Cisco Security Advisory-
Cisco RVS4000 4-port Gigabit Security Routers and Cisco WRVS4400N Wireless-N Gigabit Security Routers have several web interface vulnerabilities that can be exploited by a remote, unauthenticated user.
Cisco has released software updates that address these vulnerabilities. Workarounds that mitigate these vulnerabilities are available. This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110525-rvs4000.
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Vulnerable Products
These vulnerabilities affect the following devices running firmware prior to the first fixed release documented in the Software Versions and Fixes section of this advisory:
- Cisco RVS4000 Gigabit Security Router (v1 and v2)
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Cisco WRVS4400N Wireless-N Gigabit Security Router (V1.0, V1.1, and
V2)
Note: The Cisco WRVS4400N Wireless-N Gigabit Security Router V1.0 and V1.1 have reached end of life, and no further firmware updates are being made available.
To check the version of system firmware that is running on the device, log into the device with the web management interface, and navigate to the screen: Setup --> Summary. Under System Information is a field labeled Firmware Version:. The number directly beside this field label is the system firmware version. An example would be V1.3.0.3.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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The Cisco RVS4000 and WRVS4400N Gigabit Security Routers deliver high-speed network access and IPsec VPN capabilities for small businesses. They also provides firewall and intrusion prevention capabilities.
The Cisco RVS4000 and WRVS4400N Gigabit Security Routers contain three web management interface vulnerabilities:
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Retrieval of the configuration file
If an administrator of the device has previously created a backup of the configuration, using Administration --> Backup & Restore --> Backup, it is possible for a remote unauthenticated user to access the backup configuration file. This file contains all configuration parameters of the device, including the HTTP authentication password and VPN pre-shared-keys (PSKs).
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Root operating system arbitrary command injection by an authenticated
attacker
A user who is authenticated to the device can inject arbitrary commands into the underlying operating system with root privileges, via the ping test and traceroute test parameters.
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Retrieval of admin SSL certificate private key
The admin SSL certificate private and public keys can be retrieved (used for Quick VPN) by a remote unauthenticated user.
These vulnerabilities are documented in Cisco bug ID CSCtn23871 ( registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) IDs:
- CVE-2011-1645: Retrieval of the configuration file
- CVE-2011-1646: Root operating system arbitrary command injection by an authenticated attacker
- CVE-2011-1647: Retrieval of admin SSL certificate private key
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Retrieval of the configuration file
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The following mitigations help limit the exposure to these vulnerabilities.
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Disable remote management
Caution: Do not disable remote management if you manage the device via the WAN connection. Doing so will result in loss of management connectivity to the device.
Remote Management is disabled by default. If it is enabled, administrators can disable it using the Firewall > Basic Settings screen. Change the setting for the field "Remote Management" to "Disabled".
Disabling remote management limits the exposure of the vulnerabilities to those on the local LAN.
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Limit remote management access to specific IP addresses
If remote management is required, harden the device so that it can be accessed only by certain IP addresses, rather than the default setting of "any". By entering the configuration screen at Firewall --> Basic Settings, an administrator can change the Remote IP address field to ensure only devices with the specified IP addresses can access the device.
The following mitigation can help limit the exposure to the vulnerability "Retrieval of the configuration file".
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Remove all backup configuration files from the device
Rebooting the device after performing a configuration backup, will remove the configuration file from the system so that it can not be retrieved by an unauthenticated user.
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Disable remote management
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When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Small Business Support Center or your contracted maintenance provider for assistance.
These vulnerabilities have been fixed in the following firmware versions:
Affected Product
Availability of First Fixed Release
RVS4000v1
1.3.3.5
RVS4000v2
2.0.2.7
WRVS4400Nv2
2.0.2.1
The latest Cisco RVS4000 Gigabit Security Router software can be downloaded at http://www.cisco.com/cisco/software/type.html?mdfid=282414013&flowid=787 ( registered customers only)
The latest Cisco WRVS4400N V2 Gigabit Security Router software can be downloaded at http://www.cisco.com/cisco/software/type.html?mdfid=282414016 ( registered customers only)
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The Cisco PSIRT is aware that these vulnerabilities have been made public at a conference on May 25th, 2011. The Cisco PSIRT is not aware of any malicious use of the vulnerabilities described in this advisory.
This vulnerability was reported to Cisco by Michal Sajdak of Securitum, Poland.
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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 LessRevision 1.1
2011-Jun-16
Modified software table to indicate that First Fixed release for RVS4000v1 is 1.3.3.5.
Revision 1.0
2011-May-25
Initial public release.
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