CVE-2023-41056
📋 TL;DR
This CVE describes an integer overflow vulnerability in Redis memory buffer resizing that can lead to heap overflow and potential remote code execution. Attackers could exploit this to execute arbitrary code on vulnerable Redis servers. All Redis deployments running affected versions are potentially vulnerable.
💻 Affected Systems
- Redis
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Redis by Redis
Redis by Redis
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full control of Redis server, executes arbitrary code, and potentially pivots to other systems in the network.
Likely Case
Remote code execution leading to data theft, service disruption, or cryptocurrency mining malware installation.
If Mitigated
Denial of service or application crash if exploit fails or controls limit impact.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to Redis server.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.0.15 or 7.2.4
Vendor Advisory: https://github.com/redis/redis/security/advisories/GHSA-xr47-pcmx-fq2m
Restart Required: Yes
Instructions:
1. Stop Redis service. 2. Backup data and configuration. 3. Upgrade Redis to version 7.0.15 or 7.2.4. 4. Restart Redis service. 5. Verify service is running correctly.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict Redis access to trusted networks only using firewall rules.
iptables -A INPUT -p tcp --dport 6379 -s trusted_ip_range -j ACCEPT
iptables -A INPUT -p tcp --dport 6379 -j DROP
Redis Authentication
allEnable Redis authentication to require password for connections.
redis-cli CONFIG SET requirepass "strong_password"
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit Redis access
- Deploy Redis behind a reverse proxy with request validation and rate limiting
🔍 How to Verify
Check if Vulnerable:
Check Redis version using redis-cli or redis-server --versionCheck Version:
redis-server --versionVerify Fix Applied:
Confirm Redis version is 7.0.15 or 7.2.4 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual memory allocation patterns
- Redis process crashes
- Suspicious command sequences
Network Indicators:
- Unusual traffic patterns to Redis port 6379
- Large or malformed Redis protocol requests
SIEM Query:
source="redis.log" AND ("segmentation fault" OR "out of memory" OR "buffer overflow")🔗 References
- https://github.com/redis/redis/releases/tag/7.0.15
- https://github.com/redis/redis/releases/tag/7.2.4
- https://github.com/redis/redis/security/advisories/GHSA-xr47-pcmx-fq2m
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3JTGQJ2YLYB24B72I5B5H32YIMPVSWIT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTWHPLC3RI67VNRDOIXLDVNC5YMYBMQN/
- https://security.netapp.com/advisory/ntap-20240223-0003/
- https://github.com/redis/redis/releases/tag/7.0.15
- https://github.com/redis/redis/releases/tag/7.2.4
- https://github.com/redis/redis/security/advisories/GHSA-xr47-pcmx-fq2m
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3JTGQJ2YLYB24B72I5B5H32YIMPVSWIT/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTWHPLC3RI67VNRDOIXLDVNC5YMYBMQN/
- https://security.netapp.com/advisory/ntap-20240223-0003/
