Improper Authentication in Istio

1) Improper Authentication

EUVDB-ID: #VU25385

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-2020-8595

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in the Authentication Policy exact-path matching logic. A remote attacker can bypass authentication process and gain unauthorized access to HTTP paths even if they are configured to be only accessed after presenting a valid JWT token.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Istio: 1.3 - 1.4.3

CPE2.3

• cpe:2.3:a:istio:istio:1.3:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.4:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.5:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.6:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.3.7:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.4:*:*:*:*:*:*:*
• cpe:2.3:a:istio:istio:1.4.1:*:*:*:*:*:*:*

External links

https://access.redhat.com/errata/RHSA-2020:0477
https://access.redhat.com/security/cve/cve-2020-8595
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-8595
https://github.com/istio/istio/commits/master
https://istio.io/news/security/
https://istio.io/news/security/istio-security-2020-001/

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.