Executive Summary

[{'type': 'paragraph', 'content': "CVE-2019-25564 is a denial of service vulnerability in PCHelpWareV2 version 1.0.0.5 and earlier. It occurs because the application does not properly handle excessively long input strings in the 'Group' field. A local attacker can supply a buffer overflow payload into this field and trigger an application crash by confirming the input."}, {'type': 'paragraph', 'content': 'The vulnerability exploits an out-of-bounds write condition (CWE-787) by pasting a crafted string into the Group property field and clicking Ok, which causes the application to crash.'}] [1, 3]

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can impact you by causing a denial of service condition in the PCHelpWareV2 application. An attacker with local access can crash the application by exploiting the buffer overflow in the Group field, leading to application instability and unavailability.

Since the attack requires local access and user interaction, it may disrupt normal operations but does not allow for remote code execution or data compromise.

Useful 0 Not Useful 0

Compliance Impact

I don't know

Useful 0 Not Useful 0

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by attempting to reproduce the crash condition in the PCHelpWare Viewer application. Specifically, a crafted buffer overflow payload consisting of an excessively long string (e.g., 100 "A" characters) can be pasted into the \'Group\' field of the application.'}, {'type': 'paragraph', 'content': 'A proof-of-concept Python script named "PCHelpWareV2.py" generates a file "PCHelpWareV2.txt" containing this crafted buffer. The detection procedure involves copying the contents of this file to the clipboard, opening the PCHelpWare Viewer, navigating to the Properties section, pasting the clipboard content into the \'Group\' field, and clicking \'Ok\'. If the application crashes, the vulnerability is present.'}, {'type': 'paragraph', 'content': 'No specific network commands are applicable since this is a local vulnerability triggered by user interaction within the application.'}] [1, 3]

Useful 0 Not Useful 0

Mitigation Strategies

[{'type': 'paragraph', 'content': "Immediate mitigation steps include avoiding the input of excessively long strings or buffer overflow payloads into the 'Group' field of the PCHelpWare Viewer application."}, {'type': 'paragraph', 'content': 'Since the vulnerability requires local user interaction, restricting access to the application to trusted users and limiting local access can reduce the risk.'}, {'type': 'paragraph', 'content': "Additionally, monitoring for application crashes related to the 'Group' field input can help identify exploitation attempts."}, {'type': 'paragraph', 'content': 'Check for updates or patches from the vendor (https://www.uvnc.com/home.html) that address this vulnerability and apply them as soon as they become available.'}] [1, 3]

Useful 0 Not Useful 0