A vulnerability in the certificate generation process in the admin web interface of the Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to execute arbitrary commands on an affected system with root-level privileges. The vulnerability is due to the improper validation of parameters passed to the affected system scripts. An attacker could exploit this vulnerability by passing arbitrary commands as arguments to the affected fields of the web interface. An exploit could allow the attacker to run arbitrary commands on the underlying system with root-level privileges. Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151104-wsa
ciscowsa> version Current Version =============== Product: Cisco IronPort S670 Web Security Appliance Model: S670 Version: 7.5.1-079
When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to upgrade
contain sufficient memory and confirm that current hardware and
software configurations will continue to be supported properly by the
new release. If the information is not clear, customers are advised to
contact the Cisco Technical Assistance Center (TAC) or their contracted
maintenance providers.
| Cisco AsyncOS for WSA Major Release | First Fixed Release for This Vulnerability | First Fixed Release for This Vulnerability and All Vulnerabilities Described in the Companion Advisories |
|---|---|---|
| Prior to 7.7 | Not affected | 7.7.0-761 or later |
| 7.7 |
Not affected |
7.7.0-761 |
| 8.0 | 8.0.8-113 | 8.0.8-113 or later |
| 8.1 | Affected; migrate to 8.5.3-051 or later | Affected; migrate to 8.5.3-051 or later |
| 8.5 | 8.5.3-051 | 8.5.3-051 or later |
| 8.6 | Affected; migrate to 8.7.0-171-LD or later | Affected; migrate to 8.7.0-171-LD or later |
| 8.7 | 8.7.0-171-LD | 8.7.0-171-LD or later |
| 8.8 | 8.8.0-085 | 8.8.0-085 or later |
| 9.0 | Not affected | Not affected |
In most cases a WSA can be updated over the network by using the System Upgrade options in the System Administration GUI. To upgrade a device by using the System Administration GUI:
After the upgrade is complete, the device reboots.
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.
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.
| Version | Description | Section | Status | Date |
|---|---|---|---|---|
| 1.1 | Added steps for upgrading a device by using the GUI. | Fixed Software | Final | 2015-November-20 |
| 1.0 | Initial public release. | - | Final | 2015-November-04 |
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