Bug 1770956 (CVE-2019-18817)

Summary: CVE-2019-18817 istio/envoy: infinite loop in Envoy, and subsequently Istio leads to a DoS
Product: [Other] Security Response Reporter: Marian Rehak <mrehak>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: kconner, rcernich, twalsh
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in envoy. When the option `continue_on_listener_filters_timeout` is set to True, an infinite loop can be triggered that could effectively exhaust Envoy's CPU resources causing a denial of service. The highest threat from this vulnerability is to system availability.
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Last Closed: 2019-11-11 18:51:14 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Marian Rehak 2019-11-11 14:54:59 UTC
An infinite loop can be triggered in Envoy if the option continue_on_listener_filters_timeout is set to True. This has been the case for Istio since the introduction of the Protocol Detection feature in Istio 1.3 A remote attacker may trivially trigger that vulnerability, effectively exhausting Envoy’s CPU resources and causing a denial-of-service attack.

Comment 1 Marian Rehak 2019-11-11 14:55:24 UTC
Upstream advisory:

https://istio.io/news/2019/istio-security-2019-006/

Comment 2 Product Security DevOps Team 2019-11-11 18:51:14 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-18817

Comment 3 Eric Christensen 2020-05-05 15:57:02 UTC
External References:

https://istio.io/news/2019/istio-security-2019-006/