Cisco Security Advisory
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CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
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A vulnerability in the Cisco Webex Teams client, formerly Cisco Spark, could allow an attacker to execute arbitrary commands on a targeted system.
This vulnerability is due to unsafe search paths used by the application URI that is defined in Windows operating systems. An attacker could exploit this vulnerability by convincing a targeted user to follow a malicious link. Successful exploitation could cause the application to load libraries from the directory targeted by the URI link. The attacker could use this behavior to execute arbitrary commands on the system with the privileges of the targeted user if the attacker can place a crafted library in a directory that is accessible to the vulnerable system.
Cisco has released software updates that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190123-webex-teams
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Vulnerable Products
This vulnerability affects all versions of Cisco Webex Teams prior to version 3.0.10260, which was released on November 21, 2018.
To determine which Cisco Webex Teams version is running, users can click their profile picture, which is between the Home icon and search field in the application window. The user can choose Help > About to view the version information, which is similar to the following:
Webex Teams
Version: 3.0.10260.0Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
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There are no workarounds that address this vulnerability.
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Cisco has released free software updates that address the vulnerability described in this advisory. Customers may only install and expect support for software versions and feature sets for which they have purchased a license. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.htmlAdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner. In most cases this will be a maintenance upgrade to software that was previously purchased. Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC:
https://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.htmlCustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade.
Fixed Releases
Cisco Webex Teams versions 3.0.10260 (released on November 21, 2018) and later contain the fix for this vulnerability.
Customers are advised to upgrade to the latest version of Cisco Webex Teams. In the left panel of the app, click the Refresh icon (the circular green arrow) and then click Update. If the Refresh icon is not present, there is no update pending.
For more information, see the Cisco Webex Teams help article Update the Cisco Webex Teams App to the Latest Release.
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The Cisco Product Security Incident Response Team (PSIRT) is aware of a public announcement that demonstrates exploit methods related to this vulnerability. However, there have been no reports of malicious use of the vulnerability that is described in this advisory.
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Cisco would like to thank rgod of 9sg Security Team, working with Trend Micro's Zero Day Initiative, for reporting the vulnerability.
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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.
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Show LessVersion Description Section Status Date 1.1 Updated information about public announcements. Exploitation and Public Announcements Final 2019-April-03 1.0 Initial public release. — Final 2019-January-23
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