#VU76847 Missing Authorization in Consul and Consul Enterprise - CVE-2021-38698

Vulnerability identifier: #VU76847

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-38698

CWE-ID: CWE-862

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Consul
Server applications / Other server solutions
Consul Enterprise
Server applications / Other server solutions

Vendor: HashiCorp

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to Txn.Apply endpoint allowed services to register proxies for other services, enabling access to service traffic. A remote user can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Consul: before 1.8.15, 1.9.9, 1.10.2, 1.8.15, 1.8.15, 1.8.15

Consul Enterprise: before 1.8.15, 1.9.9, 1.10.2, 1.8.15, 1.8.15, 1.8.15

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External links
https://www.hashicorp.com/blog/category/consul
https://discuss.hashicorp.com/t/hcsec-2021-24-consul-missing-authorization-check-on-txn-apply-endpoint/29026
https://security.gentoo.org/glsa/202208-09

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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