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AUSCERT External Security Bulletin Redistribution
ESB-2015.1833
Cisco Unified Computing System C-Series Servers
Man-in-the-Middle Vulnerability
10 July 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Unified Computing System
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2015-4259
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=39803
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Vulnerability Alert
Cisco Unified Computing System C-Series Servers Man-in-the-Middle
Vulnerability
Threat Type: CWE-310: Cryptographic Issues
IntelliShield ID: 39803
Version: 1
First Published: 2015 July 09 19:56 GMT
Last Published: 2015 July 09 19:56 GMT
Port: Not available
CVE: CVE-2015-4259
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 4.3
CVSS Version 2.0
CVSS Temporal: 4.1
Version Summary: Cisco Unified Computing System C-Series Servers contain a
vulnerability that could allow an unauthenticated, remote attacker to conduct
man-in-the-middle attacks. Updates are not available.
Description
A vulnerability in the Cisco Integrated Management Controller of the Cisco
Unified Computing System (UCS) C-Series Servers could allow an
unauthenticated, remote attacker to perform a man-in-the-middle attack against
the affected device.
The vulnerability is due to improper validation of the SSL certificate used to
manage the device. An attacker could exploit this vulnerability by using the
default SSL certificate to intercept, decrypt, read, and write information.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
At the time this alert was first published, Cisco UCS Releases 1.5(3) and
1.6(0.16) were vulnerable. Later releases of Cisco UCS may also be vulnerable.
IntelliShield Analysis
A successful exploit of this vulnerability could allow the attacker to impact
the confidentiality of information transmitted by the device by decrypting
encrypted content and accessing sensitive information, which could be used to
conduct further attacks.
The attacker may need access to trusted, internal networks to use the default
SSL certificate used to manage the device, making exploitation more difficult
in environments that restrict access to untrusted sources.
Cisco indicates through the CVSS score that functional exploit code exists;
however, the code is not known to be publicly available.
Vendor Announcements
Cisco has released bug IDs CSCum56133 and CSCum56177 for registered users,
which contains additional details and an up-to-date list of affected product
versions.
Impact
An unauthenticated, remote attacker could exploit this vulnerability to
intercept, decrypt, read, and write information between the affected device
and a device communicating with the affected device. A successful exploit
could be used to conduct further attacks.
Technical Information
The vulnerability is due to improper validation of the SSL certificate used to
manage an affected device.
An attacker could exploit this vulnerability by using the default SSL
certificate to intercept, decrypt, read, and write information between the
affected device and any device communicating with the targeted device.
Safeguards
Administrators are advised to contact the vendor regarding future updates and
releases.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to
allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
Patches/Software
Software updates are not available.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco Cisco Unified Computing System (Management Software) 1.5 (3) | 1.6 (0.16)
Cisco Cisco Unified Computing System (Standalone) 1.5 (3) | 1.6 (0.16)
Associated Products:
N/A
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are
highlighted by analysts in the Cisco Threat Operations Center and represent a
subset of the comprehensive content that is available through Cisco Security
IntelliShield Alert Manager Service. This customizable threat and
vulnerability alert service provides security staff with access to timely,
accurate, and credible information about threats and vulnerabilities that may
affect their environment.
LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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