Authentication bypass in Ceph

1) Authentication bypass using an alternate path or channel

EUVDB-ID: #VU48684

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

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

External links

http://bugzilla.redhat.com/show_bug.cgi?id=1890354
http://ceph.io/community/v15-2-6-octopus-released/
http://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.