Challenge Description
My friend found this strange file while perusing his computer, but we can’t read it. Can you figure out what it is and get the information from it?
Difficulty: Easy/Medium
The flag is in the standard format.
Solution
Extract the content from the zip file
It’s a LevelDB backup? Dump all the information using LevelDBDumper
LevelDBDumper -d challenge -o dumped [{""payload"":""eyJrZXkiOiJcIjMzNTc5M2Q1LTRhYzEtNDgyMy05MmM3LWZkM2I1YTZhMmEwN1wiIiwib3AiOiJQVVQiLCJ2YWx1ZSI6ImV5SmtZWFJoSWpwYkluTjNZVzF3UTFSR2V6RndaalV0WWpRMU0yUXRaRFEzTkdJME5UTjlJbDBzSW1sa0lqb2lYQ0l6TXpVM09UTmtOUzAwWVdNeExUUTRNak10T1RKak55MW1aRE5pTldFMllUSmhNRGRjSWlKOSJ9"",""id"":""/orbitdb/bafyreiejrtaennxufa3wvkdvyoj6ywq6nid3lukdqcnx2fc33tckzjzbke/ctf"",""next"":[{""/"":""bafyreibbadm2ajrr6io6ufqidibrpdjfpdyfobp2aqvmcprqu5yrk7mq6q""}],""refs"":[{""/"":""bafyreiesvykh6wt7hn4fry4mphv6ckxr5wq3c2fecvcjbqs4scbkizc6jm""},{""/"":""bafyreihq7osywkglsjxn5lmbegtc7izqmb66atx5trkrpcmlvtcyrr6nuy""},{""/"":""bafyreiab6do7qxgjipiypoj754vicpuscejf43eguvo2ykb2igoyrtkl64""}],""v"":2,""key"":""BJx/DXfZOVG6YkoHDGQvNQVMBaoeaEdEvcKFJP0PM1m3h9/o8lJgnTQkqGCAKovuOCovsDHQ5JOVs7qpJm3V8Ks="",""sig"":""MEQCIF5FwOBiQKgEI7njg6He6iAlwNc+Gj8+PAll5o1PCGhKAiBlnXg9+hinX6AGB2r0uXoJ3q9Tbe6azh9euPx40G8uqw=="",""identity"":{""id"":""02020192715ea41d7eaaceb4bd19516d0d4f1e8a2e81903480083dbdbe99dfefc9"",""publicKey"":""BJx/DXfZOVG6YkoHDGQvNQVMBaoeaEdEvcKFJP0PM1m3h9/o8lJgnTQkqGCAKovuOCovsDHQ5JOVs7qpJm3V8Ks="",""signatures"":{""id"":""MEQCIGx+GRqmTfPqcUL28aG2p1Q2TNEfZ9QlCgB8WU4my68UAiBZClP9WMe385COJ0WuNnXRj7BIolRC2v6vhLqUt3Yk/w=="",""publicKey"":""MEQCIFC+7AikjMLabNvdHiHh7rwrFTbystu6xc2r1h/1Zr4jAiBFxjxIMNjfI5J996HDYEQd+fnaKDi5GlNw5hgl+RwEOg==""},""type"":""orbitdb"",""Provider"":null},""hash"":{""/"":""bafyreihq6d33ifjj6jbmjptygyksgwzcrjm5kxarbbp6djbzqx2exij27u""},""clock"":{""id"":""BJx/DXfZOVG6YkoHDGQvNQVMBaoeaEdEvcKFJP0PM1m3h9/o8lJgnTQkqGCAKovuOCovsDHQ5JOVs7qpJm3V8Ks="",""time"":7}}]decode base64 values to reveal the flag
❯ echo 'eyJrZXkiOiJcIjMzNTc5M2Q1LTRhYzEtNDgyMy05MmM3LWZkM2I1YTZhMmEwN1wiIiwib3AiOiJQVVQiLCJ2YWx1ZSI6ImV5SmtZWFJoSWpwYkluTjNZVzF3UTFSR2V6RndaalV0WWpRMU0yUXRaRFEzTkdJME5UTjlJbDBzSW1sa0lqb2lYQ0l6TXpVM09UTmtOUzAwWVdNeExUUTRNak10T1RKak55MW1aRE5pTldFMllUSmhNRGRjSWlKOSJ9' | base64 -d
{"key":"\"335793d5-4ac1-4823-92c7-fd3b5a6a2a07\"","op":"PUT","value":"eyJkYXRhIjpbInN3YW1wQ1RGezFwZjUtYjQ1M2QtZDQ3NGI0NTN9Il0sImlkIjoiXCIzMzU3OTNkNS00YWMxLTQ4MjMtOTJjNy1mZDNiNWE2YTJhMDdcIiJ9"}%
~/ctf/swampctf/dumped
❯ echo 'eyJkYXRhIjpbInN3YW1wQ1RGezFwZjUtYjQ1M2QtZDQ3NGI0NTN9Il0sImlkIjoiXCIzMzU3OTNkNS00YWMxLTQ4MjMtOTJjNy1mZDNiNWE2YTJhMDdcIiJ9' | base64 -d
{"data":["swampCTF{1pf5-b453d-d474b453}"],"id":"\"335793d5-4ac1-4823-92c7-fd3b5a6a2a07\""}References / Related
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