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CableTap/doc/advisories/bastille-23.upnp-directory-write.txt
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| Bastille Tracking Number 23 | |
| CVE-2017-9480 | |
| Overview | |
| A vulnerability has been discovered that allows an attacker, who has the ability to launch applications on a gateway (Bastille Tracking Number 22), to read arbitrary files. | |
| Affected Platforms | |
| Cisco DPC3939, firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST | |
| Proof-of-Concept | |
| The UPnP services running on the gateway serve XML files from the directory /var/IGD/. An attacker with the ability to launch applications (Bastille Tracking Number 22) can copy files to this directory, and then download them over HTTP. | |
| An attacker who is connected to the Xfinity Home Security Wi-Fi AP, and has copied the persistent configuration data to /var/IGD/<file>, can download this at the following URL: | |
| http://172.16.12.1:49153/<file> | |
| Test Environment | |
| Cisco DPC3939, firmware version dpc3939-P20-18-v303r20421746-170221a-CMCST | |
| Mitigation | |
| Comcast customers can disable UPnP through the web UI on their gateway. | |
| Recommended Remediation | |
| Comcast customers can disable UPnP through the web UI on their gateway. | |
| Credits | |
| Marc Newlin and Logan Lamb, Bastille | |
| Chris Grayson, Web Sight.IO |