CVE-2022-0630
📋 TL;DR
CVE-2022-0630 is an out-of-bounds read vulnerability in mruby, a lightweight Ruby implementation. This vulnerability allows attackers to read memory beyond allocated buffers, potentially exposing sensitive information or causing crashes. It affects systems running mruby versions prior to 3.2.
💻 Affected Systems
- mruby
📦 What is this software?
Mruby by Mruby
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure leading to exposure of sensitive data, memory corruption, or denial of service through application crashes.
Likely Case
Application instability, crashes, or limited information disclosure depending on memory layout and attacker control.
If Mitigated
Minimal impact if proper memory protections and sandboxing are in place, potentially just crashes.
🎯 Exploit Status
Exploitation requires specific conditions and memory manipulation knowledge. No public exploits have been documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: mruby 3.2 and later
Vendor Advisory: https://github.com/mruby/mruby/commit/ff3a5ebed6ffbe3e70481531cfb969b497aa73ad
Restart Required: Yes
Instructions:
1. Update mruby to version 3.2 or later. 2. Recompile any applications using mruby. 3. Restart affected services.
🔧 Temporary Workarounds
Memory hardening
linuxEnable ASLR and other memory protection mechanisms to reduce impact
echo 2 > /proc/sys/kernel/randomize_va_space
🧯 If You Can't Patch
- Isolate affected systems from untrusted networks
- Monitor for abnormal crashes or memory access patterns
🔍 How to Verify
Check if Vulnerable:
Check mruby version with 'mruby --version' or examine application dependenciesCheck Version:
mruby --versionVerify Fix Applied:
Confirm mruby version is 3.2 or later and verify commit ff3a5ebed6ffbe3e70481531cfb969b497aa73ad is present📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Unexpected memory access errors in logs
Network Indicators:
- No specific network indicators for this local memory vulnerability
SIEM Query:
search 'segmentation fault' OR 'out of bounds' OR 'memory access' in application logs