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Bug 1632528 - (CVE-2018-17206) CVE-2018-17206 openvswitch: Buffer over-read in lib/ofp-actions.c:decode_bundle()
CVE-2018-17206 openvswitch: Buffer over-read in lib/ofp-actions.c:decode_bund...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180925,repor...
: Security
Depends On: 1632529 1633049 1633052 1633053 1633054 1633055 1633056 1633057 1633050 1633051
Blocks: 1632524
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Reported: 2018-09-24 21:55 EDT by Sam Fowler
Modified: 2018-10-08 17:59 EDT (History)
44 users (show)

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Fixed In Version:
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Doc Text:
An issue was discovered in Open vSwitch (OvS) 2.5.x through 2.5.5, 2.6.x through 2.6.3, 2.7.x through 2.7.6, 2.8.x through 2.8.4, and 2.9.x through 2.9.2 where the decode_bundle function inside lib/ofp-actions.c is affected by a buffer over-read issue during BUNDLE action decoding. A specially crafted flow update applied using the bundling feature of Open vSwitch could potentially cause a crash leading to a denial of service.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Github openvswitch/ovs/commit/9237a63c47bd314b807cda0bd2216264e82edbe8 None None None 2018-09-26 22:25 EDT

  None (edit)
Description Sam Fowler 2018-09-24 21:55:35 EDT 
An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6. The decode_bundle function inside lib/ofp-actions.c is affected by a buffer over-read issue during BUNDLE action decoding.


Upstream Patch:

https://nvd.nist.gov/vuln/detail/CVE-2018-17206
Comment 1 Sam Fowler 2018-09-24 21:56:16 EDT 
Created openvswitch tracking bugs for this issue:

Affects: openstack-rdo [bug 1632529]
Comment 2 James Hebden 2018-09-26 02:32:41 EDT 
I have downgraded the severity after review. This crash would be possible when bundling changes to the OVS flow table, which requires use of the local ovs-vsctl tool by a logged in administrative user, so network and unprivileged didn't quite seem to fit.

I have updated the flaw RHOSP edition impacts after reviewing both RHOSP and FDP releases, including the FDP openvswitch2.10 release.

RHOSP14 (OVS 2.6.1):
openvswitch:
 - CVE-2018-17206 (vulnerable code present in decode_bundle, lib/ofp-actions.c, offset)

RHOSP13 (OVS 2.6.1)
openvswitch:
 - CVE-2018-17206 (vulnerable code present in decode_bundle, lib/ofp-actions.c, offset)
 - Commonly uses FDP version (2.9.0)

RHOSP12 (OVS 2.7.4)
openvswitch:
 - CVE-2018-17206 (vulnerable code present in decode_bundle, lib/ofp-actions.c, offset)
 - Commonly uses FDP version (2.9.0)

RHOSP10 (OVS 2.6.1)
openvswitch:
 - CVE-2018-17206 (vulnerable code present in decode_bundle, lib/ofp-actions.c, offset)
 - Commonly uses FDP version (2.9.0)

RHOSP9 (OVS not packaged?)
openvswitch:
 - Repo contains 2.5.0 (Installable after running rhos-release 9, seems to inherit from RHOS7 tag)
 - CVE-2018-17206 (vulnerable code present in decode_bundle, in lib/ofp-actions.c)

RHOSP8 (OVS not packaged?)
openvswitch:
 - Repo contains 2.5.0 (Installable after running rhos-release 8, seems to inherit from RHOS7 tag)
 - CVE-2018-17206 (vulnerable code present in decode_bundle, in lib/ofp-actions.c)

RHOSP7 ELS (Important flaws only for ELS releases, 2.5.0)
 - CVE-2018-17206 (vulnerable code present in decode_bundle, in lib/ofp-actions.c, however not high enough severity to meet criteria for ELS)

Fast Data Path RHEL-7 (2.9.0)
openvswitch:
 - CVE-2018-17206 (vulnerable code present in decode_bundle, lib/ofp-actions.c, offset)
openvswitch2.10:
 - CVE-2018-17206 (has been fixed, not vulnerable)
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