CVE Vulnerabilities

CVE-2022-20720

Improper Link Resolution Before File Access ('Link Following')

Published: Apr 15, 2022 | Modified: Mar 04, 2024
CVSS 3.x
7.2
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
9 HIGH
AV:N/AC:L/Au:S/C:C/I:C/A:C
RedHat/V2
RedHat/V3
Ubuntu

Multiple vulnerabilities in the Cisco IOx application hosting environment on multiple Cisco platforms could allow an attacker to inject arbitrary commands into the underlying host operating system, execute arbitrary code on the underlying host operating system, install applications without being authenticated, or conduct a cross-site scripting (XSS) attack against a user of the affected software. For more information about these vulnerabilities, see the Details section of this advisory.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Name Vendor Start Version End Version
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 16.6.9 (including) 16.6.9 (including)
Ios_xe Cisco 16.6.10 (including) 16.6.10 (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 16.9.7 (including) 16.9.7 (including)
Ios_xe Cisco 16.9.8 (including) 16.9.8 (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 16.12.2 (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 16.12.5 (including) 16.12.5 (including)
Ios_xe Cisco 16.12.5a (including) 16.12.5a (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 17.3.1z (including) 17.3.1z (including)
Ios_xe Cisco 17.3.2 (including) 17.3.2 (including)
Ios_xe Cisco 17.3.2a (including) 17.3.2a (including)
Ios_xe Cisco 17.3.3 (including) 17.3.3 (including)
Ios_xe Cisco 17.3.3a (including) 17.3.3a (including)
Ios_xe Cisco 17.3.4 (including) 17.3.4 (including)
Ios_xe Cisco 17.3.4a (including) 17.3.4a (including)
Ios_xe Cisco 17.3.4b (including) 17.3.4b (including)
Ios_xe Cisco 17.3.4c (including) 17.3.4c (including)
Ios_xe Cisco 17.4.1 (including) 17.4.1 (including)
Ios_xe Cisco 17.4.1a (including) 17.4.1a (including)
Ios_xe Cisco 17.4.1b (including) 17.4.1b (including)
Ios_xe Cisco 17.4.1c (including) 17.4.1c (including)
Ios_xe Cisco 17.4.2 (including) 17.4.2 (including)
Ios_xe Cisco 17.4.2a (including) 17.4.2a (including)
Ios_xe Cisco 17.5.1 (including) 17.5.1 (including)
Ios_xe Cisco 17.5.1a (including) 17.5.1a (including)
Ios_xe Cisco 17.6.1 (including) 17.6.1 (including)
Ios_xe Cisco 17.6.1a (including) 17.6.1a (including)

Potential Mitigations

  • Follow the principle of least privilege when assigning access rights to entities in a software system.
  • Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

References