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Reachable Assertion Affecting openvswitch package, versions <2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1

Severity

 Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.54% (78th percentile)

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  • Snyk IDSNYK-DEBIAN11-OPENVSWITCH-527745
  • published25 Sept 2018
  • disclosed19 Sept 2018
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Introduced: 19 Sep 2018

CVE-2018-17205  (opens in a new tab)
CWE-617  (opens in a new tab)

How to fix?

Upgrade Debian:11 openvswitch to version 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openvswitch package and not the openvswitch package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order. If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries to revert back all previous flows that were successfully applied from the same bundle. This is possible since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.