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      "title": "Nebula level03 solution",
      "body": "<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://1.bp.blogspot.com/-YWzqhaXTth4/WAuZ9Zei2wI/AAAAAAAAAN4/UtIWZGRBNxkLPlEzb7sA9fGF5aFQMevyQCLcB/s1600/Nebula_level03_1.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://1.bp.blogspot.com/-YWzqhaXTth4/WAuZ9Zei2wI/AAAAAAAAAN4/UtIWZGRBNxkLPlEzb7sA9fGF5aFQMevyQCLcB/s1600/Nebula_level03_1.jpg\" /></a></div>\n<br />\n<div style=\"text-align: justify;\">\nFirst, go to the flag03 directory and check the files there.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<br />\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://1.bp.blogspot.com/-ExUV4GvbDMw/WAuZ9KxjmrI/AAAAAAAAAN0/SuDrx0oE8ognYmQha5XU4KiV3OB2gM4TgCLcB/s1600/Nebula_level03_2.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://1.bp.blogspot.com/-ExUV4GvbDMw/WAuZ9KxjmrI/AAAAAAAAAN0/SuDrx0oE8ognYmQha5XU4KiV3OB2gM4TgCLcB/s1600/Nebula_level03_2.jpg\" /></a></div>\n<br />\n<div style=\"text-align: justify;\">\nthere is a shell script file and a directory. There is also something suspicious shell script file, let's open it.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\nThe script means that The writable.sh executes all script files in the writable.d directory with Bash shell and removes it after 5 seconds. The script seems to be repeatedly executed.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\nLet's induce crontab to create an executable file with SetUID authority. This file will execute Bash shell.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\nWe need a binary executable file because SetUID authority does not operate in a shell script</div>\n<div>\n<br /></div>\n<br />\n<br />\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://2.bp.blogspot.com/-mOC_egZi5IM/WAuZ9Kkt5YI/AAAAAAAAANw/uWDgBqy_pPwZm2yctMSc1YEcudhfeXepwCLcB/s1600/Nebula_level03_3.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://2.bp.blogspot.com/-mOC_egZi5IM/WAuZ9Kkt5YI/AAAAAAAAANw/uWDgBqy_pPwZm2yctMSc1YEcudhfeXepwCLcB/s1600/Nebula_level03_3.jpg\" /></a></div>\n<br />\nAsh(Attack shell) Induces that crontab compiles the source code and configures SetUID authority.<br />\n<br />\nAnd create a Asw (Attack software) to be compiled as below<br />\n<div>\n<br /></div>\n<div>\n<br /></div>\n<br />\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://4.bp.blogspot.com/-4U1cts3zrCg/WAuZ9gOwV1I/AAAAAAAAAN8/GT93_NsVSSEbAogHnIQTSjmQT866Miz9gCLcB/s1600/Nebula_level03_4.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://4.bp.blogspot.com/-4U1cts3zrCg/WAuZ9gOwV1I/AAAAAAAAAN8/GT93_NsVSSEbAogHnIQTSjmQT866Miz9gCLcB/s1600/Nebula_level03_4.jpg\" /></a></div>\n<br />\n<div style=\"text-align: justify;\">\nConfigure realUID, effective UID, saved set-user-ID as flag03's UID. This function only operate if special authority SetUID is configured.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\nI was just curious so I inserted the whoami command for checking effective UID.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\nFinally, It attemps to change the authority with running the /bin/bash.</div>\n<div>\n<br /></div>\n<div>\n<br /></div>\n<br />\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://4.bp.blogspot.com/-9bq7JSON1nw/WAuZ9s3Kr6I/AAAAAAAAAOA/XxJhf_zZ2yoS_XR-wPcb__UPwBDeqRNcQCLcB/s1600/Nebula_level03_5.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://4.bp.blogspot.com/-9bq7JSON1nw/WAuZ9s3Kr6I/AAAAAAAAAOA/XxJhf_zZ2yoS_XR-wPcb__UPwBDeqRNcQCLcB/s1600/Nebula_level03_5.jpg\" /></a></div>\n<br />\n<div style=\"text-align: justify;\">\nPut the created shell script in the writable.d directory.</div>\n<div style=\"text-align: justify;\">\n<br /></div>\n<div style=\"text-align: justify;\">\nA few minutes later, we can see that the missing Ash file.</div>\n<br />\n<br />\n<br />\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://1.bp.blogspot.com/-WfbRg_paKV0/WAuZ95pgafI/AAAAAAAAAOE/JQfzCTNbPM0cavE8r7CRF0kK-2ZSa7NQwCLcB/s1600/Nebula_level03_6.