#VU75512 Improper Authorization in etcd - CVE-2021-28235

Vulnerability identifier: #VU75512

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-28235

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
etcd
Server applications / Database software

Vendor: etcd-io

Description

The vulnerability allows a remote attacker to compromise the system.

The vulnerability exists due to missing authorization to the "/debug" feature. A remote non-authenticated attacker can access the "/debug/requests" endpoint and gain unauthorized access to the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

etcd: 3.4.0 - 3.5.7

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External links
https://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj.png
https://github.com/lucyxss/etcd-3.4.10-test/blob/master/temp4cj_2.png
https://github.com/etcd-io/etcd/pull/15648

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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