CVE-2022-1908
📋 TL;DR
CVE-2022-1908 is a buffer over-read vulnerability in libmobi library versions prior to 0.11 that allows reading beyond allocated memory boundaries when processing malicious MOBI ebook files. This affects any application using vulnerable libmobi versions to parse MOBI files, potentially exposing sensitive memory contents. Attackers could exploit this by tricking users into opening specially crafted MOBI files.
💻 Affected Systems
- libmobi
- Applications using libmobi for MOBI file processing
📦 What is this software?
Libmobi by Libmobi Project
⚠️ Risk & Real-World Impact
Worst Case
Information disclosure of sensitive memory contents including passwords, keys, or other application data, potentially leading to full system compromise if combined with other vulnerabilities.
Likely Case
Application crash (denial of service) or limited information disclosure from the application's memory space.
If Mitigated
Application crash with no data loss if proper memory protections (ASLR, DEP) are enabled.
🎯 Exploit Status
Exploitation requires user interaction to open a malicious MOBI file. Proof-of-concept available in public bounty reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.11 and later
Vendor Advisory: https://github.com/bfabiszewski/libmobi/commit/1e0378e6f9e4ae415cedc9eb10850888897c5dba
Restart Required: No
Instructions:
1. Update libmobi to version 0.11 or later. 2. Recompile any applications using libmobi with the updated library. 3. Replace existing libmobi installations with patched version.
🔧 Temporary Workarounds
Disable MOBI file processing
allPrevent applications from processing MOBI files if not required
Use file type restrictions
allConfigure applications to reject MOBI files from untrusted sources
🧯 If You Can't Patch
- Implement strict file upload validation to block MOBI files from untrusted sources
- Deploy memory protection mechanisms (ASLR, DEP) to reduce impact
🔍 How to Verify
Check if Vulnerable:
Check libmobi version: 'mobi_version' command or check library version in application dependenciesCheck Version:
mobi_version 2>/dev/null || echo "Check application dependencies for libmobi version"Verify Fix Applied:
Verify libmobi version is 0.11 or later and test with known malicious MOBI files📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing MOBI files
- Memory access violation errors in application logs
Network Indicators:
- MOBI file downloads from suspicious sources
SIEM Query:
source="application.log" AND ("segmentation fault" OR "access violation") AND "mobi"🔗 References
- https://github.com/bfabiszewski/libmobi/commit/1e0378e6f9e4ae415cedc9eb10850888897c5dba
- https://huntr.dev/bounties/a7436e88-0488-4bd4-816f-2e2c803e93e8
- https://github.com/bfabiszewski/libmobi/commit/1e0378e6f9e4ae415cedc9eb10850888897c5dba
- https://huntr.dev/bounties/a7436e88-0488-4bd4-816f-2e2c803e93e8
