CVE-2023-26924
📋 TL;DR
This CVE describes a segmentation fault vulnerability in LLVM's MLIR component when processing malicious input files. It primarily affects developers and systems using LLVM/MLIR for code compilation or analysis. Third parties dispute its classification as a security issue per LLVM's security policy.
💻 Affected Systems
- LLVM
- MLIR (Multi-Level Intermediate Representation)
📦 What is this software?
Llvm by Llvm
⚠️ Risk & Real-World Impact
Worst Case
Denial of service through application crash when processing specially crafted input files, potentially disrupting compilation pipelines or analysis tools.
Likely Case
Application instability or crashes when processing untrusted MLIR input files, requiring restart of affected compilation processes.
If Mitigated
Minimal impact if input validation and sandboxing prevent processing of untrusted files.
🎯 Exploit Status
Exploitation requires ability to supply malicious input files to vulnerable MLIR processing. References include proof-of-concept demonstration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check LLVM repository for fixes after commit a0dab4950
Vendor Advisory: https://github.com/llvm/llvm-project/issues/60216
Restart Required: Yes
Instructions:
1. Update LLVM to version containing fix. 2. Recompile any dependent applications. 3. Restart affected services.
🔧 Temporary Workarounds
Input validation and sandboxing
allValidate and sanitize all MLIR input files before processing, run compilation in isolated environments
Disable vulnerable functionality
allAvoid using outlineSingleBlockRegion function with untrusted input
🧯 If You Can't Patch
- Implement strict input validation for all MLIR files
- Run LLVM/MLIR processes in isolated containers or sandboxes
🔍 How to Verify
Check if Vulnerable:
Check LLVM version and commit history for inclusion of a0dab4950Check Version:
llvm-config --versionVerify Fix Applied:
Verify LLVM version is updated beyond vulnerable commit, test with known malicious input files📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in LLVM/MLIR logs
- Unexpected process termination during compilation
SIEM Query:
Process termination events from LLVM/MLIR executables with segmentation fault signals🔗 References
- https://gist.github.com/Colloportus0/fc16d10d74aedf89d5d1d020ebb89c0c
- https://github.com/llvm/llvm-project/issues/60216
- https://llvm.org/docs/Security.html#what-is-considered-a-security-issue
- https://gist.github.com/Colloportus0/fc16d10d74aedf89d5d1d020ebb89c0c
- https://github.com/llvm/llvm-project/issues/60216
- https://llvm.org/docs/Security.html#what-is-considered-a-security-issue
