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CVE-2021-34566— WAGO I/O-Check Service prone to Memory Overflow

Quick assessment

Affected
WAGO 750-81xx/xxx-xxxFW
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.

WAGO是德国万可（WAGO）公司的一款750-88x系列可编程逻辑控制器。该设备专门为在工业环境下应用而设计的数字运算操作电子系统。 WAGO I/O-Check Service存在安全漏洞，该漏洞源于未经身份验证的远程攻击者可以发送包含操作系统命令的特制数据包，使iocheck进程崩溃并写入内存，从而导致完整性丧失和DoS。

CVSS 9.1 · Critical EPSS 1.06% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-34566

Vulnerability Information
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Vulnerability Title
WAGO I/O-Check Service prone to Memory Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
WAGO 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAGO是德国万可（WAGO）公司的一款750-88x系列可编程逻辑控制器。该设备专门为在工业环境下应用而设计的数字运算操作电子系统。 WAGO I/O-Check Service存在安全漏洞，该漏洞源于未经身份验证的远程攻击者可以发送包含操作系统命令的特制数据包，使iocheck进程崩溃并写入内存，从而导致完整性丧失和DoS。
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
WAGO 750-81xx/xxx-xxxFW FW1 ~ FW18 Patch 2 -
WAGO 750-82xx/xxx-xxx FW1 ~ FW18 Patch 2 -
WAGO 752-8303/8000-0002 FW1 ~ FW18 Patch 2 -
WAGO 762-4xxx FW1 ~ FW18 Patch 2 -
WAGO 762-5xxx FW1 ~ FW18 Patch 2 -
WAGO 762-6xxx FW1 ~ FW18 Patch 2 -

II. Public POCs for CVE-2021-34566

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III. Intelligence Information for CVE-2021-34566

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Other References for CVE-2021-34566 (1)

Same Patch Batch · WAGO · 2022-11-09 · 4 CVEs total

CVE-2021-34569 9.8 CRITICAL WAGO I/O-Check Service prone to Out-of-bounds Write
CVE-2021-34567 8.2 HIGH WAGO I/O-Check Service prone to Out-of-bounds Read
CVE-2021-34568 7.5 HIGH WAGO I/O-Check Service prone to Allocation of Resources Without Limits or Throttling

IV. Related Vulnerabilities

Same product: 750-81xx/xxx-xxxFW
Same vendor: WAGO
Same weakness: CWE-120

V. Comments for CVE-2021-34566

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