CVE-2025-30318: Out-of-Bounds Write Vulnerability in InDesign Desktop

Overview

This blog post focuses on an identified vulnerability – CVE-2025-30318 – which affects InDesign Desktop versions ID19.5.2, ID20.2, and earlier. This is an out-of-bounds write vulnerability that can lead to arbitrary code execution in the context of the current user. It is significant because it could potentially result in system compromise or data leakage, impacting both individual users and organizations. The severity of this vulnerability underscores the importance of effective cybersecurity measures and the need to keep software up-to-date.

Vulnerability Summary

CVE ID: CVE-2025-30318
Severity: High (7.8 CVSS score)
Attack Vector: Local
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise and data leakage

Affected Products

Product | Affected Versions

InDesign Desktop | ID19.5.2
InDesign Desktop | ID20.2

How the Exploit Works

The vulnerability CVE-2025-30318 works by exploiting an out-of-bounds write flaw in the affected InDesign Desktop software. The attacker initiates the exploit by crafting a malicious file that triggers the vulnerability. This file must then be opened by a victim, which is likely done through social engineering tactics or deceptive practices. Once the file is opened, it results in arbitrary code execution in the context of the current user. This can enable the attacker to manipulate the software’s operation, potentially compromising the system or leading to data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This pseudocode simulates the process of a user opening a malicious file, leading to the execution of arbitrary code:

# Pseudocode
class MaliciousFile:
def __init__(self):
self.malicious_code = '...'
user = CurrentUser()
file = MaliciousFile()
user.open(file)  # The vulnerability is triggered here

In this example, the malicious file is opened by the user, triggering the execution of the malicious code within the context of the current user’s privileges. This serves to illustrate how simple actions like opening a file, when coupled with software vulnerabilities, can lead to significant security risks.

Mitigation Guidance

The best mitigation for this issue is to apply the vendor patch. InDesign has released updates that fix this vulnerability in their software, and users should make sure their software is up-to-date. If the patch cannot be immediately applied, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These systems can detect and block attempts to exploit the vulnerability, providing some level of protection until the software can be updated.