330 lines
9.9 KiB
Markdown
330 lines
9.9 KiB
Markdown
# LG webOS
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- [TV](#TV)
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- [digging](#digging)
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- [nmap](#nmap)
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- [sniffing](#sniffing)
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- [on boot](#on-boot)
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- [channel search](#channel-search)
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- [application marketplace](#application-marketplace)
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- [impersonating](#impersonating)
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- [OS update](#os-update)
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- [channel guide](#channel-guide)
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- [application update](#application-update)
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## TV
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name|value
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----|-----
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model|43UH6100
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product|`3.0`
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firmware|`4.30.40`
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features|app marketplace, live TV listings
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vulnerabilities|all phone-home calls are done over `HTTP`
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the `43UH6100` is a 'smart' TV, running LG's [webOS](https://en.wikipedia.org/wiki/WebOS)
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since it is a fair assumption it is running [OpenWrt](https://en.wikipedia.org/wiki/OpenWrt) underneath, the original goal
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was rooting the device, but initial investigations showed some other interesting vectors
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## digging
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### nmap
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from `nmap -PN -sV <device>`, we get:
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```
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PORT STATE SERVICE VERSION
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1175/tcp open upnp
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3000/tcp open http LG smart TV http service
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3001/tcp open ssl/http LG smart TV http service
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9998/tcp open http Google Chromecast httpd
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```
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aside from the obvious flag running of both HTTP and HTTPS versions of (likely) the same service,
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interested to see that the Chromecast plugged in to the TV is also being exposed on the same IP as the TV
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since there is an [LG smart TV](http://www.lg.com/us/experience-tvs/smart-tv) app available for [Android](https://play.google.com/store/apps/details?id=com.lge.tv.remoteapps&hl=en)/[iOS](https://itunes.apple.com/us/app/lg-tv-remote/id509979485), assuming that there is an API of some sort running on `3000` or `3001`, so:
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```
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$ curl http://<device>:3000
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Hello world
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```
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we see the same response on `3001`, but have to use `-k` as the device uses a self-signed certificate
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so, something is there, we just don't know how to talk to it yet
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### sniffing
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switching tactics and connected the TV to a wireless network that has a tap, and we start to see some interesting things:
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#### on boot
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every time the TV starts up, within 30 seconds, it calls home:
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```
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POST /CheckSWAutoUpdate.laf HTTP/1.1
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Accept: */*
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User-Agent: User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
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Host: snu.lge.com:80
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Connection: Keep-Alive
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Content-type: application/x-www-form-urlencoded
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Content-Length: 572
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```
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```
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HTTP/1.1 200 OK
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Date: Wed, 16 Nov 2016 08:23:56 GMT
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Content-length: 508
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Content-type: application/octet-stream;charset=UTF-8
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Pragma: no-cache;
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Expires: -1;
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Content-Transfer-Encoding: binary;
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```
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that looks a lot like base64 encoded data, and when decoded, yields
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request:
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```xml
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<REQUEST>
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<PRODUCT_NM>webOSTV 3.0</PRODUCT_NM>
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<MODEL_NM>HE_DTV_W16P_AFADATAA</MODEL_NM>
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<SW_TYPE>FIRMWARE</SW_TYPE>
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<MAJOR_VER>04</MAJOR_VER>
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<MINOR_VER>30.40</MINOR_VER>
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<COUNTRY>US2</COUNTRY>
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<COUNTRY_GROUP>US</COUNTRY_GROUP>
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<DEVICE_ID>de:ad:be:ef:ca:fe</DEVICE_ID>
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<AUTH_FLAG>N</AUTH_FLAG>
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<IGNORE_DISABLE>N</IGNORE_DISABLE>
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<ECO_INFO>01</ECO_INFO>
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<CONFIG_KEY>00</CONFIG_KEY>
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<LANGUAGE_CODE>en-US</LANGUAGE_CODE>
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</REQUEST>
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```
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pretty standard, but the `auth_flag`, `ignore_disable` and `config_key` values are potentially interesting
