CVE-2019-25341: iNetTools for iOS DoS Vulnerability

CVE-2019-25341 Overview

CVE-2019-25341 is a denial of service vulnerability affecting iNetTools for iOS version 8.20. The vulnerability exists in the Whois feature of the application, allowing attackers to crash the application by manipulating input. Specifically, attackers can paste a specially crafted 98-character buffer into the Domain Name field to trigger an application crash, resulting in a stack-based buffer overflow condition.

Critical Impact

This vulnerability enables attackers to cause a denial of service condition by crashing the iNetTools application through malformed input in the Whois feature, potentially disrupting network diagnostic workflows for iOS users.

Affected Products

• iNetTools for iOS version 8.20

Discovery Timeline

• 2026-02-12 - CVE CVE-2019-25341 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2019-25341

Vulnerability Analysis

This vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), indicating that the application fails to properly validate the length of user input before processing it. When a user enters or pastes content into the Domain Name field within the Whois feature, the application does not enforce adequate bounds checking on the input buffer.

The attack requires local access and user interaction, as the victim must have the application installed and actively use the Whois feature where the malicious input is entered. While this limits the attack surface, it still poses a risk in scenarios where users may copy-paste domain names from untrusted sources or when the application processes data from external inputs.

Root Cause

The root cause of this vulnerability is improper input validation in the Whois feature's Domain Name field handler. The application allocates a fixed-size buffer on the stack to store the domain name input but does not verify that the incoming data fits within this allocated space. When a 98-character payload is provided, it exceeds the buffer boundary, causing stack corruption and ultimately leading to an application crash.

This is a classic stack-based buffer overflow scenario where the developer failed to implement proper boundary checks before copying user-supplied data into a stack-allocated buffer.

Attack Vector

The attack vector requires local access to the device with the iNetTools application installed. An attacker must craft a specific 98-character input string and paste it into the Domain Name field of the Whois feature. This can be accomplished through:

1. Social engineering to convince a user to paste a malicious string
2. Clipboard manipulation if another compromised application can modify clipboard contents
3. Direct physical access to the device

The vulnerability manifests when the Whois query is initiated with the oversized input, causing the buffer overflow and subsequent application crash. For detailed technical information about the exploit, refer to the Exploit-DB #47716 entry and the VulnCheck Advisory on InetTools.

Detection Methods for CVE-2019-25341

Indicators of Compromise

• Unexpected crashes of the iNetTools application, particularly when using the Whois feature
• Crash logs showing stack corruption or buffer overflow indicators in the Whois module
• User reports of application instability after pasting content into the Domain Name field

Detection Strategies

• Monitor application crash reports for patterns indicating buffer overflow conditions in iNetTools
• Implement mobile device management (MDM) policies to track application stability and crash frequency
• Review iOS system logs for abnormal termination signals associated with the iNetTools process

Monitoring Recommendations

• Configure crash reporting tools to alert on repeated iNetTools application failures
• Establish baseline crash rates for managed iOS applications to detect anomalous behavior
• Monitor clipboard activity on managed devices for unusually long strings that could be used in exploitation attempts

How to Mitigate CVE-2019-25341

Immediate Actions Required

• Update iNetTools to a patched version if available from the App Store
• Advise users to avoid pasting untrusted content into the Whois Domain Name field
• Consider removing or disabling iNetTools on managed devices until a patch is confirmed
• Implement MDM policies to restrict usage of vulnerable application versions

Patch Information

Users should check the Apple App Store for updated versions of iNetTools that address this vulnerability. Review the VulnCheck Advisory on InetTools for the latest remediation guidance.

Workarounds

• Avoid using the Whois feature in iNetTools until a patch is available
• Do not paste content from untrusted sources into the Domain Name field
• Use alternative network diagnostic tools that do not have this vulnerability
• Manually type domain names rather than pasting from clipboard when using the Whois feature