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AUSCERT External Security Bulletin Redistribution
ESB-2018.1360
Multiple remote code execution vulnerabilities have been identified in
Cisco WebEx Advanced Recording Format Player
4 May 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco WebEx Advanced Recording Format Player
Publisher: Cisco Systems
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0287 CVE-2018-0264
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-webex-rce
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-war
Comment: This bulletin contains two (2) Cisco Systems security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco WebEx Advanced Recording Format Player Remote Code Execution
Vulnerability
Medium
Advisory ID:
cisco-sa-20180502-webex-rce
First Published:
2018 May 2 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvh70213
CSCvh70222
CSCvh70228
CVE-2018-0287
CWE-20
CVSS Score:
Base 6.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
CVE-2018-0287
CWE-20
Summary
o A vulnerability in the Cisco WebEx Network Recording Player for Advanced
Recording Format (ARF) files could allow an unauthenticated, remote
attacker to execute arbitrary code on an affected system.
The vulnerability is due to a design flaw in the affected software. An
attacker could exploit this vulnerability by sending a user an email
attachment or link to a malicious ARF file and persuading the user to open
the file or follow the link. A successful exploit could allow the attacker
to execute arbitrary code on the user's system.
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-20180502-webex-rce
Affected Products
o Vulnerable Products
This vulnerability affects Cisco WebEx Business Suite meeting sites, Cisco
WebEx Meetings sites, Cisco WebEx Meetings Server, and Cisco WebEx ARF
players. For information about affected software releases, consult the
Cisco bug ID(s) at the top of this advisory.
To determine whether a Cisco WebEx Meetings site is running an affected
version of a WebEx client build, users can log in to the Cisco WebEx
Meetings site and go to Support > Downloads. The version of the WebEx
client build will be displayed on the right side of the page under About
Meeting Center.
Alternatively, version information for a Cisco WebEx Meetings client can be
accessed directly within the Cisco WebEx Meetings client. Version
information for the Cisco WebEx Meetings client on Windows and Linux
platforms can be viewed by choosing Help > About Cisco WebEx Meeting Center
. Version information for the Cisco WebEx Meetings client on Mac platforms
can be viewed by choosing Meeting Center > About Cisco WebEx Meeting Center
.
Cisco WebEx software updates are cumulative in client builds. For example,
if client build 30.32.16 is fixed, build 30.32.17 will contain updated
software. Cisco WebEx site administrators have access to secondary version
nomenclature, for example, T30 SP32 EP 16, which shows that the server is
running client build 30.32.16.
Note: Customers who do not receive automatic software updates may be
running versions of Cisco WebEx that have reached end of software
maintenance and should contact customer support.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Details
o Cisco WebEx Business Suite (WBS) meeting services are a hosted multimedia
conferencing solution that is managed and maintained by Cisco WebEx. The
Cisco WebEx Meetings Server is a multimedia conferencing solution that
customers can host in their private clouds.
The ARF file format is used to store WebEx meeting recordings that have
been recorded on a WebEx meeting site.
The Cisco WebEx ARF Player is an application that is used to play back and
edit WebEx ARF recording files (files with an .arf filename extension).
The Cisco WebEx ARF Player can be installed automatically when a user
accesses a recording file that is hosted on a Cisco WebEx Meetings site
(for stream playback mode). The Cisco WebEx ARF Player can also be
installed manually after downloading the application from http://
www.webex.com/play-webex-recording.html for offline playback of recording
files.
The Cisco WebEx ARF Player is available for all Cisco WebEx Business Suite
clients (WBS31 and WBS32), Cisco WebEx Meetings clients, and Cisco WebEx
Meetings Server clients.
The vulnerability described in this advisory could allow an attacker to
cause a player application to crash or, in some cases, remotely execute
arbitrary code on an affected system.
To exploit this vulnerability, the attacker would need to persuade a user
to open a malicious ARF file by using the player application on an affected
system. The attacker may be able to accomplish an exploit by providing the
malicious ARF file directly to users, as an email attachment for example,
or by directing a user to a malicious web page. This vulnerability cannot
be triggered by users who are attending a WebEx meeting.
