Authentication bypass in Ceph

1) Authentication bypass using an alternate path or channel

EUVDB-ID: #VU48684

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-25660

CWE-ID: CWE-288 - Authentication Bypass Using an Alternate Path or Channel

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists with in the implementation of the Cephx authentication protocol. A remote attacker with access to the Ceph cluster network can intercept authentication packets and perform  replay attacks in Nautilus.

The vulnerability affects msgr2 protocol only and is basically a reintroduction of previously patched vulnerability #VU14542.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ceph: 14.0.0 - 15.2.5

CPE2.3

• cpe:2.3:a:red_hat:ceph:14.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:ceph:14.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:ceph:14.1.0:*:*:*:*:*:*:*

External links

https://bugzilla.redhat.com/show_bug.cgi?id=1890354
https://ceph.io/community/v15-2-6-octopus-released/
https://ceph.io/releases/v14-2-14-nautilus-released/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.