Apache Kerby Stack Overflow Denial of Service Vulnerability

Executive Summary

This vulnerability occurs when a deeply nested ASN1 structure is sent to an Apache Kerby client or service. The deeply nested structure can trigger a StackOverflow Exception.

This exception can cause the affected service or client to crash or become unresponsive.

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Detection Guidance

This vulnerability can be detected by monitoring for crashes or stack overflow exceptions in Apache Kerby clients or services when they process ASN1 data.

Since the issue is triggered by sending deeply nested ASN1 structures, detection can involve sending test ASN1 payloads designed to replicate the exploit conditions and observing if the service crashes or throws stack overflow exceptions.

No specific detection commands or tools are provided in the available resources.

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Impact Analysis

The primary impact of this vulnerability is a denial of service condition.

An attacker could exploit this by sending a specially crafted deeply nested ASN1 structure to cause the Apache Kerby client or service to crash or stop functioning properly.

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Compliance Impact

This vulnerability causes a denial of service (DoS) condition by triggering a StackOverflow Exception in Apache Kerby clients or services. While it impacts availability, it does not directly affect confidentiality or integrity of data.

Since the vulnerability does not lead to data breaches or unauthorized access, its impact on compliance with standards like GDPR or HIPAA—which focus heavily on data protection and privacy—is limited to potential availability concerns.

Organizations relying on Apache Kerby should consider that denial of service incidents could affect system availability requirements under these regulations, but there is no direct indication that this vulnerability compromises personal or protected health information.

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Mitigation Strategies

To mitigate this vulnerability, users are recommended to upgrade to Apache Kerby version 2.1.2, which contains the fix for the issue.

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