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://1.bp.blogspot.com/-WfbRg_paKV0/WAuZ95pgafI/AAAAAAAAAOE/JQfzCTNbPM0cavE8r7CRF0kK-2ZSa7NQwCLcB/s1600/Nebula_level03_6.jpg\" /></a></div>\n<br />\n<div style=\"text-align: justify;\">\nAnd Asw file is created. flag03 is owner, It is configured SetUID authority.&nbsp;</div>\n<br />\n<br />\n<br />\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"https://1.bp.blogspot.com/-_HdnPNwqgJg/WAuZ-MRQlCI/AAAAAAAAAOI/Z_3WiAnYXSQIiTaE902Zi540kJwqNMzkgCLcB/s1600/Nebula_level03_7.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"https://1.bp.blogspot.com/-_HdnPNwqgJg/WAuZ-MRQlCI/AAAAAAAAAOI/Z_3WiAnYXSQIiTaE902Zi540kJwqNMzkgCLcB/s1600/Nebula_level03_7.jpg\" /></a></div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\">\n<br /></div>\n<div class=\"separator\" style=\"clear: both; text-align: justify;\">\nIf Asw file is executed, we can know that the shell of the flag03's authorization is executed.</div>\n<div class=\"separator\" style=\"clear: both; text-align: justify;\">\n<br /></div>\n<div class=\"separator\" style=\"clear: both; text-align: justify;\">\nClear level03 with getflag command.</div>\n<br />\n\nIt is also posted at : http://cysecguide.blogspot.com/2016/10/nebula-level03-solution.html",
      "json_metadata": "{\"tags\":[\"security\",\"nebula\",\"wargame\"],\"image\":[\"https://1.bp.blogspot.com/-YWzqhaXTth4/WAuZ9Zei2wI/AAAAAAAAAN4/UtIWZGRBNxkLPlEzb7sA9fGF5aFQMevyQCLcB/s1600/Nebula_level03_1.jpg\",\"https://1.bp.blogspot.com/-ExUV4GvbDMw/WAuZ9KxjmrI/AAAAAAAAAN0/SuDrx0oE8ognYmQha5XU4KiV3OB2gM4TgCLcB/s1600/Nebula_level03_2.jpg\",\"https://2.bp.blogspot.com/-mOC_egZi5IM/WAuZ9Kkt5YI/AAAAAAAAANw/uWDgBqy_pPwZm2yctMSc1YEcudhfeXepwCLcB/s1600/Nebula_level03_3.jpg\",\"https://4.bp.blogspot.com/-4U1cts3zrCg/WAuZ9gOwV1I/AAAAAAAAAN8/GT93_NsVSSEbAogHnIQTSjmQT866Miz9gCLcB/s1600/Nebula_level03_4.jpg\",\"https://4.bp.blogspot.com/-9bq7JSON1nw/WAuZ9s3Kr6I/AAAAAAAAAOA/XxJhf_zZ2yoS_XR-wPcb__UPwBDeqRNcQCLcB/s1600/Nebula_level03_5.jpg\",\"https://1.bp.blogspot.com/-WfbRg_paKV0/WAuZ95pgafI/AAAAAAAAAOE/JQfzCTNbPM0cavE8r7CRF0kK-2ZSa7NQwCLcB/s1600/Nebula_level03_6.jpg\",\"https://1.bp.blogspot.com/-_HdnPNwqgJg/WAuZ-MRQlCI/AAAAAAAAAOI/Z_3WiAnYXSQIiTaE902Zi540kJwqNMzkgCLcB/s1600/Nebula_level03_7.jpg\"],\"links\":[\"https://1.bp.blogspot.com/-YWzqhaXTth4/WAuZ9Zei2wI/AAAAAAAAAN4/UtIWZGRBNxkLPlEzb7sA9fGF5aFQMevyQCLcB/s1600/Nebula_level03_1.jpg\",\"https://1.bp.blogspot.com/-ExUV4GvbDMw/WAuZ9KxjmrI/AAAAAAAAAN0/SuDrx0oE8ognYmQha5XU4KiV3OB2gM4TgCLcB/s1600/Nebula_level03_2.jpg\",\"https://2.bp.blogspot.com/-mOC_egZi5IM/WAuZ9Kkt5YI/AAAAAAAAANw/uWDgBqy_pPwZm2yctMSc1YEcudhfeXepwCLcB/s1600/Nebula_level03_3.jpg\",\"https://4.bp.blogspot.com/-4U1cts3zrCg/WAuZ9gOwV1I/AAAAAAAAAN8/GT93_NsVSSEbAogHnIQTSjmQT866Miz9gCLcB/s1600/Nebula_level03_4.jpg\",\"https://4.bp.blogspot.com/-9bq7JSON1nw/WAuZ9s3Kr6I/AAAAAAAAAOA/XxJhf_zZ2yoS_XR-wPcb__UPwBDeqRNcQCLcB/s1600/Nebula_level03_5.jpg\",\"https://1.bp.blogspot.com/-WfbRg_paKV0/WAuZ95pgafI/AAAAAAAAAOE/JQfzCTNbPM0cavE8r7CRF0kK-2ZSa7NQwCLcB/s1600/Nebula_level03_6.jpg\",\"https://1.bp.blogspot.com/-_HdnPNwqgJg/WAuZ-MRQlCI/AAAAAAAAAOI/Z_3WiAnYXSQIiTaE902Zi540kJwqNMzkgCLcB/s1600/Nebula_level03_7.jpg\",\"http://cysecguide.blogspot.com/2016/10/nebula-level03-solution.html\"]}"
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      "body": "Fair enough, no offence meant - I mean \"spam\" in the sense that its not something I can use or vote on since its not original content, so I just need to filter it out of my feed in that case..\n\nIf you really just refuse to write original content and just want to plug your blog instead, at least give it a short blurb so it makes sense ? \n\nEG: This post is apparently a hint for \"nebula level03\" -  perhaps some sort of clue wtf \"nebula\" is or a link would be good...",
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