CVE-2021-21266 Information

Description

openHAB is a vendor and technology agnostic open source automation software for your home. In openHAB before versions 2.5.12 and 3.0.1 the XML external entity (XXE) attack allows attackers in the same network as the openHAB instance to retrieve internal information like the content of files from the file system. Responses to SSDP requests can be especially malicious. All add-ons that use SAX or JAXB parsing of externally received XML are potentially subject to this kind of attack. In openHAB the following add-ons are potentially impacted: AvmFritz BoseSoundtouch DenonMarantz DLinkSmarthome Enigma2 FmiWeather FSInternetRadio Gce Homematic HPPrinter IHC Insteon Onkyo Roku SamsungTV Sonos Roku Tellstick TR064 UPnPControl Vitotronic Wemo YamahaReceiver and XPath Tranformation. The vulnerabilities have been fixed in versions 2.5.12 and 3.0.1 by a more strict configuration of the used XML parser.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Reference

https://github.com/openhab/openhab-addons/security/advisories/GHSA-r2hc-pmr7-4c9r https://www.contrastsecurity.com/security-influencers/xml-xxe-pitfalls-with-jaxb https://dev.to/brianverm/configure-your-java-xml-parsers-to-prevent-xxe-213c https://github.com/openhab/openhab-addons/commit/81935b0ab126e6d9aebd2f6c3fc67d82bb7e8b86

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.0