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Category:   Application (Generic)  >   Cisco Application and Content Networking System Vendors:   Cisco
Cisco Application and Content Networking System (ACNS) Uses Common Default Password and Has Packet Processing Bugs that Permit Remote Denial of Service Attacks
SecurityTracker Alert ID:  1013286
SecurityTracker URL:  http://securitytracker.com/id/1013286
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Feb 24 2005
Impact:   Denial of service via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.2 and prior versions
Description:   Several vulnerabilities were reported in Cisco's Application and Content Networking System (ACNS) softwarwe. A remote user can cause denial of service conditions. A remote user can also gain administrative access using a common default password.

When configured as a transparent proxy server, forward proxy server, or reverse proxy server, a remote user can trigger four different bugs to cause denial of service conditions.

A remote user can send a specially crafted TCP connection to cause the ACNS cache process to restart. Cached information will be lost, causing degradation of response to web browser content requests.

A remote user can send certain specially crafted IP packets to cause 100% CPU utilization on the target device. A reboot is required to return the system to normal operations.

A remote user can send certain specially crafted packets to cause a RealServer RealSubscriber to consume 100% of the CPU resources on the target device. A reboot of the target device is required to return to normal operations.

A remote user can send certain specially crafted IP packets to cause the target device to continuously forward copies of the packet until network capacity is fully consumed. A reboot of the target device is required to return to normal operations.

The administrative password is set to a common, default password. If the ACNS setup dialog has not been previously run or if the administrative password has not been manually changed, then a remote user can use the password to gain administrative access.

Cisco has assigned the following Cisco Bug IDs to these vulnerabilities: CSCef27476, CSCef30460, CSCeg49648, CSCeg23731, and CSCef30743.

Impact:   A remote user can cause various types of denial of service conditions, including 100% CPU utilitzation and 100% network segment utilization.

A remote user can use a default password to gain administrative access on the target device.

Solution:   The vendor has released fixed versions. See the Cisco advisory for a patch matrix:

http://www.cisco.com/en/US/products/products_security_advisory09186a00803ed8a7.shtml

Vendor URL:  www.cisco.com/en/US/products/products_security_advisory09186a00803ed8a7.shtml (Links to External Site)
Cause:   Configuration error, Exception handling error, Input validation error

Message History:   None.


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