Vulnerabilities
Misconfiguration
Runtime Security
Compliance
CVE Vulnerabilities

CVE-2021-1403

Improper Restriction of Rendered UI Layers or Frames

Published: Mar 24, 2021 | Modified: Nov 07, 2023
CVSS 3.x
7.4
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
CVSS 2.x
7.1 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C
RedHat/V2
RedHat/V3
Ubuntu
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-1403
CWEhttps://cwe.mitre.org/data/definitions/1021.html

A vulnerability in the web UI feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a cross-site WebSocket hijacking (CSWSH) attack and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient HTTP protections in the web UI on an affected device. An attacker could exploit this vulnerability by persuading an authenticated user of the web UI to follow a crafted link. A successful exploit could allow the attacker to corrupt memory on the affected device, forcing it to reload and causing a DoS condition.

Weakness

The web application does not restrict or incorrectly restricts frame objects or UI layers that belong to another application or domain, which can lead to user confusion about which interface the user is interacting with.

Affected Software

Name Vendor Start Version End Version
Ios_xe Cisco 3.15.1xbs (including) 3.15.1xbs (including)
Ios_xe Cisco 3.15.2xbs (including) 3.15.2xbs (including)
Ios_xe Cisco 16.3.1 (including) 16.3.1 (including)
Ios_xe Cisco 16.3.1a (including) 16.3.1a (including)
Ios_xe Cisco 16.3.2 (including) 16.3.2 (including)
Ios_xe Cisco 16.3.3 (including) 16.3.3 (including)
Ios_xe Cisco 16.3.4 (including) 16.3.4 (including)
Ios_xe Cisco 16.3.5 (including) 16.3.5 (including)
Ios_xe Cisco 16.3.5b (including) 16.3.5b (including)
Ios_xe Cisco 16.3.6 (including) 16.3.6 (including)
Ios_xe Cisco 16.3.7 (including) 16.3.7 (including)
Ios_xe Cisco 16.3.8 (including) 16.3.8 (including)
Ios_xe Cisco 16.3.9 (including) 16.3.9 (including)
Ios_xe Cisco 16.3.10 (including) 16.3.10 (including)
Ios_xe Cisco 16.3.11 (including) 16.3.11 (including)
Ios_xe Cisco 16.4.1 (including) 16.4.1 (including)
Ios_xe Cisco 16.4.2 (including) 16.4.2 (including)
Ios_xe Cisco 16.4.3 (including) 16.4.3 (including)
Ios_xe Cisco 16.5.1 (including) 16.5.1 (including)
Ios_xe Cisco 16.5.1a (including) 16.5.1a (including)
Ios_xe Cisco 16.5.1b (including) 16.5.1b (including)
Ios_xe Cisco 16.5.2 (including) 16.5.2 (including)
Ios_xe Cisco 16.5.3 (including) 16.5.3 (including)
Ios_xe Cisco 16.6.1 (including) 16.6.1 (including)
Ios_xe Cisco 16.6.2 (including) 16.6.2 (including)
Ios_xe Cisco 16.6.3 (including) 16.6.3 (including)
Ios_xe Cisco 16.6.4 (including) 16.6.4 (including)
Ios_xe Cisco 16.6.4a (including) 16.6.4a (including)
Ios_xe Cisco 16.6.4s (including) 16.6.4s (including)
Ios_xe Cisco 16.6.5 (including) 16.6.5 (including)
Ios_xe Cisco 16.6.5a (including) 16.6.5a (including)
Ios_xe Cisco 16.6.5b (including) 16.6.5b (including)
Ios_xe Cisco 16.6.6 (including) 16.6.6 (including)
Ios_xe Cisco 16.6.7 (including) 16.6.7 (including)
Ios_xe Cisco 16.6.7a (including) 16.6.7a (including)
Ios_xe Cisco 16.6.8 (including) 16.6.8 (including)
Ios_xe Cisco 16.7.1 (including) 16.7.1 (including)
Ios_xe Cisco 16.7.1a (including) 16.7.1a (including)
Ios_xe Cisco 16.7.1b (including) 16.7.1b (including)
Ios_xe Cisco 16.7.2 (including) 16.7.2 (including)
Ios_xe Cisco 16.7.3 (including) 16.7.3 (including)
Ios_xe Cisco 16.7.4 (including) 16.7.4 (including)
Ios_xe Cisco 16.8.1 (including) 16.8.1 (including)
Ios_xe Cisco 16.8.1a (including) 16.8.1a (including)
Ios_xe Cisco 16.8.1b (including) 16.8.1b (including)
Ios_xe Cisco 16.8.1c (including) 16.8.1c (including)
Ios_xe Cisco 16.8.1d (including) 16.8.1d (including)
Ios_xe Cisco 16.8.1e (including) 16.8.1e (including)
Ios_xe Cisco 16.8.1s (including) 16.8.1s (including)
Ios_xe Cisco 16.8.2 (including) 16.8.2 (including)
Ios_xe Cisco 16.8.3 (including) 16.8.3 (including)
Ios_xe Cisco 16.9.1 (including) 16.9.1 (including)
Ios_xe Cisco 16.9.1a (including) 16.9.1a (including)
Ios_xe Cisco 16.9.1b (including) 16.9.1b (including)
Ios_xe Cisco 16.9.1c (including) 16.9.1c (including)
Ios_xe Cisco 16.9.1d (including) 16.9.1d (including)
Ios_xe Cisco 16.9.1s (including) 16.9.1s (including)
Ios_xe Cisco 16.9.2 (including) 16.9.2 (including)
Ios_xe Cisco 16.9.2a (including) 16.9.2a (including)
Ios_xe Cisco 16.9.2s (including) 16.9.2s (including)
