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CVE-2021-3031— PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)

Quick assessment

Affected
Palo Alto Networks PAN-OS
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.

Palo Alto Networks PAN-OS等都是美国Palo Alto Networks公司的产品。Palo Alto Networks PAN-OS是一套为其防火墙设备开发的操作系统。Palo Alto Networks PA-200是一款防火墙设备。Palo Alto Networks PA-220是一款防火墙设备。 多款 Palo Alto Networks 产品存在信息泄露漏洞，该漏洞源于程序创建数据帧之前不会清除以太网报文中的填充字节。这会将少量随机信息从防火墙内存泄漏到以太网数据包中。

CVSS 4.3 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-3031

Vulnerability Information
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Vulnerability Title
PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)
Source: CVE Program / CVE List V5
Vulnerability Description
Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200 Series, and PA-7000 Series firewalls are not cleared before the data frame is created. This leaks a small amount of random information from the firewall memory into the Ethernet packets. An attacker on the same Ethernet subnet as the PAN-OS firewall is able to collect potentially sensitive information from these packets. This issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001. This issue impacts: PAN-OS 8.1 version earlier than PAN-OS 8.1.18; PAN-OS 9.0 versions earlier than PAN-OS 9.0.12; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
多款 Palo Alto Networks 产品信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Palo Alto Networks PAN-OS等都是美国Palo Alto Networks公司的产品。Palo Alto Networks PAN-OS是一套为其防火墙设备开发的操作系统。Palo Alto Networks PA-200是一款防火墙设备。Palo Alto Networks PA-220是一款防火墙设备。 多款 Palo Alto Networks 产品存在信息泄露漏洞，该漏洞源于程序创建数据帧之前不会清除以太网报文中的填充字节。这会将少量随机信息从防火墙内存泄漏到以太网数据包中。
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
Palo Alto Networks PAN-OS 8.1 ~ 8.1.18 -
Palo Alto Networks PAN-OS 10.0.* -

II. Public POCs for CVE-2021-3031

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III. Intelligence Information for CVE-2021-3031

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Vendor Advisories for CVE-2021-3031 (1)

IV. Related Vulnerabilities

Same product: PAN-OS
Same vendor: Palo Alto Networks
Same weakness: CWE-200

V. Comments for CVE-2021-3031

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