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AUSCERT External Security Bulletin Redistribution
ESB-2015.2466
Cisco Secure Access Control Server SSH Login Denial of
Service Vulnerability
22 September 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Secure Access Control Server
Publisher: Cisco Systems
Operating System: Cisco
VMware ESX Server
Impact/Access: Denial of Service -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2015-6300
Original Bulletin:
http://tools.cisco.com/security/center/viewAlert.x?alertId=41087
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Vulnerability Alert
Cisco Secure Access Control Server SSH Login Denial of Service Vulnerability
Threat Type: CWE-20: Input Validation
IntelliShield ID: 41087
Version: 1
First Published: 2015 September 18 14:17 GMT
Last Published: 2015 September 18 14:17 GMT
Port: Not available
CVE: CVE-2015-6300
Urgency: Unlikely Use
Credibility: Confirmed
Severity: Mild Damage
CVSS Base: 4.0
CVSS Temporal: 3.8
Version Summary: Cisco Secure Access Control Server contains a vulnerability
that could allow an authenticated, remote attacker to cause a denial of
service condition. Updates are not available.
Description
A vulnerability in the Secure Shell (SSH) feature of the Cisco Secure Access
Control Server (ACS) could allow an authenticated, remote attacker to cause a
partial denial of service (DoS) condition due to the SSH screen process
unexpectedly terminating.
The vulnerability is due to improper input validation of user commands entered
at the command line interface (CLI) or GUI. An attacker could exploit this
vulnerability by logging into the affected device and executing crafted user
commands. An exploit could allow the attacker to cause a partial DoS due to
the SSH screen processes unexpectedly terminating. That SSH connection is then
lost and the user must log in and authenticate again.
Cisco has confirmed the vulnerability; however, software updates are not
available.
Warning Indicators
At the time this alert was first published, Cisco Secure ACS Solution Engine
release 5.7(0.15) was vulnerable. Later releases of Cisco Secure ACS Solution
Engine may also be vulnerable.
IntelliShield Analysis
To exploit this vulnerability, an attacker must authenticate 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 bug ID CSCuw24694 for registered users, which contains
additional details and an up-to-date list of affected product versions.
Impact
An authenticated, remote attacker could exploit this vulnerability to cause
the SSH screen process to unexpectedly terminate, resulting in a DoS
condition.
Technical Information
The vulnerability is due to improper input validation of user commands entered
at the CLI or GUI on an affected device.
An authenticated, remote attacker could exploit this vulnerability by logging
into the affected device and executing crafted user commands. A successful
exploit could allow the attacker to cause a partial DoS due to the SSH screen
processes unexpectedly terminating.
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 are advised to allow only privileged users to access
administration or management 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 Secure Access Control Server Solution Engine (ACSE) 5.7 .0.15
Associated Products:
N/A
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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