CVE-2015-3442 – CVE-2015-3442 is an authentication bypass vulne... (How to Fix)

Q: What is the severity of CVE-2015-3442?

CVE-2015-3442 has a CVSS score of 9.8 (CRITICAL). CVE-2015-3442 is an authentication bypass vulnerability in Soreco Xpert.Line 3.0 that allows local attackers to intercept Windows API calls and impersonate legitimate users. This enables privilege escalation and unauthorized access to the system. Organizations using Soreco Xpert.Line 3.0 are affected.

📋 TL;DR

CVE-2015-3442 is an authentication bypass vulnerability in Soreco Xpert.Line 3.0 that allows local attackers to intercept Windows API calls and impersonate legitimate users. This enables privilege escalation and unauthorized access to the system. Organizations using Soreco Xpert.Line 3.0 are affected.

💻 Affected Systems

Products:

Soreco AG Xpert.Line

Versions: Version 3.0

Operating Systems: Windows

Default Config Vulnerable: ⚠️ Yes

Notes: Requires local access to the Windows system running Xpert.Line 3.0.

📦 What is this software?

Xpert.line by Soreco

View all CVEs affecting Xpert.line →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete system compromise with administrative privileges, data theft, and persistent backdoor installation.

🟠

Likely Case

Unauthorized access to sensitive business data and privilege escalation within the Xpert.Line application.

🟢

If Mitigated

Limited impact due to network segmentation and strict access controls preventing local access.

🌐 Internet-Facing: LOW - Requires local access to the system, not directly exploitable over network.

🏢 Internal Only: HIGH - Local attackers or malware on the system can exploit this vulnerability.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploit requires local system access and knowledge of Windows API hooking techniques.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Unknown

Vendor Advisory: Not available

Restart Required: No

Instructions:

No official patch available. Consider upgrading to newer versions if available or implementing workarounds.

🔧 Temporary Workarounds

Restrict Local Access

windows

Limit physical and remote access to systems running Xpert.Line to authorized personnel only.

Application Whitelisting

windows

Implement application control policies to prevent unauthorized programs from running on affected systems.

Using Windows AppLocker or similar solutions

🧯 If You Can't Patch

Isolate affected systems on separate network segments with strict access controls
Implement endpoint detection and response (EDR) solutions to monitor for API hooking attempts

🔍 How to Verify

Check if Vulnerable:

Check if Soreco Xpert.Line version 3.0 is installed on Windows systems.

Check Version:

Check application properties or installation directory for version information.

Verify Fix Applied:

Verify system is running a version other than 3.0 or has been removed.

📡 Detection & Monitoring

Log Indicators:

Unusual authentication events, multiple failed login attempts followed by successful login from same system

Network Indicators:

Unusual outbound connections from Xpert.Line systems

SIEM Query:

EventID=4625 (failed logon) followed by EventID=4624 (successful logon) from same source system within short timeframe

📊 Metadata

CVE ID: CVE-2015-3442

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-287

Published: September 7, 2017

Last Updated: April 20, 2025

🔗 References

http://packetstormsecurity.com/files/132549/Soreco-AG-Xpert.Line-3.0-Authentication-Bypass.html Mitigation,Third Party Advisory,VDB Entry
http://seclists.org/fulldisclosure/2015/Jul/9 Mailing List,Mitigation,Third Party Advisory
http://www.securityfocus.com/archive/1/535923/100/0/threaded
http://www.securityfocus.com/bid/75542 Third Party Advisory,VDB Entry
https://www.compass-security.com/fileadmin/Datein/Research/Advisories/CSNC-2015-001_Authentication_Bypass_Xpert_Line.txt Mitigation,Third Party Advisory
http://packetstormsecurity.com/files/132549/Soreco-AG-Xpert.Line-3.0-Authentication-Bypass.html Mitigation,Third Party Advisory,VDB Entry
http://seclists.org/fulldisclosure/2015/Jul/9 Mailing List,Mitigation,Third Party Advisory
http://www.securityfocus.com/archive/1/535923/100/0/threaded
http://www.securityfocus.com/bid/75542 Third Party Advisory,VDB Entry
https://www.compass-security.com/fileadmin/Datein/Research/Advisories/CSNC-2015-001_Authentication_Bypass_Xpert_Line.txt Mitigation,Third Party Advisory

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