‫ Cisco IOS fixes 10 denial-of-service vulnerabilities

ID: IRCNE2013091969
Date: 2013-09-28
 
According to "computerworld", Cisco Systems has patched 10 vulnerabilities that could affect the availability of devices using various versions of its IOS software.
IOS is a multitasking operating system that combines networking and telecommunications functions and is used on many of the company's networking devices.
All of the patched vulnerabilities can affect a device's availability if exploited. They affect Cisco IOS implementations of the Network Time Protocol (NTP), the Internet Key Exchange protocol, the Dynamic Host Configuration Protocol (DHCP), the Resource Reservation Protocol (RSVP), the virtual fragmentation reassembly (VFR) feature for IP version 6 (IPv6), the Zone-Based Firewall (ZBFW) component, the T1/E1 driver queue and the Network Address Translation (NAT) function for DNS (Domain Name System) and PPTP (Point-to-Point Tunneling Protocol).
These vulnerabilities can be exploited by remote, unauthenticated attackers by sending specifically crafted packets over the network to IOS devices that have the affected features enabled.
Depending on the targeted vulnerability, attackers can cause the affected devices to hang, reload, lose connection, lose their ability to route connections or trigger other types of denial-of-service (DoS) conditions.
To mitigate the other vulnerabilities, users will have to install patched versions of the IOS software, depending on which versions their devices already use.
The company is not aware of any malicious exploitation or detailed public disclosure of these vulnerabilities. They were discovered during internal security reviews or while troubleshooting customer service reports.
 

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