Workarounds
o There are no workarounds that address this vulnerability. However, it is
possible to remove all Cisco WebEx software completely from a system by
using the Meeting Services Removal Tool (for Microsoft Windows) or the Mac
WebEx Meeting Application Uninstaller (for Apple Mac OS X), both of which
are available for download from the Cisco Collaboration Help article at
https://collaborationhelp.cisco.com/article/en-us/WBX000026396.
Removal of Cisco WebEx software from a Linux or UNIX-based system can be
accomplished by following the steps in the Cisco Collaboration Help article
at https://collaborationhelp.cisco.com/article/en-us/WBX28548.
Fixed Software
o For information about fixed software releases, consult the Cisco bug ID(s)
at the top of this advisory.
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.
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 Kushal Arvind Shah of Fortinet's FortiGuard Labs
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.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-webex-rce
Revision History
+----------+-----------------------------+----------+---------+---------------+
| Version | Description | Section | Status | Date |
+----------+-----------------------------+----------+---------+---------------+
| 1.0 | Initial public release. | -- | Final | 2018-May-02 |
+----------+-----------------------------+----------+---------+---------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
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.
Subscribe to Cisco Security Notifications
o Subscribe
- -------------------------------------------------------------------------------
Cisco WebEx Advanced Recording Format Remote Code Execution Vulnerability
Critical
Advisory ID:
cisco-sa-20180502-war
First Published:
2018 May 2 16:00 GMT
Version 1.0:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvh85410
CSCvh85430
CSCvh85440
CVE-2018-0264
CWE-20
CVSS Score:
Base 9.6
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:X/RL:X/RC:X
CVE-2018-0264
CWE-20
Summary
o A vulnerability in the Cisco WebEx Network Recording Player for Advanced
Recording Format (ARF) files could allow an unauthenticated, remote
attacker to execute arbitrary code on the system of a targeted user.
An attacker could exploit this vulnerability by sending the user a link or
email attachment with a malicious ARF file and persuading the user to
follow the link or open the file. Successful exploitation could allow the
attacker to execute arbitrary code on the user's system.
The Cisco WebEx players are applications that are used to play back WebEx
meeting recordings that have been recorded by an online meeting attendee.
The player can be installed automatically when a user accesses a recording
file that is hosted on a WebEx server.
Cisco has updated affected versions of Cisco WebEx Business Suite meeting
sites, Cisco WebEx Meetings sites, Cisco WebEx Meetings Server, and the
Cisco WebEx ARF Player to 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-20180502-war
Affected Products
o Vulnerable Products
This vulnerability affects Cisco WebEx Business Suite meeting sites, Cisco
WebEx Meetings sites, Cisco WebEx Meetings Server, and Cisco WebEx ARF
players. The following client builds of Cisco WebEx Business Suite (WBS31
and WBS32), Cisco WebEx Meetings, and Cisco WebEx Meetings Server are
affected by the vulnerability described in this advisory:
- Cisco WebEx Business Suite (WBS31) client builds prior to T31.23.4
- Cisco WebEx Business Suite (WBS32) client builds prior to T32.12
- Cisco WebEx Meetings with client builds prior to T32.12
- Cisco WebEx Meeting Server builds prior to 3.0 Patch 1
To determine whether a Cisco WebEx meeting site is running an affected
version of the WebEx client build, users can log in to their Cisco WebEx
meeting site and go to Support > Downloads. The version of the WebEx client
build will be displayed on the right side of the page under About Meeting
Center. See the Fixed Software section of this advisory for details.
Alternatively, version information for the Cisco WebEx meeting client can
be accessed directly within the Cisco WebEx meeting client. Version
information for the Cisco WebEx meeting client on Windows and Linux
platforms can be viewed by choosing Help > About Cisco WebEx Meeting Center
. Version information for the Cisco WebEx meeting client on Mac platforms
can be viewed by choosing Meeting Center > About Cisco WebEx Meeting Center
.
Cisco WebEx software updates are cumulative in client builds. For example,
if client build 30.32.16 is fixed, build 30.32.17 will contain updated
software. Cisco WebEx site administrators have access to secondary version
nomenclature, for example, T30 SP32 EP 16, which shows that the server is
running client build 30.32.16.
