CVE-2019-25705: Echo Mirage Buffer Overflow Vulnerability

CVE-2019-25705 Overview

Echo Mirage 3.1 contains a stack buffer overflow vulnerability that allows local attackers to crash the application or execute arbitrary code by supplying an oversized string in the Rules action field. This vulnerability exists due to improper input validation when processing user-supplied data in the Rules dialog component.

Critical Impact

Local attackers can exploit this vulnerability to achieve arbitrary code execution or cause denial of service by overwriting the return address through a crafted payload exceeding buffer boundaries.

Affected Products

• Echo Mirage 3.1

Discovery Timeline

• 2026-04-12 - CVE CVE-2019-25705 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2019-25705

Vulnerability Analysis

This vulnerability is classified as CWE-787 (Out-of-bounds Write), which occurs when software writes data past the end of the intended buffer. In Echo Mirage 3.1, the Rules action field fails to properly validate the length of user-supplied input before copying it into a fixed-size stack buffer. When an attacker provides an oversized string, the application writes beyond the allocated buffer space on the stack, potentially corrupting adjacent memory including the saved return address.

The attack requires local access to the system where Echo Mirage is installed. An attacker can craft a malicious text file containing an oversized payload and paste the contents into the Rules action field through the application's Rules dialog interface. This triggers the buffer overflow condition and allows the attacker to overwrite critical stack data.

Root Cause

The root cause of this vulnerability is insufficient bounds checking on user input within the Rules action field processing logic. The application allocates a fixed-size buffer on the stack but does not verify that incoming data fits within the allocated space before performing the copy operation. This classic stack buffer overflow pattern allows attackers to corrupt stack memory, including the saved return address, enabling control flow hijacking.

Attack Vector

The attack is executed locally through the Echo Mirage application's graphical user interface. The attacker must craft a payload that exceeds the expected buffer size for the Rules action field. The exploitation process involves:

1. Creating a text file containing a malicious payload string designed to overflow the stack buffer
2. Opening the Echo Mirage application and navigating to the Rules dialog
3. Pasting the oversized string content into the action field
4. Triggering the overflow which overwrites the return address on the stack

The vulnerability allows an attacker to either crash the application (denial of service) or achieve arbitrary code execution if the payload is carefully constructed to redirect execution flow to attacker-controlled shellcode.

A proof-of-concept exploit for this vulnerability is documented in Exploit-DB #46216. The VulnCheck Security Advisory provides additional technical details on the stack buffer overflow via the Rules action field.

Detection Methods for CVE-2019-25705

Indicators of Compromise

• Unexpected crashes of the Echo Mirage application, particularly when using the Rules functionality
• Presence of unusually large text files or clipboard data containing repetitive patterns or shellcode signatures
• Suspicious process behavior following Echo Mirage crashes, such as spawned child processes or network connections

Detection Strategies

• Monitor for application crash events related to Echo Mirage 3.1 with stack corruption signatures
• Implement endpoint detection rules to identify buffer overflow exploitation patterns targeting GUI applications
• Deploy application whitelisting to prevent unauthorized code execution following potential exploitation

Monitoring Recommendations

• Enable crash dump collection for Echo Mirage to capture memory state during exploitation attempts
• Monitor process execution chains for anomalous child processes spawned by Echo Mirage
• Configure endpoint protection solutions to alert on stack-based buffer overflow exploitation techniques

How to Mitigate CVE-2019-25705

Immediate Actions Required

• Discontinue use of Echo Mirage 3.1 if not required for critical operations
• Restrict local access to systems where Echo Mirage is installed to trusted users only
• Consider migrating to alternative network interception tools that are actively maintained and patched

Patch Information

No vendor patch is currently available for this vulnerability. Echo Mirage appears to be legacy software available through the SourceForge Project Archive. Additional information about the original software can be found at the Initd Software Overview.

Organizations should evaluate whether continued use of this software is necessary given the lack of security updates.

Workarounds

• Implement application sandboxing to contain potential exploitation impact
• Restrict access to the Echo Mirage application to only authorized security personnel
• Avoid pasting untrusted content into the Rules action field
• Consider running the application in an isolated virtual machine environment to limit the impact of successful exploitation