CVE-2022-20784— Cisco Web Security Appliance Filter 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）公司的一款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 Web Security Appliance (WSA) 存在输入验证错误漏洞，该漏洞源于对插入 URL 的某些字符组合的错误处理。攻击者利用此漏洞可绕过 Web 代理并访问已被策略阻止的 Web 内容。
Possible ATT&CK Techniques 1 AI
T1560.001 · Archive via Utility
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I. Basic Information for CVE-2022-20784
Vulnerability Information
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Vulnerability Title
Cisco Web Security Appliance Filter Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Web-Based Reputation Score (WBRS) engine of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass established web request policies and access blocked content on an affected device. This vulnerability is due to incorrect handling of certain character combinations inserted into a URL. An attacker could exploit this vulnerability by sending crafted URLs to be processed by an affected device. A successful exploit could allow the attacker to bypass the web proxy and access web content that has been blocked by policy.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Web Security Appliance 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Web Security Appliance（WSA）是美国思科（Cisco）公司的一款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 Web Security Appliance (WSA) 存在输入验证错误漏洞，该漏洞源于对插入 URL 的某些字符组合的错误处理。攻击者利用此漏洞可绕过 Web 代理并访问已被策略阻止的 Web 内容。
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) | n/a | - |
|
II. Public POCs for CVE-2022-20784
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2022-20784 (1)
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-swa-filter-bypass-XXXTU3X vendor-advisory x_refsource_CISCO
Same Patch Batch · Cisco · 2022-04-06 · 12 CVEs total
| CVE-2022-20755 | 9.0 CRITICAL | Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities |
| CVE-2022-20754 | 9.0 CRITICAL | Cisco Expressway Series and Cisco TelePresence Video Communication Server Vulnerabilities |
| CVE-2022-20756 | 8.6 HIGH | Cisco Identity Services Engine RADIUS Service Denial of Service Vulnerability |
| CVE-2022-20762 | 7.8 HIGH | Cisco Ultra Cloud Core - Subscriber Microservices Infrastructure Privilege Escalation Vuln |
| CVE-2022-20774 | 6.8 MEDIUM | Cisco IP Phone 6800, 7800, and 8800 Series with Multiplatform Firmware Cross-Site Request |
| CVE-2022-20782 | 6.5 MEDIUM | Cisco Identity Services Engine Sensitive Information Disclosure Vulnerability |
| CVE-2022-20665 | 6.0 MEDIUM | Cisco StarOS Command Injection Vulnerability |
| CVE-2022-20741 | 5.4 MEDIUM | Cisco Secure Network Analytics Network Diagrams Application Cross-Site Scripting Vulnerabi |
| CVE-2022-20763 | 5.4 MEDIUM | Cisco Webex Meetings Java Deserialization Vulnerability |
| CVE-2022-20781 | 5.4 MEDIUM | Cisco Web Security Appliance Stored Cross-Site Scripting Vulnerability |
| CVE-2022-20675 | 5.3 MEDIUM | Multiple Cisco Security Products Simple Network Management Protocol Service Denial of Serv |
IV. Related Vulnerabilities
Same product: Cisco Web Security Appliance (WSA)
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CVE-2022-20781
Cisco Web Security Appliance Stored Cross-Site Scripting Vul -
CVE-2021-34698
Cisco Web Security Appliance Proxy Service Denial of Service
Same vendor: Cisco
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V. Comments for CVE-2022-20784
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