### Summary
An exploitable null pointer dereference exists in the Web Application functionality of Moxa AWK-3131A Wireless Access Point running firmware 1.1. Any HTTP GET request not preceded by an '/' will cause a segmentation fault in the web server. An attacker can send any of a multitude of potentially unexpected HTTP get requests to trigger this vulnerability.
### Tested Versions
Moxa AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client 1.1
### Product URLs
http://www.moxa.com/product/AWK-3131A.htm
### CVSSv3 Score
7.5 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
### Details
An exploitable null pointer dereference exists in the Web Application functionality of Moxa AWK-3131A Series Industrial IEEE 802.11a/b/g/n wireless AP/bridge/client. Any HTTP GET request not preceded by an '/' will cause a segmentation fault in the web server. An attacker can send any of a multitude of potentially unexpected HTTP GET requests to trigger this vulnerability.
There is no way to restart the web application using legitimate functionality outside of rebooting the device.
### Exploit Proof-of-Concept
The following is one of many HTTP GET requests which will result in a web server segmentation fault:
```
GET a HTTP/1.1
```
### Mitigation
To significantly mitigate risk of exploitation, disable the web application before the device is deployed.
### Timeline
* 2016-11-18 - Vendor Disclosure
* 2017-04-10 - Public Release
### CREDIT
* Discovered by Patrick DeSantis of Cisco Talos.
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