CyberSecBulletin
CVE-2022-20764NVD status: Modified

Cisco RoomOS Software: URL Redirection to Untrusted Site

Published Updated By the CyberSecBulletin desk

CVE-2022-20764 is a high-severity URL redirection to untrusted site vulnerability in Cisco RoomOS Software from Cisco, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. There is no confirmed exploitation so far. EPSS estimates a 1.03% chance of exploitation within 30 days, higher than 64% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Telepresence Collaboration Endpoint to 10.8.2.5 or a later version.
  2. Update Roomos to 2021-05 or a later version.
  3. Read the advisory on tools.cisco.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
CiscoCisco RoomOS SoftwareNot specified in the recordNot stated
CiscoTelepresence Collaboration Endpointbefore 10.8.2.510.8.2.5
CiscoRoomosbefore 2021-052021-05

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.16.5MediumCNA (cisco.com)
CVSS 3.18.1HighNVD
CVSS 2.05.5MediumNVD

Official description

Multiple vulnerabilities in the web engine of Cisco TelePresence Collaboration Endpoint (CE) Software and Cisco RoomOS Software could allow a remote attacker to cause a denial of service (DoS) condition, view sensitive data on an affected device, or redirect users to an attacker-controlled destination. For more information about these vulnerabilities, see the Details section of this advisory.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: URL Redirection to Untrusted Site

The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.

How developers prevent this class of flaw

  • Use an intermediate disclaimer page that provides the user with a clear warning that they are leaving the current site. Implement a long timeout before the redirect occurs, or force the user to click on the link. Be careful to avoid XSS problems (CWE-79) when generating the disclaimer page.
  • When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs. For example, ID 1 could map to /login.asp and ID 2 could map to http://www.example.com/. Features such as the ESAPI AccessReferenceMap provide this capability.
  • Ensure that no externally-supplied requests are honored by requiring that all redirect requests include a unique nonce generated by the application. Be sure that the nonce is not predictable (CWE-330).

More URL Redirection to Untrusted Site vulnerabilities (CWE-601)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in Cisco RoomOS Software

All Cisco RoomOS Software vulnerabilities

Recent URL Redirection to Untrusted Site vulnerabilities

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