Denial of Service in Netty Redis Codec

Executive Summary

This vulnerability exists in the netty-codec-redis component of the Netty framework prior to versions 4.1.135.Final and 4.2.15.Final. An attacker can exploit it by sending a specially crafted Redis payload containing deeply nested arrays. This causes the server to allocate an excessive number of state objects and collections, which leads to memory exhaustion and ultimately triggers an OutOfMemoryError.

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Impact Analysis

The primary impact of this vulnerability is a Denial of Service (DoS) condition. By exploiting it, an attacker can cause the affected server to run out of memory and crash or become unresponsive. This disrupts normal service availability, potentially causing downtime and affecting users or dependent systems.

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Mitigation Strategies

To mitigate this vulnerability, upgrade netty-codec-redis to version 4.1.135.Final or 4.2.15.Final or later, as these versions contain the patch that fixes the issue.

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Detection Guidance

This vulnerability can be detected by monitoring for unusually high memory usage or OutOfMemoryError events in applications using vulnerable versions of the io.netty:netty-codec-redis package. Since the attack involves sending crafted Redis payloads with deeply nested arrays, network traffic analysis for such abnormal Redis commands may help identify exploitation attempts.

Specific commands to detect this vulnerability are not provided in the available resources. However, general approaches include:

• Monitoring application logs for OutOfMemoryError or memory exhaustion errors.
• Using network packet capture tools (e.g., tcpdump, Wireshark) to inspect Redis traffic for deeply nested array payloads.
• Employing Redis command logging or auditing features to detect suspiciously complex or deeply nested commands.

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