Overview

The cybersecurity world is constantly evolving, with new vulnerabilities being discovered regularly. One such vulnerability, identified as CVE-2025-54212, has recently been discovered in InDesign Desktop versions 20.4, 19.5.4 and earlier. This security flaw is of particular concern as it can potentially lead to an arbitrary code execution in the context of the current user.
An attacker can exploit this vulnerability, which involves a Heap-based Buffer Overflow, by persuading a user to open a malicious file. This could potentially compromise the system or result in data leakage, posing a significant risk to organizations and individual users alike.

Vulnerability Summary

CVE ID: CVE-2025-54212
Severity: High (7.8 CVSS score)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

InDesign Desktop | 20.4 and earlier
InDesign Desktop | 19.5.4 and earlier

How the Exploit Works

The Heap-based Buffer Overflow vulnerability in InDesign Desktop versions 20.4, 19.5.4 and earlier allows for arbitrary code execution. This happens when the application fails to properly manage the memory allocated for processing certain files.
When a user opens a malicious file, excess data can overflow the buffer, corrupting nearby space in memory and allowing for the execution of arbitrary code. This code runs in the context of the current user, meaning that if the user has administrative privileges, the attacker could take control of the affected system.

Conceptual Example Code

Below is a simplified conceptual example of a potential malicious payload, designed to exploit this vulnerability:

#include<stdio.h>
#include<string.h>
void malicious_function(char *str) {
char buffer[100];
strcpy(buffer, str);
}
int main() {
char *malicious_str = "This is a long string that will overflow the buffer...";
malicious_function(malicious_str);
return 0;
}

In this example, the `malicious_function` does not check the length of the input string before copying it into the `buffer`, leading to a buffer overflow if the input string is longer than the buffer. The overflow can corrupt adjacent memory locations and potentially allow for arbitrary code execution.
Please note that this is a highly simplified example and actual exploitation of the vulnerability would likely involve more sophisticated techniques and careful crafting of the malicious file.

How to Mitigate

Apply the patch provided by the vendor as soon as possible. Until the patch can be applied, consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can help detect and block attempts to exploit this vulnerability.