CVE-2020-25573
📋 TL;DR
CVE-2020-25573 is a memory safety vulnerability in the linked-hash-map Rust crate where uninitialized NonNull pointers violate non-null constraints, potentially leading to memory corruption. This affects any Rust application using vulnerable versions of this popular data structure library. Attackers could exploit this to cause crashes or potentially execute arbitrary code.
💻 Affected Systems
- linked-hash-map Rust crate
📦 What is this software?
Linked Hash Map by Linked Hash Map Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crashes, denial of service, or memory corruption leading to unpredictable behavior.
If Mitigated
Application crashes with minimal data loss if proper memory safety controls and sandboxing are implemented.
🎯 Exploit Status
Exploitation requires crafting specific inputs to trigger the memory corruption, but public proof-of-concept exists in the advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.5.3 and later
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2020-0026.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to specify linked-hash-map >=0.5.3
2. Run 'cargo update' to fetch the patched version
3. Rebuild and redeploy your Rust application
4. Restart any running services using the application
🔧 Temporary Workarounds
Remove linked-hash-map dependency
allReplace linked-hash-map usage with alternative data structures like std::collections::HashMap or other hash map implementations.
cargo remove linked-hash-map
Pin to patched version
allForce Cargo to use only the patched version by adding version constraint to Cargo.toml.
linked-hash-map = ">=0.5.3"
🧯 If You Can't Patch
- Implement input validation and sanitization for all data processed by linked-hash-map
- Deploy application in sandboxed/containerized environments with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock for linked-hash-map version: grep -A2 -B2 'linked-hash-map' Cargo.lockCheck Version:
cargo tree | grep linked-hash-mapVerify Fix Applied:
Verify linked-hash-map version is 0.5.3 or higher: cargo tree | grep linked-hash-map📡 Detection & Monitoring
Log Indicators:
- Segmentation fault logs
- Memory access violation errors
- Application crash dumps
Network Indicators:
- Sudden service unavailability
- Increased error rates in HTTP responses
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory corruption" OR "linked-hash-map")