#VU8682 Improper input validation in Cisco IOS - CVE-2017-12237

Vulnerability identifier: #VU8682

Vulnerability risk: Low

CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2017-12237

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the Internet Key Exchange Version 2 (IKEv2) module due to an error when processing certain IKEv2 packets. A remote attacker can send specially crafted IKEv2 packets to the device and cause high CPU utilization, traceback messages, or a device reload.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco IOS: 15.0, 15.1(2.0) - 15.1, 15.2E - 15.2(5c)E, 15.3S - 15.3, 15.4S - 15.4.2 S, 15.5S - 15.5.3 S2.9

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-ike

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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.