Title: Cisco CBOS Multiple TCP Connection Denial of Service Vulnerability
Severity: HIGH
Description:
CBOS is the Cisco Broadband Operating System, firmware designed for use on Cisco 600 series routers. It is maintained and distributed by Cisco Systems.
A problem in CBOS makes it possible for a remote user to crash the router. The problem is related to the handling of multiple TCP connections to administrative ports on the router.
By default, CBOS provides administrative interfaces on ports 21 for command line administration, and 80 for web-based administration. These interfaces allow a user remote access to the configuration features of the router.
CBOS becomes unstable when it receives multiple connections via telnet. Upon establishing more than telnet session, the router will stop passing traffic, and stop responding to all configuration attempts. The router requires a reboot to resume normal operation.
Additinally, CBOS displays the same behavior with it's web administration interface. Upon receiving more than one session via port 80, the router becomes unstable, and stops responding to configuration attempts. This also requires a reboot of the router.
The port 80 problem is compounded by the fact that when the web administration interface is disabled, the port continues to listen on the network for connections. It's possible for a remote user to launch multiple connections to the web interface, causing the router to become unstable.
This problem affects the following Cisco 600 series routers: 627, 633, 673, 675, 675E, 677, 677i and 678.
Affected Products:
- Cisco CBOS 2.0.1
- Cisco CBOS 2.1.0
- Cisco CBOS 2.1.0 a
- Cisco CBOS 2.2.0
- Cisco CBOS 2.2.1
- Cisco CBOS 2.2.1 a
- Cisco CBOS 2.3.0
- Cisco CBOS 2.3.2
- Cisco CBOS 2.3.5
- Cisco CBOS 2.3.7
- Cisco CBOS 2.3.8
- Cisco CBOS 2.3.9
- Cisco CBOS 2.4.1
- Cisco CBOS 2.4.2
- Cisco CBOS 2.4.2 ap
References:
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