Memory Exhaustion in FreeIPA via Large Request Body

Executive Summary

This is a denial-of-service (DoS) vulnerability in FreeIPA. A remote attacker can send an excessively large request to the /ipa/i18n_messages endpoint without authentication. The service reads the entire request body into memory without size limits, causing memory exhaustion, degraded performance, and potential system crashes.

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Detection Guidance

Monitor for unusually large POST requests to the /ipa/i18n_messages endpoint. Use network traffic analysis tools like tcpdump or Wireshark to inspect request sizes. Check Apache access logs for large payloads or repeated requests to this path.

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Impact Analysis

If exploited, this vulnerability can make FreeIPA services unresponsive or crash due to memory exhaustion. This disrupts authentication, user management, and other FreeIPA functions, leading to service outages and potential loss of access for users and systems relying on FreeIPA.

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Compliance Impact

This vulnerability could indirectly impact compliance with GDPR and HIPAA by causing service disruptions due to denial-of-service conditions. GDPR requires maintaining data processing integrity and availability, while HIPAA mandates continuous access to critical systems. A DoS attack may lead to prolonged downtime, potentially violating these requirements.

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Mitigation Strategies

Configure Apache to enforce a request-body limit for /ipa/i18n_messages using LimitRequestBody 1048576 (1MB). Restart httpd. If using a reverse proxy or load balancer, apply equivalent body-size limits. Alternatively, patch ipaserver/rpcserver.py to cap request body size in read_input().

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