CVE-2024-1481: FreeIPA Command Injection DOS Vulnerability

CVE-2024-1481 Overview

CVE-2024-1481 is an input validation flaw in FreeIPA, an integrated identity and authentication solution for Linux/UNIX environments. A remote attacker can craft an HTTP request containing parameters that are interpreted as command-line arguments to the kinit utility on the FreeIPA server. When the server passes these parameters to kinit without proper sanitization, the process can be manipulated into a state that disrupts availability. The vulnerability is tracked under CWE-20: Improper Input Validation and results in a denial of service condition against the FreeIPA server. No authentication is required to trigger the flaw.

Critical Impact
Unauthenticated remote attackers can send crafted HTTP requests to disrupt Kerberos initialization on FreeIPA servers, causing denial of service against identity and authentication infrastructure.

Affected Products

FreeIPA (upstream identity management project)
Red Hat Enterprise Linux distributions shipping FreeIPA (see RHSA-2024:2147 and RHSA-2024:3044)
Fedora and Debian LTS distributions shipping FreeIPA packages

Discovery Timeline

2024-04-10 - CVE-2024-1481 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-1481

Vulnerability Analysis

FreeIPA exposes management and authentication endpoints over HTTP. Certain request handlers invoke the Kerberos client tool kinit to obtain or validate tickets on behalf of the request. The affected code paths forward attacker-controlled values from HTTP request parameters into the kinit invocation without filtering characters that kinit treats as option flags or arguments.

Because kinit accepts a variety of options that alter its behavior, attacker-supplied strings can be interpreted as command arguments rather than as data. The resulting invocation causes kinit to enter states that consume resources or fail in ways that impact the FreeIPA service. The flaw does not permit disclosure or modification of stored data; the impact is limited to availability of the FreeIPA server.

Root Cause

The root cause is improper input validation [CWE-20]. Request parameter values are concatenated or passed into the kinit command line without a strict allowlist or argument-terminator handling. FreeIPA does not distinguish between values intended as principals or credentials and values that begin with flag prefixes recognized by kinit.

Attack Vector

Exploitation requires only network access to the FreeIPA HTTP endpoint. An unauthenticated attacker crafts an HTTP request in which one or more parameters contain strings that kinit parses as options. Repeated or resource-intensive invocations degrade the FreeIPA service, preventing legitimate authentication and identity management operations.

No verified exploit code is publicly available. For technical details of the fix, see the Red Hat CVE summary and Red Hat Bugzilla #2262169.

Detection Methods for CVE-2024-1481

Indicators of Compromise

Unusual spikes in kinit process invocations on FreeIPA servers, particularly with unexpected command-line flags.
HTTP requests to FreeIPA endpoints containing parameter values starting with - or -- characters that resemble kinit option syntax.
FreeIPA service errors, worker restarts, or increased HTTP 5xx responses correlated with malformed request patterns.

Detection Strategies

Inspect Apache HTTPD access logs on FreeIPA servers for query strings and POST bodies containing option-like tokens targeting authentication endpoints.
Monitor process telemetry for kinit executions spawned by the FreeIPA HTTP worker with anomalous argument patterns.
Correlate FreeIPA service availability metrics with inbound HTTP request patterns to identify DoS attempts.

Monitoring Recommendations

Enable verbose logging on httpd and FreeIPA framework components to capture request parameters passed to backend commands.
Forward FreeIPA and system logs to a centralized SIEM for pattern-based alerting on malformed authentication requests.
Track CPU, memory, and process-count metrics on FreeIPA servers with alerting thresholds tied to sustained abnormal load.

How to Mitigate CVE-2024-1481

Immediate Actions Required

Apply vendor-supplied FreeIPA package updates from your Linux distribution as the primary remediation.
For Red Hat Enterprise Linux systems, install the updates referenced in RHSA-2024:2147 and RHSA-2024:3044.
Restrict network exposure of FreeIPA HTTP endpoints to trusted management networks and clients where operationally feasible.
Review Apache and FreeIPA logs for prior evidence of crafted requests targeting authentication endpoints.

Patch Information

Patched FreeIPA packages are available through distribution security advisories. Red Hat has published fixes in RHSA-2024:2147 and RHSA-2024:3044. Debian LTS users should refer to the Debian LTS announcement, and Fedora users should consult the Fedora package announcement. Verify the installed FreeIPA package version matches or exceeds the fixed version listed in the advisory for your distribution.

Workarounds

Place a reverse proxy or web application firewall in front of FreeIPA HTTP endpoints to filter request parameters that begin with - or --.
Apply rate limiting on authentication-related URIs to reduce the impact of repeated DoS attempts pending patch deployment.
Restrict access to FreeIPA management interfaces using host-based firewalls or network segmentation until updates are applied.

bash

# Configuration example: verify installed FreeIPA version and apply updates
rpm -q ipa-server freeipa-server 2>/dev/null

# Red Hat / Fedora
sudo dnf update ipa-server ipa-client

# Debian / Ubuntu
sudo apt-get update && sudo apt-get install --only-upgrade freeipa-server freeipa-client

# Restart the FreeIPA service after patching
sudo ipactl restart