Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:P/A:P/E:F/RL:U/RC:C
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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.
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.
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Cisco has released bug ID CSCug21497 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
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.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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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.
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Updates are not available.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Sep-09
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