CVE-2019-25319 Overview
CVE-2019-25319 is a stack overflow vulnerability in Domain Quester Pro version 6.02 that enables remote attackers to execute arbitrary code. The vulnerability occurs when attackers craft a malicious payload targeting the 'Domain Name Keywords' input field, which triggers a stack-based buffer overflow. This overflow allows overwriting of Structured Exception Handler (SEH) registers, leading to an access violation that can be exploited to execute a bind shell on port 9999.
Critical Impact
Successful exploitation allows attackers to achieve arbitrary code execution by overwriting SEH registers, potentially resulting in complete system compromise through a bind shell connection.
Affected Products
- Domain Quester Pro 6.02
Discovery Timeline
- 2026-02-12 - CVE-2019-25319 published to NVD
- 2026-02-12 - Last updated in NVD database
Technical Details for CVE-2019-25319
Vulnerability Analysis
This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow). The application fails to properly validate the length of user-supplied input in the 'Domain Name Keywords' input field. When an attacker provides an overly long string to this field, the application writes beyond the allocated stack buffer boundaries, corrupting adjacent memory including the SEH chain.
The exploitation technique leverages Windows Structured Exception Handling mechanisms. By carefully crafting the overflow payload, an attacker can overwrite the SEH pointer with a controlled address, redirect execution flow when an exception is triggered, and ultimately execute arbitrary shellcode that establishes a bind shell listening on port 9999.
Root Cause
The root cause is insufficient bounds checking on user input within the Domain Name Keywords processing functionality. The application allocates a fixed-size buffer on the stack but does not verify that the input data length does not exceed this buffer size before copying the data. This classic stack-based buffer overflow condition allows memory corruption of critical stack structures including saved return addresses and exception handler pointers.
Attack Vector
The attack requires local access with user interaction. An attacker must convince a user to open a specially crafted file or input malicious data into the 'Domain Name Keywords' field. The attack sequence involves supplying an oversized input string containing a carefully constructed payload that overwrites the SEH chain with attacker-controlled values. When the buffer overflow triggers an access violation, Windows invokes the corrupted exception handler, transferring execution to attacker-supplied shellcode. The shellcode then establishes a bind shell on port 9999, providing the attacker with remote command execution capabilities.
The vulnerability manifests when the application processes user input in the Domain Name Keywords field without proper boundary validation. Technical details and proof-of-concept information can be found in the Exploit-DB entry #47825 and the VulnCheck Security Advisory.
Detection Methods for CVE-2019-25319
Indicators of Compromise
- Unexpected outbound or listening connections on port 9999
- Domain Quester Pro application crashes or access violation errors
- Presence of bind shell processes spawned by the Domain Quester Pro executable
- Unusual memory access patterns in application logs
Detection Strategies
- Monitor for Domain Quester Pro 6.02 installations in your environment through software inventory scans
- Implement endpoint detection rules to identify SEH-based exploitation attempts
- Deploy network monitoring to detect unexpected bind shell connections on port 9999
- Enable crash dump collection for Domain Quester Pro to identify exploitation attempts
Monitoring Recommendations
- Configure host-based intrusion detection to alert on suspicious child processes spawned by Domain Quester Pro
- Implement network segmentation to limit potential lateral movement from compromised systems
- Enable Windows Event Logging for application crashes and access violations
- Monitor for anomalous network listeners using netstat or equivalent tools
How to Mitigate CVE-2019-25319
Immediate Actions Required
- Discontinue use of Domain Quester Pro 6.02 until a patched version is available
- Implement application whitelisting to prevent unauthorized code execution
- Deploy network-level controls to block unauthorized connections on port 9999
- Isolate systems running vulnerable software from critical network segments
Patch Information
No vendor patch information is currently available for this vulnerability. The Internet Soft Homepage should be monitored for security updates. Organizations should consider alternative software solutions that provide similar functionality with active security maintenance.
Workarounds
- Remove or uninstall Domain Quester Pro 6.02 from production systems
- If the software must remain in use, restrict access to trusted users only and avoid processing untrusted input files
- Implement Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) at the operating system level to increase exploitation difficulty
- Deploy endpoint protection solutions capable of detecting SEH-based exploitation techniques
# Block outbound connections on port 9999 using Windows Firewall
netsh advfirewall firewall add rule name="Block Port 9999" dir=out action=block protocol=TCP localport=9999
netsh advfirewall firewall add rule name="Block Port 9999 Inbound" dir=in action=block protocol=TCP localport=9999
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
