Remote denial of service in Cisco IOS

1) Improper input validation

EUVDB-ID: #VU6181

Risk: High

CVSSv4.0: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2016-1409

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service attack.

The vulnerability exists due to a logic error when parsing IPv6 Neighbor Discovery (ND) packets, sent directly to the device. A remote attacker can send specially crafted IPv6 traffic to the affected device and cause the device to stop processing IPv6 traffic.

Successful exploitation of the vulnerability will result in denial of service attack.

Note: according to Cisco, this vulnerability is being exploited in the wild.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Cisco IOS XR: All versions

Cisco IOS: All versions

Cisco IOS XE: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios_xr:*:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios:*:*:*:*:*:*:*:*
• cpe:2.3:o:cisco_systems:cisco_ios_xe:*:*:*:*:*:*:*:*

External links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160525-ipv6

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.