Impact: Important Public Date: 2019-08-28 CWE: CWE-400 Bugzilla: 1739292: CVE-2019-10222 ceph: Unauthenticated clients can crash ceph RGW configured with beast as frontend A flaw was found in the Ceph RGW configuration with Beast as the front end handling client requests. An unauthenticated attacker could crash the Ceph RGW server by sending valid HTTP headers and terminating the connection, resulting in a remote denial of service for Ceph RGW clients.
Find out more about CVE-2019-10222 from the MITRE CVE dictionary dictionary and NIST NVD.
Red Hat OpenStack Platform 13 included some Ceph components at release for in order to support ppc64le. The version provided in the OpenStack repositories is outdated and customers are expected to be using versions provided in Ceph repositories now. Additionally, only the client side and libraries were included which are not affected by this vulnerability.
NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.
| CVSS3 Base Score | 7.5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity Impact | None |
| Availability Impact | High |
| Platform | Package | State |
|---|---|---|
| Red Hat OpenStack Platform 13.0 (Queens) | ceph | Not affected |
| Red Hat Enterprise Linux 8 | ceph | Not affected |
| Red Hat Enterprise Linux 7 | ceph-common | Not affected |
| Red Hat Ceph Storage 3 | ceph | Affected |
| Red Hat Ceph Storage 2 | ceph | Not affected |
To mitigate this issue either of the following options can be applied to system:
Mitigation 1:
1. By default system will use /etc/init.d/ceph-radosgw
stop this service by
~]# /etc/init.d/ceph-radosgw stop
2. Create systemd service, and change command line parameters according to the environment
where Ceph radosgw is running.
~]# cat /usr/lib/systemd/system/ceph-rgw.service
[Unit]
Description=Ceph RGW daemon
[Service]
Type=forking
ExecStart=/bin/radosgw -n client.rgw.$(HOSTNAME REDACTED)
Restart=on-abnormal
RestartSec=1s
[Install]
WantedBy=multi-user.target
3. Run systemd service 'ceph-rgw.service'
Caveat: It still takes +1-2 sec to get service back online. After applying above mentioned mitigation, the malicious IP can be blocked by a firewall rule if there are continuous attempts to launch remote denial of service. This mitigation is of limited use if the attack is launched from multiple IPs. It is recommended to limit the exposure of ceph RGW server to known clients.
OR
Mitigation 2:
use 'civetweb' as HTTP frontend with ceph RGW.
Vulmon