CVE-2018-13421
📋 TL;DR
CVE-2018-13421 is a heap-based buffer over-read vulnerability in the Fast C++ CSV Parser library's trim_chars function. This allows attackers to read memory beyond allocated buffers, potentially exposing sensitive information or causing crashes. Any application using vulnerable versions of this library is affected.
💻 Affected Systems
- fast-cpp-csv-parser
📦 What is this software?
Fast Cpp Csv Parser by Fast Cpp Csv Parser Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, though buffer over-reads typically enable information disclosure rather than direct code execution.
Likely Case
Application crashes (denial of service) or information disclosure of adjacent memory contents.
If Mitigated
Application crashes without data loss if proper input validation and memory protections are in place.
🎯 Exploit Status
Exploitation requires feeding malicious CSV input to applications using the vulnerable library.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version from 2018-07-06 or later
Vendor Advisory: https://github.com/ben-strasser/fast-cpp-csv-parser/issues/67
Restart Required: Yes
Instructions:
1. Update to fast-cpp-csv-parser version from 2018-07-06 or later
2. Recompile any applications using the library
3. Restart affected services
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation on CSV data before passing to the parser
Library Replacement
allReplace fast-cpp-csv-parser with alternative CSV parsing libraries
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all CSV input
- Use application-level firewalls to block suspicious CSV content patterns
🔍 How to Verify
Check if Vulnerable:
Check if application uses fast-cpp-csv-parser version older than 2018-07-06Check Version:
Check library version in source code or build configurationVerify Fix Applied:
Verify fast-cpp-csv-parser version is from 2018-07-06 or later and application handles CSV input without crashes📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory access violation errors
- Unexpected process terminations
Network Indicators:
- Large or malformed CSV file uploads
- Unusual CSV parsing requests
SIEM Query:
process:segfault AND application:*csv* OR process:terminated AND memory:violation