VDB-168992 · CVE-2021-21266 · GCVE-0-2021-21266

openHAB up to 2.5.11/3.0.0 xml external entity reference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in openHAB up to 2.5.11/3.0.0. Affected is an unknown function. Such manipulation leads to xml external entity reference. This vulnerability is uniquely identified as CVE-2021-21266. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in openHAB up to 2.5.11/3.0.0. It has been rated as critical. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 02/02/2021. The advisory is shared for download at contrastsecurity.com. This vulnerability is handled as CVE-2021-21266. There are neither technical details nor an exploit publicly available.

Upgrading to version 2.5.12 or 3.0.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

openHAB

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.0
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Xml external entity reference
CWE: CWE-611 / CWE-610
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: openHAB 2.5.12/3.0.1
Patch: github.com

Timelineinfo

12/22/2020 🔍
02/02/2021 +42 days 🔍
02/02/2021 +0 days 🔍
02/22/2021 +20 days 🔍

Sourcesinfo

Advisory: contrastsecurity.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-21266 (🔍)
GCVE (CVE): GCVE-0-2021-21266
GCVE (VulDB): GCVE-100-168992

Entryinfo

Created: 02/02/2021 10:31
Updated: 02/22/2021 06:33
Changes: 02/02/2021 10:31 (37), 02/22/2021 06:29 (5), 02/22/2021 06:33 (19)
Complete: 🔍
Cache ID: 216::103