Multiple Vulnerabilities in Cisco Webex Could Allow for Arbitrary Code Execution

by CIRT Team

15 Jun 2021

in Security Advisories & Alerts

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DESCRIPTION:
Multiple vulnerabilities have been discovered in Cisco Webex Network
Recording Player and Cisco Webex Player that could allow for arbitrary
code execution. The Webex meeting service is a hosted multimedia
conferencing solution that is managed and maintained by Cisco Webex. The
Webex Network Recording Player is an application that is used to convert
Webex recording files to standard formats such as Windows Media Video,
Flash or MP4. The Webex Player is an application that is used to play
back and edit recorded Webex meeting files. Successful exploitation of
the most severe of these vulnerabilities could allow an unauthenticated,
remote attacker to execute code on the affected systems with the
privileges of the targeted user. Depending on the privileges associated
with the targeted user, an attacker could then install programs; view,
change, or delete data; or create new accounts with full user rights.
Users configured to have fewer privileges on the system could be less
impacted than those who operate with elevated privileges.

IMPACT:
Multiple vulnerabilities have been discovered in Cisco Webex Network
Recording Player and Cisco Webex Player that could allow for arbitrary
code execution with the privileges of the targeted user. Details of the
vulnerabilities are as follows:
* Multiple vulnerabilities exist due to an insufficient validation of
values within Webex recording files formatted as either Advanced
Recording Format (ARF) or Webex Recording Format (WRF). An attacker
could exploit the vulnerability by sending a user a malicious ARF or WRF
file through a link or email attachment and persuading the user to open
the file. A successful exploit could allow the attacker to execute
arbitrary code on the affected system with the privileges of the
targeted user. (CVE-2021-1502, CVE-2021-1503)
Successful exploitation of these vulnerabilities could allow for
arbitrary code execution in the context of the targeted user. Depending
on the privileges associated with the user, an attacker could then
install programs; view, change, or delete data; or create new accounts
with full user rights. Users whose accounts are configured to have fewer
user rights on the system could be less impacted than those who operate
with administrative user rights.

SYSTEM AFFECTED:
* Cisco Webex Player versions prior to 41.2 on Windows and MacOS
(CVE-2021-1503)
* Cisco Webex Network Recording Player versions prior to 41.2 on Windows
and MacOS (CVE-2021-1503)
* Cisco Webex Player versions prior to 41.4 on Windows and MacOS
(CVE-2021-1502)
* Cisco Webex Network Recording Player versions prior to 41.4 on Windows
and MacOS (CVE-2021-1502)

RECOMMENDATIONS:
We recommend the following actions be taken:
* Install the update provided by Cisco immediately after appropriate
testing.
* Run all software as a non-privileged user (one without administrative
privileges) to diminish the effects of a successful attack.
* Remind users not to visit websites or follow links provided by unknown
or untrusted sources.
* Inform and educate users regarding the threats posed by hypertext
links contained in emails or attachments especially from un-trusted sources.
* Apply the Principle of Least Privilege to all systems and services.

REFERENCES:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-dOJ2jOJ
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-player-rCFDeVj2
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1502
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1503