CVE-2025-30327: Integer Overflow Vulnerability in InCopy Leading to Potential Arbitrary Code Execution

Overview

CVE-2025-30327 is a critical vulnerability that affects InCopy versions 20.2, 19.5.3 and earlier. This security flaw, classified as an integer overflow or wraparound vulnerability, could potentially allow an attacker to execute arbitrary code in the context of the current user. It’s important to note that the exploitation of this vulnerability requires user interaction, meaning a victim must open a malicious file. The severity of this vulnerability lies in its potential to compromise systems and lead to data leakage, making it a significant concern for users and organizations that rely on the affected InCopy versions.

Vulnerability Summary

CVE ID: CVE-2025-30327
Severity: High (7.8 CVSS Score)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage, with arbitrary code execution in the context of the current user.

Affected Products

Product | Affected Versions

InCopy | 20.2, 19.5.3 and earlier

How the Exploit Works

The vulnerability stems from an integer overflow or wraparound within the affected InCopy versions. When a user opens a malicious file, this creates an opportunity for the attacker to trigger the integer overflow. This event can lead to memory corruption and cause the software to behave unpredictably. In some scenarios, it may allow the attacker to execute arbitrary code within the context of the current user, hence compromising the system or causing potential data leakage.

Conceptual Example Code

While the exact details of exploiting this vulnerability are complex and depend on the specific implementation of InCopy, a theoretical exploit might look something like this:

#include <stdio.h>
#include <stdlib.h>
void vulnerable_function(char *str) {
int overflow_check = INT_MAX;
overflow_check += strlen(str);
//... Additional vulnerable code
}
int main(int argc, char **argv) {
vulnerable_function(argv[1]);
return 0;
}

In this conceptual example, the program is vulnerable to an integer overflow if an attacker can control the input to the `vulnerable_function`.

Mitigation

To mitigate the risk of this vulnerability, affected users of InCopy are recommended to apply the vendor patch once it becomes available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could serve as a temporary mitigation measure. Regularly updating and patching software, as well as educating users about the risks of opening untrusted files, can also help to prevent the successful exploitation of similar vulnerabilities in the future.