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AUSCERT External Security Bulletin Redistribution
ESB-2021.1176
Cisco Webex Meetings HTML Injection Vulnerability
8 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Webex Meetings
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1420
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-VObwRKWV
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Cisco Webex Meetings HTML Injection Vulnerability
Priority: Medium
Advisory ID: cisco-sa-webex-VObwRKWV
First Published: 2021 April 7 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx12050
CVE Names: CVE-2021-1420
CWEs: CWE-80
Summary
o A vulnerability in certain web pages of Cisco Webex Meetings could allow an
unauthenticated, remote attacker to modify a web page in the context of a
user's browser.
The vulnerability is due to improper checks on parameter values in affected
pages. An attacker could exploit this vulnerability by persuading a user to
follow a crafted link that is designed to pass HTML code into an affected
parameter. A successful exploit could allow the attacker to alter the
contents of a web page to redirect the user to potentially malicious
websites, or the attacker could use this vulnerability to conduct further
client-side attacks.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-VObwRKWV
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Webex Meetings, which is cloud based.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has addressed this vulnerability in Cisco Webex Meetings, which is
cloud based. No user action is required. Customers can determine the
current remediation status or software version by using the Help function
in the service GUI.
Customers who need additional information are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Sem Voigtlander for reporting this vulnerability.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-VObwRKWV
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-APR-07 |
+----------+---------------------------+----------+--------+--------------+
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