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response:
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```xml
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<RESPONSE>
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<RESULT_CD>900</RESULT_CD>
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<MSG>Success</MSG>
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<REQ_ID>00000000000000000001</REQ_ID>
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<IMAGE_URL></IMAGE_URL>
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<IMAGE_SIZE></IMAGE_SIZE>
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<IMAGE_NAME></IMAGE_NAME>
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<UPDATE_MAJOR_VER></UPDATE_MAJOR_VER>
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<UPDATE_MINOR_VER></UPDATE_MINOR_VER>
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<FORCE_FLAG></FORCE_FLAG>
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<KE></KE>
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<GMT>16 Nov 2016 08:23:56 GMT</GMT>
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<ECO_INFO>01</ECO_INFO>
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<CDN_URL></CDN_URL>
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<CONTENTS></CONTENTS>
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</RESPONSE>
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```
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much more interesting than the request:
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key |assumption
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-------------------|-----------
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`IMAGE_URL` | the URL of a firmware update
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`IMAGE_SIZE` | the size of the firmware update - are they doing this instead of checksum?
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`IMAGE_NAME` | the name of the firmware update - not sure why this is necessary
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`UPDATE_MAJOR_VER` | the major version of the firmware update
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`UPDATE_MINOR_VER` | the minor version of the firmware update
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`FORCE_FLAG` | whether or not to force the update - unclear if true|false or 1|0
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`CDN_URL` | URL that the firmware update is available at
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`CONTENTS` | none
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#### channel search
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when configuring the cable connections, the TV makes a number of calls:
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request:
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```
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GET /fts/gftsDownload.lge?biz_code=IBS&func_code=ONLINE_EPG_FILE&file_path=/ibs/online/epg_file/20161116/f_1479280636996tmsepgcrawler_merged000004417_201611160600_06_20161116070000.zip HTTP/1.1
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Host: aic-ngfts.lge.com
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Accept: */*
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```
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response:
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```
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HTTP/1.1 200 OK
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Server: Apache
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Content-Disposition: attachment; filename="f_1479280636996tmsepgcrawler_merged000004417_201611160600_06_20161116070000.zip"
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Content-Transfer-Encoding: binary;
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Last-Modified: Wed, 16 Nov 2016 07:25:17 GMT
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Content-Length: 135700
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Content-Type: application/octet-stream;charset=UTF-8
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Date: Wed, 16 Nov 2016 08:24:01 GMT
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Connection: keep-alive
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```
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parameters in request:
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parameter |assumption
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------------|-----------
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`biz_code` | none
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`func_code` | none
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`file_path` | none
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looking at the file path, if not in a chroot'd environment, potential for ~LFI - attempts thus far have shown nothing but `404`
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looking at the file itself:
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```
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$ curl -o foo "http://aic-ngfts.lge.com/fts/<path>"
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% Total % Received % Xferd Average Speed Time Time Time Current
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Dload Upload Total Spent Left Speed
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100 132k 100 132k 0 0 230k 0 --:--:-- --:--:-- --:--:-- 230k
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$ file foo
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foo: Zip archive data, at least v2.0 to extract
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$ unzip foo
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Archive: foo
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inflating: schedule.json
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inflating: program.json
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```
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##### `schedule.json`
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sample entry:
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```json
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{
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"dbAction": "I",
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"schdId": "100006/EP010865380045/2016-11-11-10:00",
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"contentId": "EP010865380045",
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"seqNo": "0",
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"chanCode": "100006",
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"strtTime": "2016,11,11,10,00,00",
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"strtTimeLong": 1478858400,
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"endTime": "2016,11,11,12,00,00",
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"endTimeLong": 1478865600,
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"schdSummary": "",
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"timeType": "",
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"schdPgmTtl": "Late Night Gifts",
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"schdSubTtl": "Lisa Rinna",
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"rebrdcstFlag": "Y",
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"capFlag": "",
