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CVE-2021-34572— Insufficient Verification of Data Authenticity in Enbra EWM (replay attack)

Quick assessment

Affected
Enbra EWM 1.7.29
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Enbra Ewm是捷克Enbra公司的一个通用读数装置。使用无线电读取水表、供暖成本指标和热量表。 Enbra EWM 1.7.29版本存在数据伪造问题漏洞，该漏洞源于软件不检查或检测由无线M-Bus安全模式5设备发送的重放攻击。相反，传感器的时间戳被读出的时间所取代，即使数据是较早数据的重放。

CVSS 6.5 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-34572

Vulnerability Information
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Vulnerability Title
Insufficient Verification of Data Authenticity in Enbra EWM (replay attack)
Source: CVE Program / CVE List V5
Vulnerability Description
Enbra EWM 1.7.29 does not check for or detect replay attacks sent by wireless M-Bus Security mode 5 devices. Instead timestamps of the sensor are replaced by the time of the readout even if the data is a replay of earlier data.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Enbra Ewm数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Enbra Ewm是捷克Enbra公司的一个通用读数装置。使用无线电读取水表、供暖成本指标和热量表。 Enbra EWM 1.7.29版本存在数据伪造问题漏洞，该漏洞源于软件不检查或检测由无线M-Bus安全模式5设备发送的重放攻击。相反，传感器的时间戳被读出的时间所取代，即使数据是较早数据的重放。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Enbra EWM 1.7.29 03.11.2019 -

II. Public POCs for CVE-2021-34572

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III. Intelligence Information for CVE-2021-34572

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Other References for CVE-2021-34572 (1)

Same Patch Batch · Enbra · 2021-09-16 · 3 CVEs total

CVE-2021-34571 6.5 MEDIUM Hard-coded Credentials in Enbra Wireless M-Bus devices
CVE-2021-34573 6.2 MEDIUM Incorrect calculation in Enbra EWM does not report backflows or no flow events

IV. Related Vulnerabilities

Same vendor: Enbra
Same weakness: CWE-345