#VU30627 Infinite loop in Istio - CVE-2019-18817

Vulnerability identifier: #VU30627

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-18817

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Istio
Web applications / Other software

Vendor: Istio

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

Istio 1.3.x before 1.3.5 allows Denial of Service because continue_on_listener_filters_timeout is set to True, a related issue to CVE-2019-18836.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Istio: 1.3 - 1.3.4

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External links
https://github.com/istio/istio/issues/18229
https://istio.io/news/2019/announcing-1.3.5/

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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.