Authentication bypass using an alternate path or channel in ceph (Alpine package)

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 update from vendor's website.

Vulnerable software versions

ceph (Alpine package): 14.2.1-r0 - 14.2.9-r1

CPE2.3

• cpe:2.3:o:alpine:ceph_alpine_package:14.2.1-r0:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:o:alpine:ceph_alpine_package:14.2.3-r0:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:o:alpine:ceph_alpine_package:14.2.4-r0:*:*:*:*:alpine_linux:*:3.10

External links

https://git.alpinelinux.org/aports/commit/?id=f76faad409e96ef9dd005c5ee843d4b3bf597450

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.