Open vSwitch up to 2.7.6 lib/ofp-util.c input validation

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Open vSwitch up to 2.7.6. This affects an unknown function in the library lib/ofp-util.c. Executing a manipulation can lead to input validation. The identification of this vulnerability is CVE-2018-17204. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Open vSwitch up to 2.7.6. This vulnerability affects an unknown function in the library lib/ofp-util.c. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting parse_group_prop_ntr_selection_method in lib/ofp-util.c. When decoding a group mod, it validates the group type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tries to use the type and command earlier, when it might still be invalid. This causes an assertion failure (via OVS_NOT_REACHED). ovs-vswitchd does not enable support for OpenFlow 1.5 by default.

The bug was discovered 07/06/2018. The weakness was shared 09/19/2018 (Website). The advisory is shared for download at github.com. This vulnerability was named CVE-2018-17204 since 09/19/2018. The exploitation appears to be easy. The attack can be initiated remotely. The successful exploitation requires a single authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 75 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118745 (RHEL 7 : openvswitch (RHSA-2018:3500)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171775 (SUSE Enterprise Linux Security Update for openvswitch (SUSE-SU-2018:4128-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118745). The entries VDB-124265 and VDB-124266 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.3
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 118745
Nessus Name: RHEL 7 : openvswitch (RHSA-2018:3500)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: github.com

Timelineinfo

07/06/2018 🔍
09/19/2018 +74 days 🔍
09/19/2018 +0 days 🔍
09/19/2018 +0 days 🔍
09/20/2018 +1 days 🔍
11/05/2018 +46 days 🔍
11/06/2018 +1 days 🔍
05/17/2023 +1653 days 🔍

Sourcesinfo

Advisory: RHSA-2018:3500
Status: Confirmed

CVE: CVE-2018-17204 (🔍)
GCVE (CVE): GCVE-0-2018-17204
GCVE (VulDB): GCVE-100-124264
See also: 🔍

Entryinfo

Created: 09/20/2018 08:19
Updated: 05/17/2023 09:52
Changes: 09/20/2018 08:19 (70), 03/25/2020 12:33 (3), 05/17/2023 09:52 (5)
Complete: 🔍
Cache ID: 216::103

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