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Cisco Catalyst 6000, 6500 Series and Cisco 7600 Series NAM (Network
Analysis Module) Vulnerability
------------------------------------------------------------------------
SUMMARY
Cisco Catalyst 6000, 6500 series and Cisco 7600 series that have a Network
Analysis Module installed are vulnerable to an attack, which could allow
an attacker to gain complete control of the system. Only Cisco Catalyst
systems that have a NAM on them are affected. This vulnerability affects
systems that run Internetwork Operating System (IOS) or Catalyst Operating
System (CatOS).
DETAILS
Affected Products:
Vulnerable Products:
Catalyst 6000, 6500 series and Cisco 7600 series that have a NAM installed
in them are affected. A system that has a NAM can be identified by the
show module command. A NAM will be seen as WS-SVC-NAM-1, WS-SVC-NAM-2 or
WS-X6380-NAM in this output.
This vulnerability affects systems that run IOS or CatOS.
A sample output for a system that has a NAM-2 on it is provided below:
Cat6k#show module
Mod Ports Card Type Model
Serial No.
--- ----- -------------------------------------- ------------------
-----------
1 2 Catalyst 6000 supervisor 2 (Active) WS-X6K-SUP2-2GE
SAL06417E23
3 48 48 port 10/100 mb RJ-45 ethernet WS-X6248-RJ-45
SAD050108R4
5 8 8 port 1000mb ethernet WS-X6408-GBIC
SAD041300CL
6 8 Network Analysis Module WS-SVC-NAM-2
SAD093002AM
Products Confirmed Not Vulnerable:
* Catalyst 6000, 6500 and Cisco 7600 series that do not have a NAM are
not affected.
* Network Analysis Modules for Cisco Branch Routers (NM-NAM) are not
affected.
No other Cisco products are known to be affected by this vulnerability.
Details:
NAMs are deployed in Catalyst 6000, 6500 series and Cisco 7600 series to
monitor and analyze network traffic by using Remote Monitoring (RMON),
RMON2, and other MIBs. More information about NAMs can be found at the
following URL:
<http://www.cisco.com/en/US/products/hw/switches/ps708/products_module_configuration_guide_chapter09186a0080394e09.html>
http://www.cisco.com/en/US/products/hw/switches/ps708/products_module_configuration_guide_chapter09186a0080394e09.html
NAMs communicate with the Catalyst system by using the Simple Network
Management Protocol (SNMP). By spoofing the SNMP communication between the
Catalyst system and the NAM an attacker may obtain complete control of the
Catalyst system.
Devices running both Cisco IOS and Cisco CatOS are affected by this
vulnerability. This vulnerability is introduced in CatOS at 7.6(15) and
8.5(1). Older CatOS images are not vulnerable.
This issue is documented in bug IDs
<http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCsd75273>
CSCsd75273 ( registered customers only) ,
<http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCse52951>
CSCse52951 ( registered customers only) for IOS and
<http://www.cisco.com/pcgi-bin/Support/Bugtool/onebug.pl?bugid=CSCse39848>
CSCse39848 ( registered customers only) for CatOS.
Impact:
By successfully exploiting this vulnerability, an attacker may gain
complete control of the device.
Workarounds:
No workarounds exist for this vulnerability.
This vulnerability requires an attacker to spoof SNMP packets from the IP
address of the NAM. Filtering SNMP traffic to an affected device can be
used as a mitigation. Filtering SNMP traffic needs to be done on systems
that are deployed in front of an affected device, since it is ineffective
to filter against such spoofed packets on the device itself.
Anti-spoofing measures and infrastructure access-lists can also be
deployed at your network edge as a potential mitigation technique. Refer
to <http://www.cisco.com/warp/public/707/iacl.html>
http://www.cisco.com/warp/public/707/iacl.html for examples on how to
apply ACLs on Cisco routers for infrastructure protection.
Additional mitigations that can be deployed on Cisco devices within the
network are available in the Cisco Applied Intelligence companion document
for this advisory:
<http://www.cisco.com/warp/public/707/cisco-air-20070228-nam.shtml>
http://www.cisco.com/warp/public/707/cisco-air-20070228-nam.shtml.
ADDITIONAL INFORMATION
The information has been provided by <mailto:psirt@cisco.com> Cisco
Systems Product Security Incident Response Team.
The original article can be found at:
<http://www.cisco.com/warp/public/707/cisco-sa-20070228-nam.shtml>
http://www.cisco.com/warp/public/707/cisco-sa-20070228-nam.shtml
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