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CVE-2019-1672— Cisco Web Security Appliance Decryption Policy Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco Web Security Appliance (WSA)
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.

Cisco Web Security Appliance（WSA）是美国思科（Cisco）公司的一套Web安全设备。该设备提供基于SaaS的访问控制、实时网络报告和追踪、制定安全策略等功能。 Cisco WSA 10.1.x版本和10.5.x版本中的Decryption Policy Default Action功能存在安全漏洞，该漏洞源于程序没有正确地处理由SSL所加密的流量。远程攻击者可利用该漏洞阻止进行SSL连接。

AI Predicted 9.8 Difficulty: Easy EPSS 1.65% · P76

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2019-1672

Vulnerability Information
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Vulnerability Title
Cisco Web Security Appliance Decryption Policy Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Decryption Policy Default Action functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured drop policy and allow traffic onto the network that should have been denied. The vulnerability is due to the incorrect handling of SSL-encrypted traffic when Decrypt for End-User Notification is disabled in the configuration. An attacker could exploit this vulnerability by sending a SSL connection through the affected device. A successful exploit could allow the attacker to bypass a configured drop policy to block specific SSL connections. Releases 10.1.x and 10.5.x are affected.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Web Security Appliance 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Web Security Appliance（WSA）是美国思科（Cisco）公司的一套Web安全设备。该设备提供基于SaaS的访问控制、实时网络报告和追踪、制定安全策略等功能。 Cisco WSA 10.1.x版本和10.5.x版本中的Decryption Policy Default Action功能存在安全漏洞，该漏洞源于程序没有正确地处理由SSL所加密的流量。远程攻击者可利用该漏洞阻止进行SSL连接。
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
Cisco Cisco Web Security Appliance (WSA) 10.1 -

II. Public POCs for CVE-2019-1672

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III. Intelligence Information for CVE-2019-1672

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Vendor Advisories for CVE-2019-1672 (2)

Same Patch Batch · Cisco · 2019-02-08 · 3 CVEs total

CVE-2019-1673 Cisco Identity Services Engine Cross-Site Scripting Vulnerability
CVE-2019-1676 Cisco Meeting Server SIP Processing Denial of Service Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Web Security Appliance (WSA)
Same vendor: Cisco
Same weakness: CWE-400

V. Comments for CVE-2019-1672

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