Improper input validation in Cisco IOS XE - CVE-2018-0159

Vulnerability identifier: #VU11354

CSH Severity: Medium

CVSS v4.0: 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:Green

CVE-ID: CVE-2018-0159

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

Vendor: Cisco Systems, Inc

Affected software:
Cisco IOS XE

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

The weakness exists in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality due to improper validation of specific IKEv1 packets. A remote attacker can send specially crafted IKEv1 packets during an IKE negotiation and cause the service to crash.

Update to evrsions 15.4(2)S, 15.7(3.1.11D)OT, 15.6(1)SN, 15.5(0)IA1.1, 15.4(2)T1, 15.4(2)T, 15.4(2)SN1, 15.4(2)SN, 15.4(2)S1, 15.4(2)CG, 15.4(2.1.1)S, 15.4(1)IA1.1, 15.4(1.13)S, 15.4(1.12)T, 15.4(1.9.2)XEB, 15.3(3)JPC7, 15.3(3)JPC6, 15.3(3)JPC5, 15.3(3)JF2, 15.3(3)JF, 15.3(3)JE, 15.3(3)JD7, 15.3(3)JD5, 15.3(3)JD3, 15.3(3)JC6, 15.3(3)JA11, 15.3(1)IE101.209, 15.2(6.3.0i)E, 15.2(5.0)ST, 15.2(4.0)ST, 15.2(4.0.64a)E, 15.2(4.0.21)E, 15.2(2)E8, 15.2(1)SY2, 15.2(1)SY1.13, 15.1(2)SY11.64, 12.2(60)EZ13 or 12.2(33)CY2.

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-ike-dos