CVE-2017-6770 : What You Need to Know
Learn about CVE-2017-6770 affecting Cisco networking devices. Understand the OSPF Routing Protocol vulnerability, its impact, affected systems, exploitation mechanism, and mitigation steps.
Cisco networking devices running certain versions of IOS, ASA Software, NX-OS, and IOS XE are at risk due to a vulnerability in the OSPF Routing Protocol Link State Advertisement (LSA) database. This flaw could potentially allow an unauthorized remote attacker to gain complete control over the routing table of the OSPF Autonomous System (AS) domain, enabling interception or redirection of traffic.
Understanding CVE-2017-6770
This CVE involves a vulnerability in the OSPF Routing Protocol Link State Advertisement (LSA) database on Cisco networking devices.
What is CVE-2017-6770?
The vulnerability in the OSPF Routing Protocol LSA database could allow unauthorized remote attackers to manipulate routing tables, intercept, or redirect traffic by injecting crafted OSPF packets.
The Impact of CVE-2017-6770
- Unauthorized remote attackers could gain complete control over the OSPF AS domain routing table
- Potential interception or redirection of traffic
- Manipulation of OSPF LSA type 1 updates
Technical Details of CVE-2017-6770
Cisco networking devices running specific versions of IOS, ASA Software, NX-OS, and IOS XE are affected by this vulnerability.
Vulnerability Description
- Exploitable flaw in the OSPF Routing Protocol LSA database
- Attack involves injecting manipulated OSPF packets
- Successful exploitation leads to routing table clearance and spread of manipulated OSPF LSA type 1 update
Affected Systems and Versions
- Cisco IOS 12.0 through 15.6
- Adaptive Security Appliance (ASA) Software 7.0.1 through 9.7.1.2
- NX-OS 4.0 through 12.0
- IOS XE 3.6 through 3.18
Exploitation Mechanism
- Attacker must send specifically crafted unicast or multicast OSPF LSA type 1 packets
- Only LSA type 1 packets can trigger the vulnerability
Mitigation and Prevention
Immediate Steps to Take:
- Apply vendor-supplied patches
- Monitor network traffic for signs of exploitation
Long-Term Security Practices:
- Regularly update and patch networking devices
- Implement network segmentation and access controls
Patching and Updates:
- Cisco has released patches to address this vulnerability