Explore the impact of CVE-2021-21266, an XXE vulnerability in OpenHAB that could expose sensitive data to attackers. Learn about mitigation steps and essential security practices.
OpenHAB, a vendor and technology agnostic open source home automation software, was found to be vulnerable to XML external entity (XXE) attacks in versions 2.5.12 and 3.0.1. Attackers on the same network could exploit this vulnerability to retrieve internal information, posing a risk to system integrity. The issue has been addressed in versions 2.5.12 and 3.0.1 through enhanced XML parser configurations.
Understanding CVE-2021-21266
This section provides an insight into the nature and impact of the XXE vulnerability in OpenHAB.
What is CVE-2021-21266?
The XXE vulnerability in OpenHAB allowed attackers within the same network to execute XML external entity attacks, potentially leading to unauthorized access to internal information.
The Impact of CVE-2021-21266
The vulnerability could be exploited to retrieve sensitive data from the file system, especially in responses to SSDP requests. Various add-ons parsing XML input were at risk, including AvmFritz, BoseSoundtouch, DenonMarantz, and others.
Technical Details of CVE-2021-21266
Delve into the specifics of the vulnerability, affected systems, and exploitation mechanism.
Vulnerability Description
The vulnerability stems from improper handling of XML external entities in OpenHAB versions 2.5.12 and 3.0.1, allowing malicious actors to exploit the system through SAX or JAXB parsing.
Affected Systems and Versions
OpenHAB versions prior to 2.5.12 and 3.0.1 are affected by this vulnerability, particularly impacting add-ons like AvmFritz, BoseSoundtouch, and other listed services.
Exploitation Mechanism
Attackers on the same network as the OpenHAB instance could leverage the XXE vulnerability to extract internal data, menacing system confidentiality.
Mitigation and Prevention
Discover the measures to mitigate the risk posed by CVE-2021-21266 and prevent future exploitation.
Immediate Steps to Take
Users of affected OpenHAB versions should update to versions 2.5.12 or 3.0.1 immediately to shield against potential XXE attacks.
Long-Term Security Practices
Incorporating strict XML parser configurations and regularly updating the software are essential for maintaining system security.
Patching and Updates
Regularly check for patches and updates from OpenHAB to ensure the latest security fixes are applied.