Vulnerability identifier: #VU11351

Vulnerability risk: Low

CVSSv3.1: 9.2 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2018-0167

CWE-ID: CWE-120

Exploitation vector: Local network

Exploit availability: No

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

Vendor: Cisco Systems, Inc

Description

The vulnerability allows an adjacent unauthenticated attacker to cause DoS condition or execute arbitrary code with elevated privileges on the target system.

The weakness exists in the LLDP subsystem due to improper error handling of malformed LLDP messages. An adjacent attacker can submit a specially crafted LLDP protocol data unit (PDU), trigger buffer overflow, cause the service to crash or execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to versions 5.2.21, 5.2.2, 5.2.1, 5.2.0.21i.FWDG, 5.2.0, 5.1.4, 5.1.3.12i.FWDG, 5.1.3, 16.5(1.315), 16.3(5.44), 15.7(3.1.14A)OT, 15.7(3.1.8A)OT, 15.7(3.1.4N)OT, 15.7(2.0r)M, 15.6(3)M3, 15.6(3)M2.2, 15.6(2.13)SP3, 15.6(2)SP4, 15.5(3)S6.15, 15.5(3)M6, 15.5(1.0.93)SY1, 15.5(1)SY1, 15.5(1)IC1.73, 15.5(1)IA1.511, 15.4(3)S9, 15.4(3)S8.7, 15.4(3)M9, 15.4(1.1.20)SY4, 15.4(1)SY4, 15.3(3)JPC7, 15.3(3)JG, 15.3(3)JF2, 15.3(3)JDA13, 15.3(3)JDA12, 15.3(3)JD13, 15.3(3)JD12, 15.2(6.5.1i)E1, 15.2(6.4.66i)E1, 15.2(6)E1, 15.2(6)E0c, 15.2(4.7.10)EA7, 15.2(2)E8, 15.2(1)SY6, 15.2(1)SY5.98, 15.1(2)SY11.60, 15.0(1.9.1)SQD8, 12.2(60)EZ13, 10.2(171.47), 8.8(1.58), 8.7(1.133), 8.6(101.0), 8.6(1.179), 8.5(110.0), 8.5(107.104), 8.3(140.0), 8.3(135.3), 8.3(134.90), 8.3(134.87), 8.3(134.81), 8.2(167.7), 8.2(167.6), 8.0(152.6) or 8.0(152.5).

Vulnerable software versions

Cisco IOS XE: 5.2.0 - 15.4.3 M4.1

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

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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 local network (LAN).

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.