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             AUSCERT External Security Bulletin Redistribution

                               ESB-2015.2372
        Cisco Email Security Appliance Format String Vulnerability
                             10 September 2015

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco Email Security Appliance
Publisher:         Cisco Systems
Operating System:  Cisco
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2015-6285  

Original Bulletin: 
   http://tools.cisco.com/security/center/viewAlert.x?alertId=40844

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Vulnerability Alert

Cisco Email Security Appliance Format String Vulnerability

Threat Type:		CWE-134: Format String Vulnerability
IntelliShield ID:	40844
Version:		1
First Published:	2015 September 09 18:02 GMT
Last Published:		2015 September 09 18:02 GMT
Port:			Not available
CVE:			CVE-2015-6285
Urgency:		Unlikely Use
Credibility:		Confirmed
Severity:		Mild Damage
CVSS Base:		5.8
CVSS Temporal:		5.5

Version Summary:
Cisco Email Security Appliance contains a vulnerability that could allow
an unauthenticated, remote attacker to cause a denial of service condition
on the affected device. Updates are not available.

Description
The Cisco Email Security Appliance (ESA) contains a vulnerability that
could allow an unauthenticated, remote attacker to impact the integrity
and availability of services and data on the affected device. The impact
includes a partial denial of service (DoS). In addition, the attacker
could override part of the memory of the affected device.

The vulnerability is due to improper validation of string input in the
web application. An attacker could exploit this vulnerability by sending
a crafted HTTP request to the affected device. A successful exploit could
allow the attacker to impact the integrity and availability of services
and data of the device, including a partial DoS condition.

Cisco has confirmed the vulnerability; however, software updates are
not available.

Warning Indicators
At the time this alert was first published, Cisco Email Security Appliance
versions 7.6.0 and 8.0.0 were affected. Later versions of Cisco ESA may
also be affected.

IntelliShield Analysis
To exploit the vulnerability, the attacker would need to send crafted
HTTP requests to the targeted system through the web application. Because
the attacker does not need to authenticate to send the crafted request,
the likelihood of a DoS condition or partial memory override is increased.

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 CSCug21497 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
cause a DoS condition or partial memory override on the affected device.

Technical Information
The vulnerability is due to improper validation of string input in the
web application.

An attacker could exploit this vulnerability by sending crafted HTTP
requests to the targeted device. Processing such requests could allow the
unauthenticated, remote attacker to cause a DoS condition or partial memory
override on the targeted device.

Safeguards
Administrators are advised to contact the vendor regarding future updates
and releases.

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
Updates are not available.

Alert History

Initial Release

Product Sets

The security vulnerability applies to the following combinations of products.

Primary Products:
Cisco	Cisco Email Security Appliance (ESA)	7.6 .0 | 8.0 Base

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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