#VU35101 Infinite loop in envoy


Published: 2019-11-11 | Updated: 2020-08-08

Vulnerability identifier: #VU35101

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18836

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
envoy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cloud Native Computing Foundation

Description

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

Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated by a single idle TCP connection being able to keep a worker thread in an infinite busy loop when continue_on_listener_filters_timeout is used."

Mitigation
Install update from vendor's website.

Vulnerable software versions

envoy: 1.12.0


External links
http://blog.envoyproxy.io
http://github.com/envoyproxy/envoy/security/advisories/GHSA-3xvf-4396-cj46
http://github.com/istio/istio/issues/18229
http://groups.google.com/forum/#!forum/envoy-users


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.


Latest bulletins with this vulnerability