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AUSCERT External Security Bulletin Redistribution
Cisco Unified Communications Manager Path Traversal Vulnerability
16 April 2020
AusCERT Security Bulletin Summary
Product: Cisco Unified Communications Manager
Cisco Unified Communications Manager Session Management Edition
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2020-3177
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Cisco Unified Communications Manager Path Traversal Vulnerability
Advisory ID: cisco-sa-cucm-taps-path-trav-pfsFO93r
First Published: 2020 April 15 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvq58268CSCvt33058
o A vulnerability in the Tool for Auto-Registered Phones Support (TAPS) of
Cisco Unified Communications Manager (UCM) and Cisco Unified Communications
Manager Session Management Edition (SME) could allow an unauthenticated,
remote attacker to conduct directory traversal attacks on an affected
The vulnerability is due to insufficient validation of user-supplied input
to the TAPS interface of the affected device. An attacker could exploit
this vulnerability by sending a crafted request to the TAPS interface. A
successful exploit could allow the attacker to read arbitrary files in the
Cisco has released software updates that address the vulnerability
described in this advisory. There are no workarounds that address this
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable software release and the auto-registration feature is enabled.
The auto-registration feature is not enabled by default.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine Whether Auto-Registration Is Enabled
Administrators can use the following steps to determine whether
auto-registration is enabled:
1. In Cisco Unified Communications Manager Serviceability, choose Tools >
Control Center - Feature Services. The Control Center-Feature Services
2. Choose the Cisco Unified Communications Manager server from the Servers
drop-down list box. TAPS Service displays in the list in the Database
and Admin Services column, in Unified CMServices.
3. Note the status. If TAPS is already activated, Status is shown as
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o There are no workarounds that address this vulnerability.
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/
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
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
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
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table:
Cisco UCM and SME Major Release First Fixed Release for This Vulnerability
Prior to 10.5 Migrate to 10.5(2)SU9
11.0 Migrate to 11.5(1)SU7
12.0 Migrate to 12.5(1)SU2
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.
o Cisco would like to thank Brenden Meeder and Lawrence Lauderdale of Booz
Allen Hamilton 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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2020-APR-15 |
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