CVE-2021-25902
📋 TL;DR
This vulnerability in the glsl-layout Rust crate allows memory corruption through a double-free condition when a panic occurs during map_array operations. It affects any Rust application using glsl-layout versions before 0.4.0 for GPU shader layout management. Attackers could potentially exploit this to cause crashes or execute arbitrary code.
💻 Affected Systems
- glsl-layout Rust crate
📦 What is this software?
Glsl Layout by Glsl Layout Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the vulnerable application processes attacker-controlled shader data.
Likely Case
Application crash or denial of service when processing malformed shader inputs, potentially disrupting GPU-dependent services.
If Mitigated
Controlled crash with proper panic handling and memory isolation, limiting impact to the affected process only.
🎯 Exploit Status
Exploitation requires triggering a panic in map_array with specific conditions. While unauthenticated exploitation is possible if the application processes external shader data, reliable exploitation requires precise memory manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.4.0
Vendor Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0005.html
Restart Required: Yes
Instructions:
1. Update Cargo.toml to require glsl-layout >= 0.4.0
2. Run 'cargo update glsl-layout'
3. Rebuild and redeploy your application
4. Restart any running services using the updated application
🔧 Temporary Workarounds
Disable panic unwinding
allConfigure Rust to abort on panic instead of unwinding, preventing the double drop condition
Add to Cargo.toml: [profile.release] panic = 'abort'
Add to Cargo.toml: [profile.dev] panic = 'abort'
🧯 If You Can't Patch
- Isolate the vulnerable application in a container or sandbox to limit potential damage
- Implement input validation for shader data to prevent triggering the panic condition
🔍 How to Verify
Check if Vulnerable:
Check Cargo.lock or run 'cargo tree | grep glsl-layout' to see if version < 0.4.0 is usedCheck Version:
cargo tree | grep glsl-layoutVerify Fix Applied:
Verify glsl-layout >= 0.4.0 appears in Cargo.lock after update📡 Detection & Monitoring
Log Indicators:
- Application crashes with panic messages related to glsl-layout or map_array
- Memory corruption errors in application logs
Network Indicators:
- Unusual shader data uploads to graphics processing endpoints
- Increased error rates in GPU-related services
SIEM Query:
source="application_logs" AND ("glsl-layout" OR "map_array" OR "double drop") AND severity=ERROR