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CVE-2020-2040— PAN-OS: Buffer overflow when Captive Portal or Multi-Factor Authentication (MFA) is enabled

Quick assessment

Affected
Palo Alto Networks PAN-OS
Exploitation
High exploitation probability; assess promptly
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 存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。以下是受影响的产品及版本：PAN-OS 8.0 、 PAN-OS 8.1版本到PAN-OS 8.1.15版本、PAN-OS 9.0版本到PAN-OS 9.0.9版本、PAN-OS 9.1版本到PAN-OS 9.1.3版本。

CVSS 9.8 · Critical EPSS 3.94% · P90
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I. Basic Information for CVE-2020-2040

Vulnerability Information
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Vulnerability Title
PAN-OS: Buffer overflow when Captive Portal or Multi-Factor Authentication (MFA) is enabled
Source: CVE Program / CVE List V5
Vulnerability Description
A buffer overflow vulnerability in PAN-OS allows an unauthenticated attacker to disrupt system processes and potentially execute arbitrary code with root privileges by sending a malicious request to the Captive Portal or Multi-Factor Authentication interface. This issue impacts: All versions of PAN-OS 8.0; PAN-OS 8.1 versions earlier than PAN-OS 8.1.15; PAN-OS 9.0 versions earlier than PAN-OS 9.0.9; PAN-OS 9.1 versions earlier than PAN-OS 9.1.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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
Palo Alto Networks PAN-OS 存在缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Palo Alto Networks PAN-OS 存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。以下是受影响的产品及版本：PAN-OS 8.0 、 PAN-OS 8.1版本到PAN-OS 8.1.15版本、PAN-OS 9.0版本到PAN-OS 9.0.9版本、PAN-OS 9.1版本到PAN-OS 9.1.3版本。
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 8.0.* -

II. Public POCs for CVE-2020-2040

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III. Intelligence Information for CVE-2020-2040

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Vendor Advisories for CVE-2020-2040 (1)

Same Patch Batch · Palo Alto Networks · 2020-09-09 · 9 CVEs total

CVE-2020-2036 8.8 HIGH PAN-OS: Reflected Cross-Site Scripting (XSS) vulnerability in management web interface
CVE-2020-2041 7.5 HIGH PAN-OS: Management web interface denial-of-service (DoS)
CVE-2020-2037 7.2 HIGH PAN-OS: OS command injection vulnerability in the management web interface
CVE-2020-2038 7.2 HIGH PAN-OS: OS command injection vulnerability in the management web interface
CVE-2020-2042 7.2 HIGH PAN-OS: Buffer overflow in the management web interface
CVE-2020-2039 5.3 MEDIUM PAN-OS: Management web interface denial-of-service (DoS) through unauthenticated file uplo
CVE-2020-2043 3.3 LOW PAN-OS: Passwords may be logged in clear text when using after-change-detail custom syslog
CVE-2020-2044 3.3 LOW PAN-OS: Passwords may be logged in clear text while storing operational command (op comman

IV. Related Vulnerabilities

Same product: PAN-OS
Same vendor: Palo Alto Networks
Same weakness: CWE-120

V. Comments for CVE-2020-2040

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