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"liveFlag": "",
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"dataBrdcstFlag": "",
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"scExplnBrdcstFlag": "",
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"scQualityGbn": "",
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"signBrdcstFlag": "",
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"voiceMultiBrdcstCount": "",
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"threeDFlag": "",
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"schdAdultClassCode": "-1",
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"schdAgeGrdCode": "TVG",
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"pgmGrId": "SH010865380000",
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"genreCode": "61",
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"realEpsdNo": "0"
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}
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```
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##### `program.json`
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```json
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{
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"dbAction": "I",
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"contentId": "EP000000510045",
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"seqNo": "0",
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"pgmGrId": "SH000000510000",
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"connectorId": "1013932",
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"serId": "184628",
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"serNo": "",
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"seasonId": "7895341",
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"seasonNo": "3",
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"pgmType": "Series",
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"realEpsdNo": "1",
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"summary": "Whitley encounters a new Dwayne on the plane ride back to school.",
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"pgmImgUrlName": "http://ngfts.lge.com/fts/gftsDownload.lge?biz_code=IBS&func_code=TMS_PROGRAM_IMG&file_path=/ibs/tms/program_img/p184628_b_v7_ab.jpg",
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"orgGenreType": "",
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"orgGenreCode": "188",
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"oGenreCode": "2",
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"oGenreType": "",
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"subGenreType": "",
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"subGenreCode": "",
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"makeCom": "",
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"makeCntry": "",
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"makeYear": "1989-09-28",
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"usrPplrSt": "",
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"pplrSt": "",
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"audLang": "en",
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"dataLang": "ENG",
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"audQlty": "",
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"genreImgUrl": "http://aic-ngfts.lge.com/fts/gftsDownload.lge?biz_code=IBS&func_code=GENRE_IMG&file_path=/ibs/genre_img_v/2_36_V_Sitcom.png",
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"vodFlag": "N",
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"pgmImgSize": "V480X720",
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"genreImgSize": "V480X704",
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"lgGenreCode2": "36",
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"lgGenreName2": "Sitcom",
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"programLock": "",
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"castingFlag": "Y"
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}
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```
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#### application marketplace
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bar
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# impersonating
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most (all?) of this data is based on `impersonate-lge.rb` interactions
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## OS update
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`impersonate-lge.rb` catches the POST to `/CheckSWAutoUpdate.laf`, changes:
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key | value
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-------------------|-----------------------------
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`image_url` | `http://snu.lge.com/fizbuzz`
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`image_size` | `400`
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`image_name` | `fizzbuzz`
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`update_major_ver` | `04`
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`update_minor_ver` | `30.50`
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`force_flag` | `Y`
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`cdn_url` | `http://snu.lge.com/fizzbuzz`
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`contents` | `''`
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since the `update_minor_ver` specified is greater than the existing value (`30.40`), the TV prompts the user that an upgrade is available.
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the traffic after the user chooses to upgrade:
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```
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```
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## channel guide
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in `_public/aic/_source/slimmed/schedule.json`, changed:
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key | value
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--------------|----
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`schdSummary` | `h4ck the planet`
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`schdPgmTtl` | `h4ck the planet`
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`schdSubTtl` | `h4ck the planet`
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in `_public/aic/_source/slimmed/program.json`, changed:
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key | value
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----------------|----
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`contentId` | `EP022959710001`
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`genreImgUrl` | `http://aic-gfts.lge.com/aic/hacktheplanet.jpg`
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`pgmGrId` | `SH022959710000`
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`pgmImgUrlName` | `http://aic-gfts.lge.com/aic/hacktheplanet.jpg`
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`summary` | `h4ck the planet`
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`contentId` and `pgmGrId` were changed to make them line up with changes made to `schedule.json`
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## application update
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fizzbang |