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AUSCERT External Security Bulletin Redistribution
30 November 2017
AusCERT Security Bulletin Summary
Product: Cisco UCS Central
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Unauthorised Access -- Remote with User Interaction
CVE Names: CVE-2017-12349 CVE-2017-12348
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2017 November 29 16:00 GMT
No workarounds available
Cisco Bug IDs:
Multiple vulnerabilities in the web-based management interface of
Cisco UCS Central Software could allow a remote attacker to conduct a
cross-site scripting (XSS) attack against a user of the affected
interface or hijack a valid session ID from a user of the affected
For more information about these vulnerabilities, see the Details
section of this security advisory.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
These vulnerabilities affect all releases of Cisco UCS Central
Software prior to the first fixed release. For information about
affected software releases, consult the Cisco bug IDs at the top of
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these
Two vulnerabilities in the web-based management interface of Cisco UCS
Central Software could allow a remote attacker to conduct a cross-site
scripting (XSS) attack against a user of the affected interface or
hijack a valid session ID from a user of the affected interface.
The vulnerabilities are not dependent on one another; exploitation of
one of the vulnerabilities is not required to exploit the other
vulnerability. In addition, a software release that is affected by one
of the vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows.
Cisco UCS Central Software Cross-Site Scripting Vulnerability
A vulnerability in the web-based management interface of Cisco UCS
Central Software could allow an authenticated, remote attacker to
conduct an XSS attack against a user of the web-based management
interface of the affected software.
The vulnerability is due to insufficient validation of user-supplied
input by the web-based management interface of the affected software.
An attacker could exploit this vulnerability by persuading a user of
the affected interface to click a malicious link. A successful exploit
could allow the attacker to execute arbitrary script code in the
context of the interface or allow the attacker to access sensitive
browser-based information on the users system.
To exploit this vulnerability, the attacker must have valid user
credentials for and authenticate to the affected software.
This vulnerability cannot be exploited to run persistent scripts in
the web-based management interface of the affected software and,
therefore, cannot be leveraged to affect users other than the targeted
The CVE ID for this vulnerability is: CVE-2017-12348
The Security Impact Rating (SIR) for this vulnerability is: Medium
Cisco UCS Central Software Session Fixation Vulnerability
A vulnerability in the session management functionality of the web-
based management interface of Cisco UCS Central Software could allow
an unauthenticated, remote attacker to hijack a valid session ID from
a user of the web-based management interface of the affected software.
The vulnerability exists because the affected software does not assign
a new session ID to a user session when a user authenticates to the
software. An attacker could exploit this vulnerability by using a
hijacked session ID to connect to the affected software through the
web-based management interface of the software. A successful exploit
could allow the attacker to hijack an authenticated users browser
The CVE ID for this vulnerability is: CVE-2017-12349
The SIR for this vulnerability is: Medium
There are no workarounds that address these vulnerabilities.
For information about fixed software releases, consult the Cisco bug
IDs 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
The Cisco Product Security Incident Response Team (PSIRT) is not aware
of any public announcements or malicious use of the vulnerabilities
that are described in this advisory.
Cisco would like to thank Application Security Consultant
Indrajith.A.N for reporting these vulnerabilities.
Cisco Security Vulnerability Policy
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
Understanding Cross-Site Scripting (XSS) Threat Vectors
Related to This Advisory
Version Description Section Status Date
1.0 Initial public release. Final 2017-November-29
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.
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