Cisco IOS Software TCP Denial of Service Vulnerability - Cisco Systems

This script is (C) 2010-2014 Tenable Network Security, Inc.


Synopsis :

The remote device is missing a vendor-supplied security patch

Description :

Cisco IOS Software Release, 15.1(2)T is affected by a denial of
service (DoS) vulnerability during the TCP establishment phase. The
vulnerability could cause embryonic TCP connections to remain in a
SYNRCVD or SYNSENT state. Enough embryonic TCP connections in these
states could consume system resources and prevent an affected device
from accepting or initiating new TCP connections, including any
TCP-based remote management access to the device. No authentication is
required to exploit this vulnerability. An attacker does not need to
complete a three-way handshake to trigger this vulnerability

therefore, this vulnerability can be exploited using spoofed packets.
This vulnerability may be triggered by normal network traffic. Cisco
has released Cisco IOS Software Release 15.1(2)T0a to address this
vulnerability.

See also :

http://www.nessus.org/u?f433a13e
http://www.nessus.org/u?322225c0

Solution :

Apply the relevant patch referenced in Cisco Security Advisory
cisco-sa-20100812-tcp.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: CISCO

Nessus Plugin ID: 49056 (cisco-sa-20100812-tcphttp.nasl)

Bugtraq ID: 42426

CVE ID: CVE-2010-2827