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AUSCERT External Security Bulletin Redistribution
ESB-2015.1429
Cisco Headend Digital Broadband Delivery System HTTP
Response-Splitting Vulnerability
1 June 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Headend Digital Broadband Delivery System
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Mitigation
CVE Names: CVE-2015-0733
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=38863
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Vulnerability Alert
Cisco Headend Digital Broadband Delivery System HTTP Response-Splitting
Vulnerability
Threat Type: CWE-20: Input Validation
IntelliShield ID: 38863
Version: 1
First Published: 2015 May 29 20:09 GMT
Last Published: 2015 May 29 20:09 GMT
Port: Not available
CVE: CVE-2015-0733
Urgency: Unlikely Use
Credibility: Confirmed
CVSS Base: 4.3
CVSS Temporal: 4.3
Version Summary: Cisco Headend Digital Broadband Delivery System contains a
vulnerability that could allow an unauthenticated, remote attacker to conduct
HTTP response-splitting attacks. Updates are not available.
Description
A vulnerability in the Cisco Headend Digital Broadband Delivery System could
allow an unauthenticated, remote attacker to conduct HTTP response-splitting
attacks.
The vulnerability is due to improper sanitization on user input performed by
the HTTP Header Handler within the affected software while handling HTTP
requests. An attacker could exploit this vulnerability by convincing a user to
follow a malicious HTTP URL with crafted carriage return-line feed (CRLF)
characters. When processed, such characters could allow the attacker to
execute arbitrary script code in the browser in the security context of the
affected site or to generate crafted responses for the user. This may allow
the attacker to conduct further attacks on the targeted system.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
Cisco Headend System Releases are affected.
IntelliShield Analysis
To exploit the vulnerability, the attacker may provide a link that directs a
user to a malicious site and use misleading language or instructions to
persuade the user to follow the provided link.
Vendor Announcements
Cisco has released bug ID CSCur25580 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
execute arbitrary code in the user's browser session in the context of the
affected site. A successful exploit could be leveraged to conduct further
attacks.
Technical Information
The vulnerability is due to improper sanitization on user input performed by
the HTTP Header Handler within the affected software while handling HTTP
requests.
An unauthenticated, remote attacker could exploit this vulnerability by
convincing a user to follow a malicious HTTP URL with CRLF characters. When
processed, such characters could allow the attacker to execute arbitrary
script code in the browser in the security context of the affected site or to
generate crafted responses for the user.
Safeguards
Administrators are advised to contact the vendor regarding future updates and
releases.
Users are advised not to open email messages from suspicious or unrecognized
sources. If users cannot verify that links or attachments included in email
messages are safe, they are advised not to open them.
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 Headend System Releases Original Release Base
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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