Vulnerability identifier: #VU11337

Vulnerability risk: Medium

CVSSv3.1: 8.2 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-0156

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: Cisco Systems, Inc

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

The weakness exists in the Smart Install feature due to improper validation of packet data. A remote attacker can send a specially crafted packet to an affected device on TCP port 4786 and cause the service to crash.

Mitigation
Update to versions 16.3(5.72), 15.7(3.1.14A)OT, 15.7(3.1.9W)OT, 15.7(3.0u)M, 15.7(3)M1, 15.7(2.0v)M0.6, 15.6(3)M3.1, 15.5(3)M7, 15.5(3)M6.1, 15.5(1.0.91)SY1, 15.5(1)SY1, 15.5(1)IC1.73, 15.5(1)IA1.516, 15.4(3)M9, 15.4(1.1.21)SY4, 15.4(1)SY4, 15.2(6.5.1i)E1, 15.2(6.4.66i)E1, 15.2(6.3.0i)E, 15.2(6.2.20i)E, 15.2(6)E1, 15.2(4.7.8)EA7, 15.2(2)E8, 15.2(1)SY6, 15.2(1)SY5.114, 15.1(2)SY11.62 or 12.2(60)EZ13.

Vulnerable software versions

Cisco IOS XE: 15.2.2 E4 - 15.2.2a JA

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi

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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.