Arbitrary code execution in Cisco CVR100W Wireless-N VPN Router

1) Buffer overflow

EUVDB-ID: #VU6425

Risk: Medium

CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-3882

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows an unauthenticated, Layer 2–adjacent attacker to cause DoS condition or execute arbitrary code on the target system.

The weakness exists due to buffer overflow caused by incomplete range checks of the UPnP input data. An attacker can send a malicious request to the UPnP listening port, trigger memory corruption, cause the device to reload or potentially execute arbitrary code with root privileges.

Successful exploitation of the vulnerability may result in denial of service or arbitrary code execution.

Mitigation

Update to version 1.0.1.22.

Vulnerable software versions

CVR100W Wireless-N VPN Router: 1.0.1.21

CPE2.3

• cpe:2.3:h:cisco_systems:cvr100w_wireless-n_vpn_router:1.0.1.21:*:*:*:*:*:*:*

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170503-cvr100w1

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).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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