HTB Business CTF2024 Writeup(Cloud Protrude)
はじめに
HTB Business CTF 2024にTeam NEC Corporationとして参加してました。順位は70位、私はCloudのScurried, Protrude, MetaRootedとForensicのCaving、CryptoのeXciting Outpost Recon、RevのFlagCasinoを解きました。ほぼVeryeasy....
Writeupは公式のGithubがありますが、私の記憶が間違いでなければCloud Protrudeの問題のFlagが違うのではと思ったので記録として残しておこうと思います。
GitHub - hackthebox/business-ctf-2024: Official writeups for Business CTF 2024: The Vault Of Hope
Cloud Protrude
問題としてはAWSのアクセスキーが与えられるのでそれをもとにflagを見つけます。
Access key ID,Secret access key, region name AKIAXYAFLIG2JE6MC2SY,teWVv0GzIBKS23uozxUGmUH+muE5XB86fnZmRZXu, us-east-1
まずはaws configureコマンドでアクセスキーを設定します。そのあとHacktricksの内容を見つつEnumerationするとaws ds describe-directoriesコマンドで情報が入手できます。
└─$ aws ds describe-directories
{
"DirectoryDescriptions": [
{
"DirectoryId": "d-9067e0513b",
"Name": "vault101.wasteland.local",
"ShortName": "VAULT101",
"Size": "Small",
"Alias": "vault101",
"AccessUrl": "vault101.awsapps.com",
"DnsIpAddrs": [
"172.31.87.164",
"172.31.31.15"
],
"Stage": "Active",
"LaunchTime": "2024-04-28T17:47:14.630000-04:00",
"StageLastUpdatedDateTime": "2024-04-28T17:54:13.623000-04:00",
"Type": "SimpleAD",
"VpcSettings": {
"VpcId": "vpc-0d7b2c5c8509574bd",
"SubnetIds": [
"subnet-0a5022ff1dfdf5518",
"subnet-0574f58cd2d4f85ca"
],
"SecurityGroupId": "sg-0bee7f241cef79345",
"AvailabilityZones": [
"us-east-1a",
"us-east-1d"
]
},
"SsoEnabled": true,
"DesiredNumberOfDomainControllers": 0
}
]
}
AWS - Directory Services / WorkDocs Enum | HackTricks Cloud | HackTricks Cloud
WorkdocsのURLがvault101.awsapps.comであることがわかります。そのままHackTricksに書いてあるようにdescribe-activitiesで内容を確認していきます。
$ aws workdocs describe-activities --organization-id d-9067e0513b
{
"UserActivities": [
{
"Type": "DOCUMENT_VERSION_VIEWED",
"TimeStamp": "2024-05-18T12:36:36.297000-04:00",
"IsIndirectActivity": false,
"Initiator": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
},
"ResourceMetadata": {
"Type": "document",
"Name": "flag.txt",
"Id": "5347a27512a4f5a1c0ed4b7e965210deecbb6b806a23034ce799614ca32a8303",
"Owner": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
}
}
},
{
"Type": "DOCUMENT_VERSION_UPLOADED",
"TimeStamp": "2024-05-18T12:15:38.010000-04:00",
"IsIndirectActivity": false,
"Initiator": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
},
"ResourceMetadata": {
"Type": "document",
"Name": "flag.txt",
"Id": "5347a27512a4f5a1c0ed4b7e965210deecbb6b806a23034ce799614ca32a8303",
"Owner": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