Ios_xe Cisco 16.9.3 (including) 16.9.3 (including)
Ios_xe Cisco 16.9.3a (including) 16.9.3a (including)
Ios_xe Cisco 16.9.3h (including) 16.9.3h (including)
Ios_xe Cisco 16.9.3s (including) 16.9.3s (including)
Ios_xe Cisco 16.9.4 (including) 16.9.4 (including)
Ios_xe Cisco 16.9.4c (including) 16.9.4c (including)
Ios_xe Cisco 16.9.5 (including) 16.9.5 (including)
Ios_xe Cisco 16.9.5f (including) 16.9.5f (including)
Ios_xe Cisco 16.9.6 (including) 16.9.6 (including)
Ios_xe Cisco 16.10.1 (including) 16.10.1 (including)
Ios_xe Cisco 16.10.1a (including) 16.10.1a (including)
Ios_xe Cisco 16.10.1b (including) 16.10.1b (including)
Ios_xe Cisco 16.10.1c (including) 16.10.1c (including)
Ios_xe Cisco 16.10.1d (including) 16.10.1d (including)
Ios_xe Cisco 16.10.1e (including) 16.10.1e (including)
Ios_xe Cisco 16.10.1f (including) 16.10.1f (including)
Ios_xe Cisco 16.10.1g (including) 16.10.1g (including)
Ios_xe Cisco 16.10.1s (including) 16.10.1s (including)
Ios_xe Cisco 16.10.2 (including) 16.10.2 (including)
Ios_xe Cisco 16.10.3 (including) 16.10.3 (including)
Ios_xe Cisco 16.11.1 (including) 16.11.1 (including)
Ios_xe Cisco 16.11.1a (including) 16.11.1a (including)
Ios_xe Cisco 16.11.1b (including) 16.11.1b (including)
Ios_xe Cisco 16.11.1c (including) 16.11.1c (including)
Ios_xe Cisco 16.11.1s (including) 16.11.1s (including)
Ios_xe Cisco 16.11.2 (including) 16.11.2 (including)
Ios_xe Cisco 16.12.1 (including) 16.12.1 (including)
Ios_xe Cisco 16.12.1a (including) 16.12.1a (including)
Ios_xe Cisco 16.12.1c (including) 16.12.1c (including)
Ios_xe Cisco 16.12.1s (including) 16.12.1s (including)
Ios_xe Cisco 16.12.1t (including) 16.12.1t (including)
Ios_xe Cisco 16.12.1w (including) 16.12.1w (including)
Ios_xe Cisco 16.12.1x (including) 16.12.1x (including)
Ios_xe Cisco 16.12.1y (including) 16.12.1y (including)
Ios_xe Cisco 16.12.1z (including) 16.12.1z (including)
Ios_xe Cisco 16.12.1za (including) 16.12.1za (including)
Ios_xe Cisco 16.12.2 (including) 16.12.2 (including)
Ios_xe Cisco 16.12.2a (including) 16.12.2a (including)
Ios_xe Cisco 16.12.2s (including) 16.12.2s (including)
Ios_xe Cisco 16.12.2t (including) 16.12.2t (including)
Ios_xe Cisco 16.12.3 (including) 16.12.3 (including)
Ios_xe Cisco 16.12.3a (including) 16.12.3a (including)
Ios_xe Cisco 16.12.3s (including) 16.12.3s (including)
Ios_xe Cisco 16.12.4 (including) 16.12.4 (including)
Ios_xe Cisco 16.12.4a (including) 16.12.4a (including)
Ios_xe Cisco 17.1.1 (including) 17.1.1 (including)
Ios_xe Cisco 17.1.1a (including) 17.1.1a (including)
Ios_xe Cisco 17.1.1s (including) 17.1.1s (including)
Ios_xe Cisco 17.1.1t (including) 17.1.1t (including)
Ios_xe Cisco 17.1.2 (including) 17.1.2 (including)
Ios_xe Cisco 17.1.3 (including) 17.1.3 (including)
Ios_xe Cisco 17.2.1 (including) 17.2.1 (including)
Ios_xe Cisco 17.2.1a (including) 17.2.1a (including)
Ios_xe Cisco 17.2.1r (including) 17.2.1r (including)
Ios_xe Cisco 17.2.1v (including) 17.2.1v (including)
Ios_xe Cisco 17.2.2 (including) 17.2.2 (including)
Ios_xe Cisco 17.2.3 (including) 17.2.3 (including)
Ios_xe Cisco 17.3.1 (including) 17.3.1 (including)
Ios_xe Cisco 17.3.1a (including) 17.3.1a (including)
Ios_xe Cisco 17.3.1w (including) 17.3.1w (including)
Ios_xe Cisco 17.3.1x (including) 17.3.1x (including)
Ios_xe Cisco 17.3.2 (including) 17.3.2 (including)
Ios_xe Cisco 17.3.2a (including) 17.3.2a (including)

Potential Mitigations

  • The use of X-Frame-Options allows developers of web content to restrict the usage of their application within the form of overlays, frames, or iFrames. The developer can indicate from which domains can frame the content.
  • The concept of X-Frame-Options is well documented, but implementation of this protection mechanism is in development to cover gaps. There is a need for allowing frames from multiple domains.
  • A developer can use a “frame-breaker” script in each page that should not be framed. This is very helpful for legacy browsers that do not support X-Frame-Options security feature previously mentioned.
  • It is also important to note that this tactic has been circumvented or bypassed. Improper usage of frames can persist in the web application through nested frames. The “frame-breaking” script does not intuitively account for multiple nested frames that can be presented to the user.

References

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