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CVE-2020-12494— Beckhoff: Etherleak in TwinCAT RT network driver

Quick assessment

Affected
Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys)
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.

Beckhoff TwinCAT RT是德国Beckhoff公司的一款TwinCAT以太网卡驱动程序。 Beckhoff TwinCAT RT（Intel 8254x和8255x）中存在信息泄露漏洞。该漏洞源于网络系统或产品在运行过程中存在配置等错误。未授权的攻击者可利用漏洞获取受影响组件敏感信息。

CVSS 5.3 · Medium EPSS 1.01% · P62
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I. Basic Information for CVE-2020-12494

Vulnerability Information
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Vulnerability Title
Beckhoff: Etherleak in TwinCAT RT network driver
Source: CVE Program / CVE List V5
Vulnerability Description
Beckhoff's TwinCAT RT network driver for Intel 8254x and 8255x is providing EtherCAT functionality. The driver implements real-time features. Except for Ethernet frames sent from real-time functionality, all other Ethernet frames sent through the driver are not padded if their payload is less than the minimum Ethernet frame size. Instead, arbitrary memory content is transmitted within in the padding bytes of the frame. Most likely this memory contains slices from previously transmitted or received frames. By this method, memory content is disclosed, however, an attacker can hardly control which memory content is affected. For example, the disclosure can be provoked with small sized ICMP echo requests sent to the device.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
Beckhoff TwinCAT RT 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Beckhoff TwinCAT RT是德国Beckhoff公司的一款TwinCAT以太网卡驱动程序。 Beckhoff TwinCAT RT（Intel 8254x和8255x）中存在信息泄露漏洞。该漏洞源于网络系统或产品在运行过程中存在配置等错误。未授权的攻击者可利用漏洞获取受影响组件敏感信息。
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
Beckhoff TwinCat Driver for Intel 8254x (Tcl8254x.sys) unspecified ~ 3.1.0.3603 for TwinCAT 3.1 4024 -
Beckhoff TwinCat Driver for Intel 8255x (Tcl8255x.sys) unspecified ~ 3.1.0.3600 for TwinCAT 3.1 4024 -

II. Public POCs for CVE-2020-12494

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III. Intelligence Information for CVE-2020-12494

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Other References for CVE-2020-12494 (1)

IV. Related Vulnerabilities

Same vendor: Beckhoff
Same weakness: CWE-459

V. Comments for CVE-2020-12494

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