// For flags

CVE-2022-20805

Cisco Umbrella Secure Web Gateway File Decryption Bypass Vulnerability

Severity Score

4.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

A vulnerability in the automatic decryption process in Cisco Umbrella Secure Web Gateway (SWG) could allow an authenticated, adjacent attacker to bypass the SSL decryption and content filtering policies on an affected system. This vulnerability is due to how the decryption function uses the TLS Sever Name Indication (SNI) extension of an HTTP request to discover the destination domain and determine if the request needs to be decrypted. An attacker could exploit this vulnerability by sending a crafted request over TLS from a client to an unknown or controlled URL. A successful exploit could allow an attacker to bypass the decryption process of Cisco Umbrella SWG and allow malicious content to be downloaded to a host on a protected network. There are workarounds that address this vulnerability.

Una vulnerabilidad en el proceso de descifrado automático en Cisco Umbrella Secure Web Gateway (SWG) podría permitir a un atacante autenticado y adyacente omitir el descifrado SSL y las políticas de filtrado de contenidos en un sistema afectado. Esta vulnerabilidad es debido a la forma en que la función de descifrado usa la extensión TLS Sever Name Indication (SNI) de una petición HTTP para detectar el dominio de destino y determinar si es necesario descifrar la petición. Un atacante podría explotar esta vulnerabilidad mediante el envío de una petición diseñada sobre TLS desde un cliente a una URL desconocida o controlada. Una explotación con éxito podría permitir a un atacante omitir el proceso de descifrado de Cisco Umbrella SWG y permitir una descarga de contenido malicioso a un host en una red protegida. Se presentan medidas de mitigación que abordan esta vulnerabilidad

*Credits: N/A
CVSS Scores
Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Attack Vector
Adjacent
Attack Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-11-02 CVE Reserved
  • 2022-04-21 CVE Published
  • 2023-11-12 EPSS Updated
  • 2024-11-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-327: Use of a Broken or Risky Cryptographic Algorithm
  • CWE-693: Protection Mechanism Failure
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Umbrella Secure Web Gateway
Search vendor "Cisco" for product "Umbrella Secure Web Gateway"
*-
Affected