Menu
Cisco patches traffic snooping flaw in operating systems used by its networking gear

Cisco patches traffic snooping flaw in operating systems used by its networking gear

The vulnerability affects the OSPF routing protocol implementation on Cisco networking equipment

Cisco Systems said attackers could disrupt or intercept traffic in many of its networking products unless a new security update is applied to the software they run.

The issue affects the implementation of the Open Shortest Path First (OSPF) routing protocol and its Link State Advertisement (LSA) database in particular. This protocol is used for determining the shortest routing paths inside an Autonomous System (AS) -- a collection of routing policies for IP (Internet Protocol) addresses controlled by ISPs and large organizations.

The OSPF protocol is commonly used on large enterprise networks. It gathers link state information from available routers into a database in order to built a network topology map which is then used to determine the best route for IP traffic.

"This vulnerability could allow an unauthenticated attacker to take full control of the OSPF Autonomous System (AS) domain routing table, blackhole traffic, and intercept traffic," Cisco said in a security advisory.

Exploiting the vulnerability doesn't require authentication and can be achieved remotely by sending specifically crafted OSPF LSA type 1 packets via unicast or multicast to the vulnerable device. The packets could contain false routes that would then get propagated throughout the entire OSPF AS domain.

However, the attacker does need to determine some information in advance in order to launch a successful attack, Cisco said. This information includes the network placement and IP address of the targeted router, the LSA database sequence numbers and the router ID of the OSPF Designated Router (DR).

The vulnerability affects networking devices running most versions of Cisco IOS, IOS-XE and NX-OS operating systems if they are configured for OSPF operations. It also affects the software running on the Cisco Adaptive Security Appliance (ASA), Cisco ASA Service Module (ASA-SM), Cisco Pix Firewall, Cisco Firewall Services Module (FWSM) and the Cisco ASR 5000 carrier class platform.

The Cisco advisory contains a table with the vulnerable software releases and the updates available for them, if any. Instructions for enabling OSPF authentication, which can mitigate the vulnerability, are described in a separate technical document.

Follow Us

Join the New Zealand Reseller News newsletter!

Error: Please check your email address.

Tags patchesnetworking hardwareCisco SystemsNetworkingsecuritypatch managementExploits / vulnerabilities

Slideshows

Top 50 defining moments of the New Zealand channel in 2016

Top 50 defining moments of the New Zealand channel in 2016

Reseller News looks back on a tumultuous 12 months for the New Zealand channel, assessing the fallout from a year of sizeable industry change. Whether it be local or global mergers and acquisitions, distribution deals or job changes, the channel that started the year differs somewhat to the one set to finish it - Reseller News assesses the key moments that made 2016.​

Top 50 defining moments of the New Zealand channel in 2016
​Hewlett Packard Enterprise honours high achieving NZ channel

​Hewlett Packard Enterprise honours high achieving NZ channel

Hewlett Packard Enterprise honoured its top performing Kiwi partners at the second running of its HPE Partner Awards in New Zealand, held at a glitzy ceremony in Auckland. Recognising excellence across eight categories - from distributors to resellers - the tech giant celebrated its first year as a standalone company, following its official split from HP in 2015.

​Hewlett Packard Enterprise honours high achieving NZ channel
Nutanix treats channel partners to Christmas cruise

Nutanix treats channel partners to Christmas cruise

Nutanix recently took to the seas for a Christmas Cruise around Sydney Harbour with its Australia and New Zealand staff, customers and partners to celebrate a stellar year for the vendor. With the sun out, they were all smiles and mingled over drinks and food.

Nutanix treats channel partners to Christmas cruise
Show Comments