}
}
},
{
"Type": "DOCUMENT_RECYCLED",
"TimeStamp": "2024-05-18T12:15:25.001000-04:00",
"IsIndirectActivity": false,
"Initiator": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
},
"ResourceMetadata": {
"Type": "document",
"Name": "flag.txt",
"OriginalName": "flag.txt",
"Id": "77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3",
"Owner": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
}
}
},
{
"Type": "DOCUMENT_VERSION_VIEWED",
"TimeStamp": "2024-05-02T15:19:09.840000-04:00",
"IsIndirectActivity": false,
"Initiator": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
},
"ResourceMetadata": {
"Type": "document",
"Name": "flag.txt",
"Id": "77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3",
"Owner": {
"Id": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b"
}
}
}
(snip)
flag.txtが存在しており、この問題のflagっぽいことがわかります。
aws workdocs get-document --document-id <doc-id>でファイルを入手できます。
$ aws workdocs get-document --document-id 77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3
{
{
"Metadata": {
"Id": "77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3",
"CreatorId": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b",
"ParentFolderId": "94e9703302611d8aa338d1c30999705e8049ee1582a1c5786b0a7eda3c16ea3c",
"CreatedTimestamp": "2024-04-28T18:24:09.164000-04:00",
"ModifiedTimestamp": "2024-05-18T12:15:25.001000-04:00",
"LatestVersionMetadata": {
"Id": "1714343049164-81272441b82c9b001b5dc02d4cc08291587c9fc374f03ac27a71773271311aea",
"Name": "flag.txt",
"ContentType": "text/plain",
"Size": 34,
"Signature": "d2e51309fefb4b367def2c26cb725048",
"Status": "ACTIVE",
"CreatedTimestamp": "2024-04-28T18:24:09.164000-04:00",
"ModifiedTimestamp": "2024-04-28T18:24:09.164000-04:00",
"CreatorId": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b",
"Thumbnail": {
"LARGE": "https://gb-prod-doc-source.s3.amazonaws.com/77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3/1714343049164-81272441b82c9b001b5dc02d4cc08291587c9fc374f03ac27a71773271311aea/PDF_LARGE?response-content-disposition=attachment%3B%20filename%2A%3DUTF-8%27%27LARGE&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEJn%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJIMEYCIQCUMeJacU%2FMa3ONPQr5cGHSxYgfisdbTCfvqdCSFIQTjQIhAMDGtj2wNRhSKF2bynLMO8r5qEd0CtRMYePa42r0GGw1KtUDCBIQABoMOTczMTg3NTUzMDI3Igx%2BNLBqvBicttm1%2F%2BIqsgPRPBl8WHj07L8cwomPgFSvwKvkMKkkGRoEvDLEf%2FOCYfVOAehgUUZXXq%2BgXeOrGS%2F%2Fi64iErJ5eyovacvq%2B%2B7xEef6%2FixOcXfhQGmCt1GnjuhKJPCKmKFu5JVias6RSgMO2ANUh08IQS9J67aZT0BcOID5wDy%2B9i09TQBVleRxvKZ%2BZ4ihsNIgGvvhBA33RsJfBlj5Ary3SuE%2Fhf2k8YzZuRcW9qVg27yrUCcWoKCJGFpU5oOqH0rzFYiqBfXPZwla3ZIL4Fi%2BVNn62uUGxRkDMZPkpx%2BRN14Rpdv8i2ttnIgZSEMDnOTYtl5sgRR8r7eViHVdzoTXoyccZxsnzrKC%2FFQRNQwvFwwHqOShTk8EZlMh1HOw7LHXz0Opua4kCaEZBAeICDDE1YzOApR2UWFbLJ6JtMPdWoFSo8oh4khOe4BqdMpq87%2FvSsGpxaefo%2BDcXi190bMnDx%2FvZo5hfuCxw%2B356PWCY16rd6tlAzKmAayTIXTPMT9GCkQtqM49SzBmj2aZcx6rn4T%2FHhu9BxUv%2BjMJWScRo4UstxbKslrSaT%2FUhIv899BnT486eRAi6uMgZzDz86ayBjqgAaSVq821v2pVjoIIWxyNJWlSl8odH1y8z9si0OvYdPi1c5Q6nexvFwiYFb13t23virhMO7tHdsNjzE2cxnQOj8Kf3f91q2l8a6Ijb%2Bj0hDspn8kSf3Q%2FdPsAyC9rn%2B7MVgKPfWntfjkvBNzN5O0vCf%2FYZsh53%2BM6sXXoeGbKxTCjozrEXmLmjbPQ75KJ1EHQ7Z9FHjCPD0BMXaqaLa3D%2Ftw%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20240519T085302Z&X-Amz-SignedHeaders=host&X-Amz-Expires=900&X-Amz-Credential=ASIA6FFT7S4B5POFWAUR%2F20240519%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=d92447283e3aee5c8369f8f4929b19385866dc85fce465b61903a876c5dc4ab1",
"SMALL": "https://gb-prod-doc-source.s3.amazonaws.com/77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3/1714343049164-81272441b82c9b001b5dc02d4cc08291587c9fc374f03ac27a71773271311aea/PDF_SMALL?response-content-disposition=attachment%3B%20filename%2A%3DUTF-8%27%27SMALL&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEJn%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJIMEYCIQCUMeJacU%2FMa3ONPQr5cGHSxYgfisdbTCfvqdCSFIQTjQIhAMDGtj2wNRhSKF2bynLMO8r5qEd0CtRMYePa42r0GGw1KtUDCBIQABoMOTczMTg3NTUzMDI3Igx%2BNLBqvBicttm1%2F%2BIqsgPRPBl8WHj07L8cwomPgFSvwKvkMKkkGRoEvDLEf%2FOCYfVOAehgUUZXXq%2BgXeOrGS%2F%2Fi64iErJ5eyovacvq%2B%2B7xEef6%2FixOcXfhQGmCt1GnjuhKJPCKmKFu5JVias6RSgMO2ANUh08IQS9J67aZT0BcOID5wDy%2B9i09TQBVleRxvKZ%2BZ4ihsNIgGvvhBA33RsJfBlj5Ary3SuE%2Fhf2k8YzZuRcW9qVg27yrUCcWoKCJGFpU5oOqH0rzFYiqBfXPZwla3ZIL4Fi%2BVNn62uUGxRkDMZPkpx%2BRN14Rpdv8i2ttnIgZSEMDnOTYtl5sgRR8r7eViHVdzoTXoyccZxsnzrKC%2FFQRNQwvFwwHqOShTk8EZlMh1HOw7LHXz0Opua4kCaEZBAeICDDE1YzOApR2UWFbLJ6JtMPdWoFSo8oh4khOe4BqdMpq87%2FvSsGpxaefo%2BDcXi190bMnDx%2FvZo5hfuCxw%2B356PWCY16rd6tlAzKmAayTIXTPMT9GCkQtqM49SzBmj2aZcx6rn4T%2FHhu9BxUv%2BjMJWScRo4UstxbKslrSaT%2FUhIv899BnT486eRAi6uMgZzDz86ayBjqgAaSVq821v2pVjoIIWxyNJWlSl8odH1y8z9si0OvYdPi1c5Q6nexvFwiYFb13t23virhMO7tHdsNjzE2cxnQOj8Kf3f91q2l8a6Ijb%2Bj0hDspn8kSf3Q%2FdPsAyC9rn%2B7MVgKPfWntfjkvBNzN5O0vCf%2FYZsh53%2BM6sXXoeGbKxTCjozrEXmLmjbPQ75KJ1EHQ7Z9FHjCPD0BMXaqaLa3D%2Ftw%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20240519T085302Z&X-Amz-SignedHeaders=host&X-Amz-Expires=900&X-Amz-Credential=ASIA6FFT7S4B5POFWAUR%2F20240519%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=b3f7ebd3d65ad8fe74eec494bf5220e57715ba25aa27142d3e93f2d2ac255c79",
