#VU11361 Improper input validation in Cisco IOS XE


Published: 2018-03-30 | Updated: 2022-03-08

Vulnerability identifier: #VU11361

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-2018-0174

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 DHCP option 82 encapsulation functionality due to incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. A remote attacker can send a specially crafted DHCPv4 packet and cause the service to crash.

Mitigation
Update to versions 15.3(3)S2, 15.2(4)S5, 12.2(33)SRE10, 15.4(1)S0e, 15.4(1)S, 15.4(1.9.1)XEB, 15.4(1.8)S, 15.3(3)S2t, 15.3(3)S2a, 15.3(3)S1.4, 15.2(6)E1, 15.2(6.5.9i)E1, 15.2(6.4.85i)E1, 15.2(4.7.5)EA7, 15.0(1.9.1)SQD8 or 12.2(60)EZ13.

Vulnerable software versions

Cisco IOS XE: 12.2.33 SRE7a


External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3


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.


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