CVE-2020-0872
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on systems running vulnerable versions of Microsoft Application Inspector. Attackers can exploit this by crafting malicious source files that, when analyzed by Application Inspector, inject code into the HTML output. Anyone using Application Inspector v1.0.23 or earlier to analyze untrusted source code is affected.
💻 Affected Systems
- Microsoft Application Inspector
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the Application Inspector host, potentially leading to lateral movement within the network.
Likely Case
Remote code execution on the Application Inspector server, allowing attackers to steal data, install malware, or pivot to other systems.
If Mitigated
Limited impact if Application Inspector is isolated in a sandboxed environment with no network access to sensitive systems.
🎯 Exploit Status
The vulnerability is a classic cross-site scripting (XSS) that leads to remote code execution, making exploitation straightforward for attackers with basic web security knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.0.24 and later
Vendor Advisory: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0872
Restart Required: No
Instructions:
1. Download the latest version of Application Inspector from the official Microsoft repository. 2. Uninstall the vulnerable version. 3. Install the patched version. 4. Verify the installation is complete and functioning.
🔧 Temporary Workarounds
Disable Application Inspector
allTemporarily disable Application Inspector until patching can be completed.
Stop the Application Inspector service or process
Restrict Source File Analysis
allOnly analyze source files from trusted, verified sources.
🧯 If You Can't Patch
- Isolate Application Inspector in a network segment with no access to sensitive systems
- Implement strict input validation and sanitization for all source files before analysis
🔍 How to Verify
Check if Vulnerable:
Check the Application Inspector version. If it's v1.0.23 or earlier, it's vulnerable.Check Version:
applicationinspector --versionVerify Fix Applied:
Verify the installed version is v1.0.24 or later and test with known safe source files.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Application Inspector
- Suspicious network connections originating from Application Inspector host
Network Indicators:
- Unexpected outbound connections from Application Inspector server
- Traffic patterns indicating command and control activity
SIEM Query:
source="ApplicationInspector" AND (event_type="process_creation" OR event_type="network_connection")