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AUSCERT External Security Bulletin Redistribution
ESB-2019.2682
Cisco Vision Dynamic Signage Director REST API
Authentication Bypass Vulnerability
18 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Vision Dynamic Signage Director
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1917
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190717-cvdsd-wmauth
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Cisco Vision Dynamic Signage Director REST API Authentication Bypass
Vulnerability
Priority: Critical
Advisory ID: cisco-sa-20190717-cvdsd-wmauth
First Published: 2019 July 17 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvo52767
CVE-2019-1917
CWE-287
CVSS Score:
9.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the REST API interface of Cisco Vision Dynamic Signage
Director could allow an unauthenticated, remote attacker to bypass
authentication on an affected system.
The vulnerability is due to insufficient validation of HTTP requests. An
attacker could exploit this vulnerability by sending a crafted HTTP request
to an affected system. A successful exploit could allow the attacker to
execute arbitrary actions through the REST API with administrative
privileges on the affected system.
The REST API is enabled by default and cannot be disabled.
Cisco has released software updates that 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-20190717-cvdsd-wmauth
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Vision Dynamic Signage Director that is
running a vulnerable software release.
For information about which Cisco Vision Dynamic Signage Director Software
releases are vulnerable, see the Fixed Software section of this advisory.
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 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
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table:
Cisco Vision Dynamic Signage Director First Fixed Release for This
Software Release Vulnerability
Prior to 5.0 Migrate to 5.0sp9
5.0 5.0sp9
6.0 Migrate to 6.1sp3
6.1 6.1sp3
6.2 Not vulnerable
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 This vulnerability was found during internal security testing.
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-20190717-cvdsd-wmauth
Revision History
o +---------+---------------------------+---------+--------+---------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+---------+--------+---------------+
| 1.0 | Initial public release. | - | Final | 2019-July-17 |
+---------+---------------------------+---------+--------+---------------+
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