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AUSCERT External Security Bulletin Redistribution
ESB-2020.0038.2
Cisco Data Center Network Manager XML External Entity Read
Access Vulnerability
16 January 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Data Center Network Manager (DCNM)
Publisher: Cisco Systems
Operating System: Windows
Linux variants
Virtualisation
Impact/Access: Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-15983
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200102-dcnm-xml-ext-entity
Revision History: January 16 2020: Vendor advises that a proof-of-concept
exploit is available.
January 3 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Data Center Network Manager XML External Entity Read Access Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20200102-dcnm-xml-ext-entity
First Published: 2020 January 2 16:00 GMT
Last Updated: 2020 January 15 15:58 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvr79188 CSCvr88730 CSCvr88737
CVE-2019-15983
CWE-611
CVSS Score:
4.9 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X
Summary
o
A vulnerability in the SOAP API of Cisco Data Center Network Manager (DCNM)
could allow an authenticated, remote attacker to gain read access to
information that is stored on an affected system. To exploit this
vulnerability, an attacker would need administrative privileges on the DCNM
application.
The vulnerability exists because the SOAP API improperly handles XML
External Entity (XXE) entries when parsing certain XML files. An attacker
could exploit this vulnerability by inserting malicious XML content in an
API request. A successful exploit could allow the attacker to read
arbitrary files from the affected device.
Note: The severity of this vulnerability is aggravated by the
vulnerabilities described in the Cisco Data Center Network Manager
Authentication Bypass Vulnerabilities advisory, published simultaneously
with this one.
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-20200102-dcnm-xml-ext-entity
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco DCNM software
releases earlier than Release 11.3(1) for Microsoft Windows, Linux, and
virtual appliance platforms.
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
At the time of publication, Cisco DCNM Software releases 11.3(1) and later
contained the fix for this vulnerability.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
To download the software from the Software Center on Cisco.com, do the
following:
1. Click Browse All .
2. Choose Cloud and Systems Management > Data Center Infrastructure
Management > Data Center Network Manager .
3. Choose a release from the left pane of the Data Center Network Manager
page.
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 that is
described in this advisory.
Cisco PSIRT is not aware of any malicious use of the vulnerability that is
described in this advisory.
Source
o Cisco would like to thank Steven Seeley (mr_me) of Source Incite, working
with Trend Micro's Zero Day Initiative and iDefense, Accenture, 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.
Action Links for This Advisory
o Snort Rule 52525
Snort Rule 52526
Snort Rule 52527
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20200102-dcnm-xml-ext-entity
Revision History
o +---------+--------------------+---------------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------+---------------+--------+-----------------+
| | Updated | Exploitation | | |
| 1.1 | information about | and Public | Final | 2020-January-15 |
| | the availability | Announcements | | |
| | of exploit code. | | | |
+---------+--------------------+---------------+--------+-----------------+
| 1.0 | Initial public | - | Final | 2020-January-02 |
| | release. | | | |
+---------+--------------------+---------------+--------+-----------------+
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