Vulnerability identifier: #VU12387

Vulnerability risk: Low

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0234

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco Aironet 1850 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc

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 implementation of Point-to-Point Tunneling Protocol (PPTP) functionality due to insufficient validation of Generic Routing Encapsulation (GRE) frames that pass through the data plane of an affected access point. A remote attacker can initiate a PPTP connection to an affected access point from a device that is registered to the same wireless network as the access point and sending a malicious GRE frame through the data plane of the access point and cause the service to crash.

Mitigation
Update to versions 8.7(102.0), 8.7(1.24), 8.6(101.0), 8.6(1.108), 8.5(110.0), 8.5(107.37) or 8.5(103.9).

Vulnerable software versions

Cisco Aironet 1850 Series Access Points: 8.4.100.0 - 8.5.103.0

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180502-ap-ptp

---

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?

No. We are not aware of malware exploiting this vulnerability.