Infinite loop in envoy



| Updated: 2020-08-08
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-18836
CWE-ID CWE-835
Exploitation vector Network
Public exploit N/A
Vulnerable software
 envoy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Cloud Native Computing Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Infinite loop

EUVDB-ID: #VU35101

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-2019-18836

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

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

CPE2.3 External links

https://blog.envoyproxy.io
https://github.com/envoyproxy/envoy/security/advisories/GHSA-3xvf-4396-cj46
https://github.com/istio/istio/issues/18229
https://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.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



###SIDEBAR###