Bug 1949188 (CVE-2021-3499) - CVE-2021-3499 openshift/ovn-kubernetes: Egress Firewall does not reliably apply firewall rules
Summary: CVE-2021-3499 openshift/ovn-kubernetes: Egress Firewall does not reliably app...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-3499
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1947917 1949529 1949530 1987187
Blocks: 1948664 1949494
TreeView+ depends on / blocked
 
Reported: 2021-04-13 16:59 UTC by Przemyslaw Roguski
Modified: 2021-10-28 08:52 UTC (History)
9 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-10-28 08:52:21 UTC
Embargoed:

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Description Przemyslaw Roguski 2021-04-13 16:59:08 UTC 
It was found that Egress Firewall in OVN-Kubernetes does not reliably apply firewall rules when there is multiple dns rules.
When adding EgressFirewalls with 5 or so dnsNames it is probable that a deadlock will occur.
It could lead to the situation that effective firewall rules are different than it could be expected.
Comment 1 Przemyslaw Roguski 2021-04-13 16:59:11 UTC 
Acknowledgments:

Name: Michael Swenson (Red Hat)
Comment 2 Przemyslaw Roguski 2021-04-13 17:10:04 UTC 
Statement:

In OpenShift Container Platform 4 the default Container Network Interface (CNI) network provider plug-in is OpenShift SDN, and it's not affected by this flaw. Only the OVN-Kubernetes CNI network provider is affected.
Comment 5 Przemyslaw Roguski 2021-04-14 19:38:06 UTC 
upstream PR:
https://github.com/ovn-org/ovn-kubernetes/pull/2169
Comment 6 Mark Cooper 2021-06-24 02:14:40 UTC 
Used fixcvename on RHBA-2021:1550

This was fixed in 4.7.10 but only shipped in 4.7.11 with container ose-ovn-kubernetes-container-v4.7.0-202105071917.p0
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