A vulnerability in the web framework code could allow an authenticated, remote attacker to execute arbitrary commands on the underlying operating system with elevated privileges.
The vulnerability is due to a failure to properly sanitize user supplied input that is subsequently utilized to perform an action that leverages the underlying command-line interface of the device. An authenticated but unprivileged attacker could exploit this vulnerability by sending a crafted URL to the affected system, or by convincing a valid user to click on a malicious URL. A successful exploit could allow an attacker with sufficient knowledge to take complete control of the affected device.
Cisco has confirmed the vulnerability in multiple security advisories and has released software updates.
Indicators of Compromise
The following Cisco products are vulnerable:
Cisco Web Security Appliance (WSA) prior to 7.7.0-550
Cisco Email Security Appliance (ESA) prior to 7.6.3-019
Cisco Content Security Management Appliance (SMA) prior to 7.9.1-102
The vulnerability is due to a failure to properly sanitize user-supplied input processed by the affected software. The vulnerability could be triggered by IPv4 or IPv6 traffic directed to the management IP addresses of the affected system via TCP port 80 or TCP port 443.
An authenticated but unprivileged attacker could exploit this vulnerability by sending a crafted URL to the affected system or by convincing a valid user to click a malicious URL. A successful exploit could allow an attacker with sufficient knowledge to take complete control of the affected device.
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the link. In addition, authentication is required to exploit the vulnerability. This access requirement could limit 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.
Administrators are advised to apply the appropriate updates.
Administrators may consider disabling management access to the GUI or restricting IP addresses that can access the management interface as mitigation strategies. Details about these actions are in the security advisories listed in the "Vendor Announcements" section of this alert.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at email@example.com
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.