Cisco WebEx Flaw Allows Unauthorized Access

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Cisco systems were exploited by a high-severity vulnerability where a remote attacker could gain entry into password-protected meetings without any authentication.

The vulnerability CVE-2020-3142_vs was found during the resolution of a Cisco TAC support case.

The flaw (CVE-2020-3142) has a CVSS score of 7.5 out of 10

“A flaw in Cisco WebEx Meetings Suite site’s and Cisco WebEx Meetings Online site could allow an unauthorised attendee to join the meeting by accessing a known meeting ID or meeting URL from the mobile device’s web browser,” said Cisco. The browser will then request to launch the device’s WebEx mobile application.

Products affected

The vulnerability affects Cisco Webex Meetings Suite sites and Cisco WebEx Meetings Online sites for versions earlier than 39.11.5 and 40.1.3.

To update the Cisco Webex Meeting Suite site or Cisco Webex Meetings Online site, a user can perform the following steps:

  • Log in to the Cisco Webex Meetings Suite site or Cisco WebEx Meeting Online site.
  • Navigate to downloads on the left side of the page.
  • Next to Version Information hover over the circled i.
  • Check the value displayed next to Page version.

Cisco fixed this vulnerability in versions 39.11.5 and later and  40.1.3 and later. Cisco Webex Meeting mobile application or the Cisco Webex Meeting desktop application users are not required to update.

“The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements of the vulnerability that is described in this advisory,” reported Cisco.

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