Desktop Application Security Testing
Desktop applications store data locally and often have system privileges. We test security at machine code level. Find vulnerabilities before attackers exploit them.
What is Desktop Application Security Testing?
Desktop Application Security Testing is a comprehensive binary-level security analysis of Windows, macOS, and Linux applications, combining static analysis, reverse engineering, fuzzing, and exploitation techniques. nFlo tests without requiring source code access — just as a real attacker would — and delivers a prioritized report with Proof-of-Concept for critical vulnerabilities and specific remediation steps.
One CVE in desktop application = access to entire computer
Comprehensive binary application security analysis
Binary Analysis
Executable and library analysis
Reverse Engineering
Security mechanism reverse engineering
Exploitation
Vulnerability verification through PoC
API Key Theft From Application - Real Story
A SaaS company with 50K users discovered their desktop application stored API keys in plaintext in configuration file. An attacker decompiled the .NET application, extracted keys and gained access to all user accounts. Incident cost: €500K (GDPR notifications, compensation, fines).
Without desktop application testing:
- Sensitive data leak stored locally (passwords, tokens, keys)
- Vulnerabilities enabling privilege escalation to SYSTEM/root
- Business logic reverse engineering possibility
- CVE publication risk and reputation loss
From Static Analysis to Exploitation
We don’t limit ourselves to surface scanning. We analyze application at machine code level, looking for vulnerabilities not visible in black-box tests.
What you get:
- Static binary analysis (decompilation, disassembly)
- Dynamic tests with fuzzing and debugging
- Secure storage verification (keys, passwords, tokens)
- Privilege escalation tests
- Update mechanism analysis (man-in-the-middle, code signing)
- Proof-of-Concept for critical vulnerabilities
- Report with prioritized remediation steps
Who Is It For?
This service is for you if:
- You develop desktop application for customer distribution
- Application has access to sensitive data or system privileges
- You’re planning product security certification
- You want to avoid CVE publication and related reputation loss
Test Scope
Platforms and Technologies
We test applications on all popular platforms:
- Windows: .NET, C++, Electron, Qt
- macOS: Swift, Objective-C, Electron
- Linux: C/C++, GTK, Qt, Electron
Testing Areas
1. Binary Security
- Stack canaries, ASLR, DEP/NX
- Code signing verification
- Anti-debugging, anti-tampering
2. Memory Corruption
- Buffer overflow, heap overflow
- Use-after-free, double-free
- Format string vulnerabilities
3. Privilege Escalation
- Setuid/setgid issues (Linux)
- DLL hijacking (Windows)
- Insecure file permissions
4. Secure Storage
- Credentials storage
- Encryption key management
- Sensitive data in memory
5. Communication Security
- TLS/SSL implementation
- Certificate validation
- API authentication
6. Update Mechanism
- Code signing verification
- Man-in-the-middle attacks
- Rollback protection
Example Vulnerabilities We Find
DLL Hijacking (Windows)
Vulnerability: Application loads DLL from current directory without path verification Exploit: Attacker places malicious DLL in Downloads folder, user runs app from there Impact: Arbitrary code execution with user privileges Fix: Use full paths, enable SafeDllSearchMode
Insecure Credential Storage
Vulnerability: Passwords stored in registry/config with weak encryption (XOR, Base64) Exploit: Trivial decryption, credential theft Impact: Account takeover, lateral movement Fix: Use OS credential store (Windows Credential Manager, macOS Keychain)
Buffer Overflow in Input Parsing
Vulnerability: strcpy without length check in file parser Exploit: Crafted file causes buffer overflow, ROP chain to shellcode Impact: Remote code execution when opening malicious file Fix: Use safe string functions (strncpy, snprintf), enable stack canaries
Insecure Auto-Update
Vulnerability: Update downloaded over HTTP, no signature verification Exploit: Man-in-the-middle replaces update with malware Impact: Malware distribution to all users Fix: HTTPS + code signing + pinned certificate
Tools We Use
Static Analysis:
- IDA Pro, Ghidra, Binary Ninja - disassembly and decompilation
- dnSpy, dotPeek - .NET decompilation
- strings, binwalk - quick analysis
Dynamic Analysis:
- x64dbg, WinDbg (Windows)
- lldb (macOS)
- gdb (Linux)
- Frida - dynamic instrumentation
Fuzzing:
- AFL++, libFuzzer
- WinAFL (Windows)
- Custom harnesses
Related Glossary Terms
Learn more about key concepts related to this service:
Contact your account manager
Discuss Desktop Application Security Testing with your dedicated account manager.
How we work
Our proven service delivery process.
Reconnaissance
Application, technology, functionality analysis
Static Analysis
Binary code static analysis
Dynamic Testing
Fuzzing, debugging, memory analysis
Exploitation
Vulnerability verification through PoC
Report
Documentation with prioritized remediation steps
Benefits for your business
What you gain by choosing this service.
User Security
Protect customer data from theft
Avoid CVEs
Detect vulnerabilities before publication
Product Certification
Meet security requirements
Company Reputation
Customers trust secure products
Related Articles
Expand your knowledge with our resources.
CVE-2024-58354: repository takeover via pull_request_target workflow in Cal.com (CVSS 9.9)
cal.com (calcom repository, later renamed cal.diy) is affected by a repository takeover vulnerability in its GitHub Actions workflows. The workflow pr.yml uses the pull_request_target trigger with the...
Read more →CVE-2026-42933: unintended proxy allowing OT segmentation bypass in Pronetiqs IntraVUE (CVSS 10.0)
Pronetiqs IntraVUE versions 3.2.1a14 and prior have an unintended proxy or intermediary vulnerability which could allow an attacker to use an active proxy, which would bypass OT segmentation....
Read more →CVE-2026-63732: default credential and MCP plugin command injection chain in 9router (CVSS 9.9)
9router 0.4.59 (fixed in 0.4.60) contains a chain of vulnerabilities: a hardcoded default password (123456) that authenticates any fresh installation, a bypass of the LOCAL_ONLY network gate via a spo...
Read more →Frequently Asked Questions
Common questions about Desktop Application Security Testing.
What platforms and technologies do the tests cover?
We test applications on Windows (.NET, C++, Electron, Qt), macOS (Swift, Objective-C, Electron) and Linux (C/C++, GTK, Qt, Electron). The analysis covers native binaries, managed frameworks and hybrid applications.
Do you need access to the source code?
No, we conduct tests on binary files - just as an attacker would. We use reverse engineering, decompilation and dynamic analysis. Access to the source code allows for a more thorough analysis, but is not required.
How long do the tests take and what does the report contain?
Tests take 5-10 business days. The report contains a list of vulnerabilities with severity, Proof of Concept for critical flaws, attack vector analysis (memory corruption, privilege escalation, insecure storage) and prioritized remediation steps.
Do the tests cover the application update mechanism?
Yes, we verify the security of the update mechanism - code signing, protection against man-in-the-middle and rollback protection. Vulnerabilities in the update mechanism allow an attacker to replace the application with a malicious version.