CVE-2023-48025
📋 TL;DR
CVE-2023-48025 is an out-of-bounds read vulnerability in Liblisp's get_length function that could allow attackers to read sensitive memory contents. This affects applications using vulnerable versions of Liblisp for Lisp language interpretation. The vulnerability could lead to information disclosure or be chained with other exploits.
💻 Affected Systems
- Liblisp
📦 What is this software?
Liblisp by Howerj
⚠️ Risk & Real-World Impact
Worst Case
Memory disclosure leading to sensitive information leakage, potential ASLR bypass, or crash causing denial of service.
Likely Case
Application crash (denial of service) or limited memory disclosure depending on input control.
If Mitigated
Minimal impact if input validation prevents triggering the vulnerable code path.
🎯 Exploit Status
Exploitation requires ability to provide crafted Lisp input to the vulnerable function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 4c65969
Vendor Advisory: https://github.com/howerj/liblisp/issues/1
Restart Required: Yes
Instructions:
1. Update Liblisp to latest version from GitHub repository
2. Recompile any applications using Liblisp
3. Restart affected services
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for Lisp code processed by the application
Memory Protection
linuxEnable ASLR and other memory protection mechanisms
sysctl -w kernel.randomize_va_space=2
🧯 If You Can't Patch
- Isolate applications using Liblisp in restricted network segments
- Implement strict input sanitization for all Lisp code processing
🔍 How to Verify
Check if Vulnerable:
Check Liblisp version/git commit hash. If commit is 4c65969 or earlier, vulnerable.Check Version:
Check git log or version information in liblisp source/buildVerify Fix Applied:
Verify Liblisp is updated to commit after 4c65969 and applications are recompiled.📡 Detection & Monitoring
Log Indicators:
- Application crashes
- Memory access violation errors
- Unexpected process termination
Network Indicators:
- Unusual Lisp code submissions to affected services
SIEM Query:
process_name:"application_using_liblisp" AND (event_type:crash OR error_message:"segmentation fault")