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AUSCERT External Security Bulletin Redistribution
ESB-2014.2236
Cisco IOS XR Software lighttpd TCP Session Vulnerability
27 November 2014
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AusCERT Security Bulletin Summary
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Product: Cisco IOS XR
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-8005
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=36532
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Vulnerability Alert
Cisco IOS XR Software lighttpd TCP Session Vulnerability
Threat Type: CWE-362: Race Conditions
IntelliShield ID: 36532
Version: 1
First Published: 2014 November 25 22:45 GMT
Last Published: 2014 November 25 22:45 GMT
Port: Not available
CVE: CVE-2014-8005
BugTraq ID: 71287
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage CVSS Base: 5.0
CVSS Temporal: 4.1
Version Summary: Cisco IOS XR Software contains a vulnerability that could
allow an unauthenticated, remote attacker to cause a denial of service
condition. Updates are available.
Description
A vulnerability in the lighttpd module of Cisco IOS XR could allow an
unauthenticated, remote attacker to cause a reload of the affected lighttpd
process.
The vulnerability is due to a race condition while handling TCP sessions to
the lighttpd module on the affected Cisco IOS XR device. An attacker could
exploit this vulnerability by sending a number of TCP sessions to be
established with the lighttpd server on the affected device. An exploit could
allow the attacker to cause a reload of the lighttpd process.
Cisco has confirmed the vulnerability in a security notice and released
software updates.
Warning Indicators
At the time this alert was first published, Cisco IOS XR Software for Cisco
Network Convergence System 6000 Series devices Releases 5.1 and prior were
vulnerable. Later releases may also be vulnerable.
IntelliShield Analysis
To exploit this vulnerability, an attacker may need access to trusted,
internal networks behind a firewall to send numerous TCP sessions to the
targeted device. This access requirement may reduce the likelihood of a
successful exploit.
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 a security notice at the following link: CVE-2014-8005
Customers are advised to consult Cisco bug ID CSCuq45239 for a complete list
of affected product versions.
Impact
An unauthenticated, remote attacker could exploit this vulnerability to cause
the lighttpd process on an affected device to reload, resulting in a denial of
service (DoS) condition.
Technical Information
The vulnerability is due to a race condition while handling TCP sessions to
the lighttpd module on an affected Cisco IOS XR device.
An unauthenticated, remote attacker could exploit this vulnerability by
sending a number of TCP sessions to be established with the lighttpd server on
the affected device. An exploit could allow the attacker to cause a reload of
the lighttpd process, resulting in a DoS condition.
Safeguards
Administrators are advised to apply the appropriate updates.
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
Cisco customers with active contracts should contact their Cisco support team
for assistance in upgrading to a software version that includes fixes for this
vulnerability. Cisco customers without contracts may contact the Cisco
Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email
at tac@cisco.com for assistance.
Alert History
Initial Release
Product Sets
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco Cisco IOS XR Software 5.1 Base | for Cisco Network Convergence System
6000 Series Routers 5.0.0, 5.0.1
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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