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AUSCERT External Security Bulletin Redistribution
ESB-2019.4394.2
Cisco Webex Teams for Windows DLL Hijacking Vulnerability
3 December 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Webex Teams
Cisco Webex Meetings Client
Publisher: Cisco Systems
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-16001
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20191120-webex-teams-dll
Revision History: December 3 2019: Updated advisory to reflect that
Meetings Client is also affected
November 21 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Webex Teams and Cisco Webex Meetings Client DLL Hijacking Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20191120-webex-teams-dll
First Published: 2019 November 20 16:00 GMT
Last Updated: 2019 December 2 16:36 GMT
Version 2.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvq87642CSCvs05073
CVE-2019-16001
CWE-427
CVSS Score:
5.3 AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:X/RL:X/RC:X
Summary
o A vulnerability in the loading mechanism of specific dynamic link libraries
in Cisco Webex Teams for Windows and Cisco Webex Meetings Client for
Windows could allow an authenticated, local attacker to perform a DLL
hijacking attack. To exploit this vulnerability, the attacker would need to
have valid credentials on the Windows system.
The vulnerability is due to insufficient validation of the resources loaded
by the application at run time. An attacker could exploit this
vulnerability by crafting a malicious DLL file and placing it in a specific
location on the targeted system. The malicious DLL file would execute when
the vulnerable application is launched. A successful exploit could allow
the attacker to execute arbitrary code on the target machine with the
privileges of another user account.
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-20191120-webex-teams-dll
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected all Cisco Webex
Teams for Windows and all Cisco Webex Meetings Client for Windows releases.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 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.
Fixed Releases
For information about fixed software releases, see the Details section in
the bug ID(s) at the top of this advisory.
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 John Tear 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-20191120-webex-teams-dll
Revision History
o +---------+----------------------+------------+--------+------------------+
| Version | Description | Section | Status | Date |
+---------+----------------------+------------+--------+------------------+
| | Added Cisco Webex | | | |
| | Meetings Client to | Summary, | | |
| 2.0 | the list of affected | Vulnerable | Final | 2019-November-28 |
| | products and link to | Products | | |
| | the related software | | | |
| | defect. | | | |
+---------+----------------------+------------+--------+------------------+
| 1.0 | Initial public | - | Final | 2019-November-20 |
| | release. | | | |
+---------+----------------------+------------+--------+------------------+
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