CVE-2023-42179 Overview
CVE-2023-42179 affects the Bird Home Automation GmbH D1101V-F device running firmware version 000140. The vulnerability stems from incorrect access control in the key derivation function (KDF) and the password validation process. Attackers can abuse these cryptographic weaknesses to bypass authentication controls on the affected IP door station. The flaw impacts smart-home and access-control deployments that rely on the DoorBird D1101V-F for entry authorization. Public technical analysis is available in an independent GitHub research repository.
Critical Impact
Weaknesses in the key derivation and password validation logic allow attackers to undermine authentication on the D1101V-F door station, potentially exposing physical access control to unauthorized users.
Affected Products
- Bird Home Automation GmbH D1101V-F firmware version 000140
- DoorBird D1101V-F IP video door station
- Deployments using the affected key derivation and password validation routines
Discovery Timeline
- 2026-08-26 - CVE-2023-42179 published to the National Vulnerability Database
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2023-42179
Vulnerability Analysis
The D1101V-F device implements a key derivation function and password validation routine that fail to enforce correct access control. The published research characterizes the issue as a cryptographic weakness that undermines the guarantees an authentication routine is expected to provide. Because the KDF and password check operate on the same authentication path, weaknesses in either primitive translate directly into an authentication bypass condition on the device.
DoorBird-branded devices act as network-connected entry points, exposing HTTP and API interfaces for door control and video streaming. A flaw in the authentication path therefore affects both administrative interfaces and downstream door-relay functions. The vendor product is manufactured by Bird Home Automation GmbH and marketed under the DoorBird brand (vendor site).
Root Cause
The root cause is an incorrect access control defect in the cryptographic routines responsible for deriving keys from user credentials and validating submitted passwords. When a KDF is used improperly, or when the password comparison does not correctly bind derived material to an authenticated session, an attacker can produce inputs that the device accepts as valid. Technical details are documented in the DoorBird KDF vulnerability research.
Attack Vector
The attack vector has not been formally classified in the NVD record, and no CVSS metrics are published. Based on the device class, exploitation typically requires network reachability to the D1101V-F management or API endpoints. An attacker able to reach the device on the local network, or through an exposed remote-access path, can interact with the vulnerable authentication routines.
No verified public exploit code is referenced in the CVE record. See the referenced research repository for technical analysis of the KDF behavior.
Detection Methods for CVE-2023-42179
Indicators of Compromise
- Unexpected successful authentications to the D1101V-F web or API interfaces from unfamiliar source addresses.
- Door relay activations or configuration changes that do not correlate with known administrator activity.
- Anomalous outbound connections initiated by the device to hosts outside the vendor cloud infrastructure.
Detection Strategies
- Monitor network traffic to and from D1101V-F devices for authentication requests originating outside expected management subnets.
- Alert on repeated authentication attempts against the device API that could indicate credential brute-forcing against the weak KDF.
- Correlate physical access logs with network authentication events to identify door openings without a matching authenticated session.
Monitoring Recommendations
- Place DoorBird devices on a segmented VLAN and log all north-south traffic at the segment boundary.
- Forward device syslog and API access logs to a centralized analytics platform for retention and query.
- Baseline normal administrative access patterns and alert on deviations such as off-hours logins or new client fingerprints.
How to Mitigate CVE-2023-42179
Immediate Actions Required
- Inventory all Bird Home Automation D1101V-F devices and confirm firmware versions, prioritizing any device running 000140.
- Restrict network access to the device management and API interfaces to trusted administrative hosts only.
- Rotate device passwords and any shared credentials that may have been derived using the affected KDF.
- Disable remote internet exposure of the device where not strictly required.
Patch Information
No vendor patch is referenced in the CVE record at the time of publication. Administrators should consult the Bird Home Automation site for firmware updates addressing the key derivation and password validation defects, and apply updates as soon as they become available.
Workarounds
- Isolate D1101V-F devices on a dedicated IoT VLAN with strict egress filtering.
- Require VPN or zero-trust network access for any remote administration of the device.
- Enforce strong, unique administrative passwords to reduce the practical impact of the weak KDF.
- Disable unused services and API endpoints exposed by the device.
# Configuration example: restrict access to the D1101V-F management interface
# Replace 10.10.20.5 with the device IP and 10.10.99.0/24 with the admin subnet
iptables -A FORWARD -s 10.10.99.0/24 -d 10.10.20.5 -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -d 10.10.20.5 -p tcp --dport 443 -j DROP
iptables -A FORWARD -d 10.10.20.5 -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
