CVE-2024-47866 – This vulnerability in Ceph's RGW (RADOS Gateway... (How to Fix)

📋 TL;DR

This vulnerability in Ceph's RGW (RADOS Gateway) allows attackers to cause a denial-of-service by sending a specific S3 API request with an empty string in the x-amz-copy-source header. All Ceph deployments using RGW up to version 19.2.3 are affected, potentially disrupting object storage services.

💻 Affected Systems

Products:

Ceph RADOS Gateway (RGW)

Versions: All versions up to and including 19.2.3

Operating Systems: All operating systems running Ceph RGW

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects deployments using RGW (object storage gateway). Block and file storage components are not affected.

📦 What is this software?

Ceph by Redhat

View all CVEs affecting Ceph →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete unavailability of RGW services across the Ceph cluster, disrupting all object storage operations until daemons are manually restarted.

🟠

Likely Case

Intermittent RGW daemon crashes affecting availability of object storage services, requiring manual intervention to restore functionality.

🟢

If Mitigated

Minimal impact if RGW services are behind load balancers with health checks and automatic restart capabilities.

🌐 Internet-Facing: HIGH - RGW is typically exposed to handle S3 API requests, making internet-facing deployments particularly vulnerable to DoS attacks.

🏢 Internal Only: MEDIUM - Internal attackers or compromised systems could still trigger the crash, but attack surface is reduced compared to internet exposure.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires only a single HTTP request with specific headers, making it trivial to weaponize once details are understood.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Not yet available

Vendor Advisory: https://github.com/ceph/ceph/security/advisories/GHSA-mgrm-g92q-f8h8

Restart Required: Yes

Instructions:

1. Monitor Ceph security advisories for patch release
2. Apply patch when available
3. Restart RGW daemons after patching

🔧 Temporary Workarounds

API Gateway Filtering

all

Configure API gateway or load balancer to filter requests containing x-amz-copy-source header with empty string value

RGW Process Monitoring

linux

Implement automatic restart of RGW daemons when crashes are detected

systemctl enable ceph-radosgw@rgw.$(hostname -s).service
systemctl start ceph-radosgw@rgw.$(hostname -s).service

🧯 If You Can't Patch

Implement network-level filtering to block malicious requests at load balancer or firewall
Deploy RGW behind reverse proxy with request validation and rate limiting

🔍 How to Verify

Check if Vulnerable:

Check Ceph version: ceph version | grep 'ceph version' and verify if version is 19.2.3 or earlier

Check Version:

ceph version

Verify Fix Applied:

After patch is released, verify version is greater than 19.2.3 and test with crafted request containing empty x-amz-copy-source header

📡 Detection & Monitoring

Log Indicators:

RGW daemon crash logs in /var/log/ceph/
Segmentation fault errors in system logs
Increased RGW process restarts

Network Indicators:

HTTP requests with x-amz-copy-source: "" header
Sudden drop in RGW service availability

SIEM Query:

source="ceph.logs" AND ("segmentation fault" OR "rgw crash" OR "SIGSEGV")

📊 Metadata

CVE ID: CVE-2024-47866

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-20

EPSS Score: 0.16% exploit probability (37.3th percentile)

Published: November 12, 2025

Last Updated: December 31, 2025

🔗 References

https://github.com/ceph/ceph/security/advisories/GHSA-mgrm-g92q-f8h8 Exploit,Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/11/11/3 Mailing List
https://github.com/ceph/ceph/security/advisories/GHSA-mgrm-g92q-f8h8 Exploit,Vendor Advisory

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