Vulnerability · Published Apr 21, 2022 · Assigned by cisco

CVE-2022-20805Cisco Umbrella Secure Web Gateway File Decryption Bypass Vulnerability

Medium 4.1

In plain English

A medium-severity security flaw in Cisco Umbrella Insights Virtual Appliance from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).

Severity (CVSS 3.1)4.1Medium

Exploit odds (30 days)0.2%top 92.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco Umbrella Insights Virtual Appliance	n/a

Weakness: CWE-693 · Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

References

20220420 Cisco Umbrella Secure Web Gateway File Decryption Bypass Vulnerability vendor-advisory, x_refsource_CISCO