Cisco Security Advisory
Cisco Small Business SRP500 Series Command Injection Vulnerability
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AV:N/AC:M/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C
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Cisco Small Business SRP500 Series Services Ready Platforms contain an operating system command injection vulnerability. The vulnerability can be exploited via a remote session to the Services Ready Platform Configuration Utility web interface.
Cisco has released software updates that address this vulnerability.
Workarounds that mitigate this vulnerability are available.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20111102-srp500.
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Vulnerable Products
The following Cisco Small Business SRP520 Series models are affected if running firmware prior to version 1.1.24:
- Cisco SRP521W
- Cisco SRP526W
- Cisco SRP527W
The following Cisco Small Business SRP540 Series models are affected if running firmware prior to version 1.2.1:
- Cisco SRP541W
- Cisco SRP546W
- Cisco SRP547W
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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Cisco Small Business SRP500 Series Services Ready Platforms are flexible, cost-effective, fixed-configuration customer premises equipment (CPE) with embedded intelligence to enable service providers to create, provision, and deploy premium revenue-generating services - a variety of high-quality IP voice, data, security, and wireless services - to small businesses on an as-needed basis.
Cisco Small Business SRP500 Series devices running affected versions of firmware contain the following vulnerability:
Cisco Small Business SRP500 Series Services Ready Platforms Command Injection Vulnerability
This vulnerability is documented in Cisco Bug ID CSCtr45124 (registered customers only) and has been assigned Common Vulnerabilities and Exposures (CVE) ID CVE-2011-4005.
For this vulnerability to be exploited, a remote attacker must either entice an administrator to access a crafted link or perform a man-in-the-middle attack, intercepting an authenticated session. The operating system commands that are injected are run in the context of the root user.
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The following mitigations help limit exposure to this vulnerability.
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Disable Remote Management
Caution: Do not disable remote management if administrators manage devices via the WAN connection. This action will result in a loss of management connectivity to the device.
Remote Management is enabled by default. Administrators can disable this feature by choosing Administration > Web Access Management. Change the setting for the Remote Management field to Disabled.
Disabling remote management limits exposure because the vulnerability can then be exploited from the inter-LAN network only.
- Limit Remote Management Access to Specific IP Addresses
If remote management is required, secure the device so that it can be accessed by certain IP addresses only, rather than the default setting of All IP Addresses. After choosing Administration > Web Access Management, an administrator can change the Allowed Remote IP Address setting to ensure that only devices with specified IP addresses can access the device.
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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.
This vulnerability has been fixed in the following firmware versions:
Affected Product
First Fixed Release
Cisco SRP521W
1.1.24
Cisco SRP526W
1.1.24
Cisco SRP527W
1.1.24
Cisco SRP541W
1.2.1
Cisco SRP546W
1.2.1
Cisco SRP547W
1.2.1
The latest Cisco Small Business SRP500 Series Services Ready Platforms firmware can be downloaded at http://www.cisco.com/cisco/software/navigator.html?mdfid=282736194&i=rm
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The Cisco PSIRT is not aware of any malicious use of the vulnerability described in this advisory. This vulnerability was demonstrated at a conference in San Jose, CA on November 2, 2011.
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 1.0
2011-November-2
Initial public release.
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