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AUSCERT External Security Bulletin Redistribution
Cisco Data Center Network Manager Arbitrary File Upload and
Remote Code Execution Vulnerability
20 September 2019
AusCERT Security Bulletin Summary
Product: Cisco Data Center Network Manager
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Create Arbitrary Files -- Remote/Unauthenticated
CVE Names: CVE-2019-1620
Revision History: September 20 2019: Cisco notes that a proof-of-concept
exploit is now available.
June 27 2019: Initial Release
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Cisco Data Center Network Manager Arbitrary File Upload and Remote Code
Advisory ID: cisco-sa-20190626-dcnm-codex
First Published: 2019 June 26 16:00 GMT
Last Updated: 2019 September 19 16:08 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvo64647
o A vulnerability in the web-based management interface of Cisco Data Center
Network Manager (DCNM) could allow an unauthenticated, remote attacker to
upload arbitrary files on an affected device.
The vulnerability is due to incorrect permission settings in affected DCNM
software. An attacker could exploit this vulnerability by uploading
specially crafted data to the affected device. A successful exploit could
allow the attacker to write arbitrary files on the filesystem and execute
code with root privileges on the affected device.
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:
o Vulnerable Products
The vulnerability affects Cisco Data Center Network Manager (DCNM) software
releases prior to Release 11.2(1).
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o An attacker may achieve creation of arbitrary files on the underlying DCNM
filesystem by sending specially crafted data to a specific web servlet that
is available on affected devices.
In DCNM Software Release 11.0(1) and earlier, an attacker would need to be
authenticated to the DCNM web-based management interface to exploit this
In DCNM Software Release 11.1(1), unauthenticated access to the affected
web servlet is available, making it possible for an unauthenticated
attacker to exploit this vulnerability.
Cisco removed the affected web servlet completely in DCNM Software Release
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
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:
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
This vulnerability is fixed in Cisco DCNM Software Release 11.2(1) and
The software is available for download from the Software Center on
Cisco.com by doing the following:
1. Click Browse All .
2. Choose Cloud and Systems Management > Data Center Infrastructure
Management > Data Center Network Manager .
3. Access releases by using the left pane of the Data Center Network
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is aware that
proof-of-concept exploit code is available for the vulnerability described
in this advisory.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that
is described in this advisory.
o Cisco would like to thank the independent security researcher Pedro Ribeiro
for reporting this vulnerability to iDefense's Vulnerability Contributor
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.
Action Links for This Advisory
o Snort Rule 50513
Cisco Data Center Network Manager Arbitrary WAR File Upload
| Version | Description | Section | Status | Date |
| | Documented the | | | |
| | availability of | Exploitation | | |
| 1.1 | a | and Public | Final | 2019-September-19 |
| | proof-of-concept | Announcements | | |
| | exploit. | | | |
| 1.0 | Initial public | - | Final | 2019-June-26 |
| | release. | | | |
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