Cisco WSA, ESA, and SMA contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are not available.
A vulnerability in the GUI function in the web framework code could allow an unauthenticated, remote attacker to cause the GlassFish process to become unresponsive, resulting in a partial denial of service (DoS) condition.
The vulnerability is due to improper handling, processing, and termination of HTTP and HTTPS connections. An attacker could exploit this vulnerability by sending multiple HTTP or HTTPS requests to any management-enabled interfaces of the affected system. A full TCP three-way handshake is required to exploit this vulnerability. An exploit could allow the attacker to prevent management access via the GUI. A hard reboot of the affected system is needed to restore full functionality.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
At the time this alert was first published, the following versions of Cisco products were vulnerable. Later versions of Cisco products may also be affected.
Cisco Web Security Appliance (WSA) versions 7.7 and prior
Cisco Email Security Appliance (ESA) versions 8.0 and prior
Cisco Content Security Management Appliance (SMA) versions 8.1 and prior
To exploit this vulnerability, an attacker must first determine the management-enabled interfaces on the targeted system and send multiple HTTP or HTTPS requests to the system. In a typical enterprise environment, these systems would reside on trusted, internal networks behind firewall restrictions. This access requirements decrease 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.
Cisco has released a security notice at the following link: CVE-2013-5537
An unauthenticated, remote attacker could exploit this vulnerability to cause the GlassFish process to become unresponsive, which would prevent management access via the GUI, resulting in a DoS condition.
The vulnerability is due to improper handling, processing, and termination of HTTP and HTTPS connections by the GUI function of the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by sending multiple HTTP or HTTPS requests to any management-enabled interfaces of the affected system. An exploit could allow the attacker to prevent management access via the GUI, resulting in a DoS condition.
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 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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