CVE-2022-1534
📋 TL;DR
CVE-2022-1534 is a buffer over-read vulnerability in libmobi's parse_rawml.c that allows reading memory beyond allocated buffers. This can lead to information disclosure or application crashes. Anyone using libmobi to process MOBI eBook files is potentially affected.
💻 Affected Systems
- libmobi
📦 What is this software?
Libmobi by Libmobi Project
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive information from memory, potentially exposing credentials, keys, or other confidential data, leading to further system compromise.
Likely Case
Application crash (denial of service) or limited information disclosure from adjacent memory regions.
If Mitigated
With proper input validation and memory protections, impact is limited to application instability without data compromise.
🎯 Exploit Status
Exploitation requires crafting a malicious MOBI file. Public proof-of-concept exists in the commit reference.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.11 and later
Vendor Advisory: https://github.com/bfabiszewski/libmobi/commit/fb1ab50e448ddbed746fd27ae07469bc506d838b
Restart Required: Yes
Instructions:
1. Update libmobi to version 0.11 or later. 2. Recompile any applications using libmobi. 3. Restart affected services.
🔧 Temporary Workarounds
Input validation
allImplement strict validation of MOBI file inputs before processing
Memory protection
linuxEnable ASLR and other memory protection mechanisms
echo 2 > /proc/sys/kernel/randomize_va_space
🧯 If You Can't Patch
- Restrict upload/processing of MOBI files to trusted sources only
- Isolate libmobi processes in containers or sandboxes
🔍 How to Verify
Check if Vulnerable:
Check libmobi version: if < 0.11, vulnerableCheck Version:
pkg-config --modversion libmobi 2>/dev/null || echo 'Check application dependencies'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
Network Indicators:
- Unusual MOBI file uploads to web services
SIEM Query:
process_name:"libmobi" AND (event_type:crash OR error_message:"buffer over-read")🔗 References
- https://github.com/bfabiszewski/libmobi/commit/fb1ab50e448ddbed746fd27ae07469bc506d838b
- https://huntr.dev/bounties/9a90ffa1-38f5-4685-9c00-68ba9068ce3d
- https://github.com/bfabiszewski/libmobi/commit/fb1ab50e448ddbed746fd27ae07469bc506d838b
- https://huntr.dev/bounties/9a90ffa1-38f5-4685-9c00-68ba9068ce3d