Note: Customers who do not receive automatic software updates may be
running versions of Cisco WebEx that have reached end of software
maintenance and should contact customer support.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Details
o Cisco WebEx Business Suite (WBS) meeting services and Cisco WebEx Meetings
are a hosted multimedia conferencing solution that is managed and
maintained by Cisco WebEx. The Cisco WebEx Meetings Server is a multimedia
conferencing solution that customers can host in their private clouds.
The ARF file format is used to store WebEx meeting recordings that have
been recorded on a WebEx meeting site or on the computer of an online
meeting attendee. The Cisco WebEx ARF Player is an application that is used
to play back and edit WebEx ARF recording files (files with an .arf
filename extension).
The Cisco WebEx ARF Player can be installed automatically when a user
accesses a recording file that is hosted on a Cisco WebEx Meetings site
(for streaming playback mode). The Cisco WebEx ARF Player can also be
installed manually after downloading the application from https://
www.webex.com/play-webex-recording.html for offline playback of recording
files.
The Cisco WebEx ARF Player is available for all Cisco WebEx meeting site
clients (WBS31, WBS32, and WebEx Meetings) and for Cisco WebEx Meetings
Server clients.
Workarounds
o There are no workarounds that address this vulnerability. However, it is
possible to remove all WebEx software completely from a system by using the
Meeting Services Removal Tool (for Microsoft Windows users) or the Mac
WebEx Meeting Application Uninstaller (for Apple Mac OS X users), both of
which are available for download from the Cisco Collaboration Help article
at https://collaborationhelp.cisco.com/article/en-us/WBX000026396.
Removal of Cisco WebEx software from a Linux or UNIX-based system can be
accomplished by following the steps in the Cisco Collaboration Help article
at https://collaborationhelp.cisco.com/article/en-us/WBX28548.
Complete removal of the Cisco WebEx software will no longer allow WebEx
functionality unless the software is reinstalled prior to attending a
meeting or watching a recording.
Fixed Software
o 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.html
Additionally, 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.html
Customers 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
The following client builds of Cisco WebEx Business Suite (WBS31 and
WBS32), Cisco WebEx Meetings, and Cisco WebEx Meetings Server address the
vulnerability described in this advisory:
- Cisco WebEx Business Suite (WBS31) client builds T31.23.4 and later
- Cisco WebEx Business Suite (WBS32) client builds T32.12 and later
- Cisco WebEx Meetings with client builds T32.12 and later
- Cisco WebEx Meeting Server builds 3.0 Patch 1 and later
To determine whether a Cisco WebEx meeting site is running an affected
version of a WebEx client build, users can log in to their Cisco WebEx
meeting site and go to Support > Downloads. The version of the WebEx client
build will be displayed on the right side of the page under About Meeting
Center. Cisco WebEx software updates are cumulative in client builds. For
example, if client build 30.32.16 is fixed, build 30.32.17 will contain
updated software.
The vulnerability disclosed in this advisory affects the Cisco WebEx ARF
Player. The Microsoft Windows, Apple Mac OS X, and Linux versions of the
player are all affected by the vulnerability described in this advisory. If
the Cisco WebEx ARF Player was automatically installed, it will be
automatically upgraded to the latest, non-vulnerable version when users
access a recording file that is hosted on a WebEx meeting site. If the
Cisco WebEx ARF Player was manually installed, users will need to manually
install a new version of the player after downloading the latest version
from https://www.webex.com/play-webex-recording.html.
Users can manually verify the installed version of the Cisco WebEx ARF
Player to determine whether they are affected by this vulnerability.
Note: Users whose WebEx Business Suites are on lockdown will need to
contact WebEx Support to apply the appropriate patch to their WebEx site.
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 Kushal Arvind Shah of Fortinet's FortiGuard Labs
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.
Subscribe to Cisco Security Notifications
o Subscribe
Action Links for This Advisory
o Snort Rule 46496
Snort Rule 46497
Snort Rule 46498
Snort Rule 46499
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180502-war
Revision History
l
o
+----------+-----------------------------+----------+---------+---------------+
| Version | Description | Section | Status | Date |
+----------+-----------------------------+----------+---------+---------------+
| 1.0 | Initial public release. | -- | Final | 2018-May-02 |
+----------+-----------------------------+----------+---------+---------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
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.
Subscribe to Cisco Security Notifications
o Subscribe
- --------------------------END INCLUDED TEXT--------------------
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The University of Queensland
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===========================================================================
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