buffer overflow to overwrite the instruction pointer and execute shellcode within the application's security context.

Affected Products

• SC v7.16

Discovery Timeline

• 2026-03-28 - CVE CVE-2018-25222 published to NVD
• 2026-03-30 - Last updated in NVD database

Technical Details for CVE-2018-25222

Vulnerability Analysis

This vulnerability is classified under CWE-787 (Out-of-bounds Write), which occurs when the software writes data past the end, or before the beginning, of the intended buffer. In the case of CVE-2018-25222, SC v7.16 fails to properly validate the length of user-supplied input before copying it into a fixed-size stack buffer. When an attacker provides input exceeding 1052 bytes, the overflow corrupts adjacent memory on the stack, including critical control structures such as saved return addresses.

The local attack vector means an attacker must have some level of local access to the system running the vulnerable software. However, once exploitation is successful, the attacker gains the ability to execute arbitrary code with the same privileges as the vulnerable application. This could lead to complete system compromise if the application runs with elevated privileges.

Root Cause

The root cause of this vulnerability is improper bounds checking when handling user-supplied input. The application allocates a fixed-size buffer on the stack but does not verify that incoming data fits within the allocated space before performing memory copy operations. This classic programming error allows attackers to overflow the buffer and corrupt adjacent stack memory, including the saved instruction pointer (EIP/RIP).

Attack Vector

The attack is executed locally, requiring the attacker to have access to the system where SC v7.16 is installed. The attacker crafts a malicious payload consisting of more than 1052 bytes of data. This input is designed to overflow the vulnerable stack buffer, overwrite the saved return address, and redirect program execution to attacker-controlled shellcode.

The exploitation process typically involves:

1. Identifying the exact buffer size and offset to the return address
2. Crafting a payload with padding, a new return address pointing to shellcode, and the shellcode itself
3. Providing this malicious input to the vulnerable application
4. Upon function return, execution jumps to the attacker's shellcode

For technical details on the exploitation technique, refer to the Exploit-DB #44279 and VulnCheck Advisory.

Detection Methods for CVE-2018-25222

Indicators of Compromise

• Presence of SC version 7.16 installations on systems
• Unusual process behavior or crashes associated with the SC application
• Detection of shellcode patterns or NOP sleds in memory dumps related to SC processes
• Anomalous child processes spawned from the SC application

Detection Strategies

• Monitor for abnormally large input being passed to the SC application
• Implement endpoint detection rules to identify stack-based buffer overflow exploitation attempts
• Deploy memory protection monitoring to detect exploitation of buffer overflows
• Use application behavior analysis to identify suspicious execution patterns following input processing

Monitoring Recommendations

• Enable detailed logging for the SC application to capture input sizes and potential crash events
• Implement process monitoring to detect unexpected code execution or privilege escalation attempts
• Monitor for creation of suspicious child processes from the SC application context
• Configure alerts for application crashes that may indicate exploitation attempts

How to Mitigate CVE-2018-25222

Immediate Actions Required

• Identify all systems running SC version 7.16 and prioritize them for remediation
• Restrict local access to systems running the vulnerable software to trusted users only
• Consider disabling or removing the vulnerable application if not critical to operations
• Implement application whitelisting to prevent unauthorized code execution

Patch Information

Check with the software vendor for updated versions of SC that address this buffer overflow vulnerability. Organizations should upgrade to a patched version as soon as one becomes available. In the absence of an official patch, consider alternative software solutions or implement compensating controls.

For additional technical information, see the VulnCheck Advisory.

Workarounds

• Limit local access to systems running SC v7.16 to only essential personnel
• Deploy exploit mitigation technologies such as ASLR, DEP, and stack canaries at the operating system level
• Use application sandboxing to contain potential exploitation attempts
• Implement input validation at the system level to reject oversized inputs before they reach the vulnerable application

# Configuration example - Enable DEP (Data Execution Prevention) on Windows
bcdedit /set nx AlwaysOn

# Verify ASLR is enabled on Linux
cat /proc/sys/kernel/randomize_va_space
# Value should be 2 for full randomization