CVE-2021-32614
📋 TL;DR
This is an out-of-bounds read vulnerability in dmg2img versions through 20170502. An attacker can trigger a buffer overflow by providing a specially crafted DMG file, potentially leading to information disclosure or memory corruption. Anyone using dmg2img to convert Apple DMG disk images is affected.
💻 Affected Systems
- dmg2img
📦 What is this software?
Dmg2img by Dmg2img Project
⚠️ Risk & Real-World Impact
Worst Case
Memory layout information leakage could enable attackers to bypass ASLR and chain with other vulnerabilities to achieve remote code execution.
Likely Case
Information disclosure through memory leak, potentially exposing sensitive data or system information.
If Mitigated
Minimal impact if proper input validation and memory protections are in place.
🎯 Exploit Status
Exploitation requires user to process a malicious DMG file. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 20170502
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=1959911
Restart Required: No
Instructions:
1. Check current dmg2img version. 2. Update to latest version from official repository. 3. Recompile if using source. 4. Verify fix with test DMG files.
🔧 Temporary Workarounds
Avoid processing untrusted DMG files
allDo not use dmg2img on DMG files from untrusted sources.
🧯 If You Can't Patch
- Remove dmg2img from systems where it's not essential
- Implement strict file validation and only process DMG files from trusted sources
🔍 How to Verify
Check if Vulnerable:
Check dmg2img version: dmg2img --version | grep -q '20170502' && echo 'VULNERABLE'Check Version:
dmg2img --versionVerify Fix Applied:
Ensure version is newer than 20170502: dmg2img --version📡 Detection & Monitoring
Log Indicators:
- Process crashes or abnormal termination of dmg2img
- Large memory allocation failures
Network Indicators:
- N/A - local utility
SIEM Query:
process.name='dmg2img' AND (event.action='crash' OR event.outcome='failure')