"SMALL_HQ": "https://gb-prod-doc-source.s3.amazonaws.com/77c4bd695e891b73b67f8c6c11df9baa76b47a2f0fe837ef201f34f5de0fb3e3/1714343049164-81272441b82c9b001b5dc02d4cc08291587c9fc374f03ac27a71773271311aea/PDF_SMALL_HQ?response-content-disposition=attachment%3B%20filename%2A%3DUTF-8%27%27SMALL_HQ&X-Amz-Security-Token=IQoJb3JpZ2luX2VjEJn%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCXVzLWVhc3QtMSJIMEYCIQCUMeJacU%2FMa3ONPQr5cGHSxYgfisdbTCfvqdCSFIQTjQIhAMDGtj2wNRhSKF2bynLMO8r5qEd0CtRMYePa42r0GGw1KtUDCBIQABoMOTczMTg3NTUzMDI3Igx%2BNLBqvBicttm1%2F%2BIqsgPRPBl8WHj07L8cwomPgFSvwKvkMKkkGRoEvDLEf%2FOCYfVOAehgUUZXXq%2BgXeOrGS%2F%2Fi64iErJ5eyovacvq%2B%2B7xEef6%2FixOcXfhQGmCt1GnjuhKJPCKmKFu5JVias6RSgMO2ANUh08IQS9J67aZT0BcOID5wDy%2B9i09TQBVleRxvKZ%2BZ4ihsNIgGvvhBA33RsJfBlj5Ary3SuE%2Fhf2k8YzZuRcW9qVg27yrUCcWoKCJGFpU5oOqH0rzFYiqBfXPZwla3ZIL4Fi%2BVNn62uUGxRkDMZPkpx%2BRN14Rpdv8i2ttnIgZSEMDnOTYtl5sgRR8r7eViHVdzoTXoyccZxsnzrKC%2FFQRNQwvFwwHqOShTk8EZlMh1HOw7LHXz0Opua4kCaEZBAeICDDE1YzOApR2UWFbLJ6JtMPdWoFSo8oh4khOe4BqdMpq87%2FvSsGpxaefo%2BDcXi190bMnDx%2FvZo5hfuCxw%2B356PWCY16rd6tlAzKmAayTIXTPMT9GCkQtqM49SzBmj2aZcx6rn4T%2FHhu9BxUv%2BjMJWScRo4UstxbKslrSaT%2FUhIv899BnT486eRAi6uMgZzDz86ayBjqgAaSVq821v2pVjoIIWxyNJWlSl8odH1y8z9si0OvYdPi1c5Q6nexvFwiYFb13t23virhMO7tHdsNjzE2cxnQOj8Kf3f91q2l8a6Ijb%2Bj0hDspn8kSf3Q%2FdPsAyC9rn%2B7MVgKPfWntfjkvBNzN5O0vCf%2FYZsh53%2BM6sXXoeGbKxTCjozrEXmLmjbPQ75KJ1EHQ7Z9FHjCPD0BMXaqaLa3D%2Ftw%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20240519T085302Z&X-Amz-SignedHeaders=host&X-Amz-Expires=900&X-Amz-Credential=ASIA6FFT7S4B5POFWAUR%2F20240519%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=548fc0d1b43fd5137a5c59e28b91fe81edd0c04f410e3063d1be0011c2514923"
}
},
"ResourceState": "RECYCLED"
}
}
URLが入手できるので、wgetしてファイルを開いてみると次の画像が入手できました。
LEETっぽいのでlかIかわからないなと思いつつ、入力しましたが正解になりませんでした。
HTB{v4Ul7l0i_i5_L0vely_l5n'7_l7?}
HTB{v4UI7l0i_i5_L0vely_I5n'7_I7?}
HTB{v4Ul7I0i_i5_L0vely_I5n'7_I7?}
HTB{v4Ul7I0i_i5_L0vely_I5n'7_I7?} ★これが公式のWriteupでも正解となってたもの
改めてdescribe-activitiesの結果を眺めていると、flag.txtではあるもののdoc-idが異なるものがあることに気づきました。
$ aws workdocs get-document --document-id 5347a27512a4f5a1c0ed4b7e965210deecbb6b806a23034ce799614ca32a8303
{
"Metadata": {
"Id": "5347a27512a4f5a1c0ed4b7e965210deecbb6b806a23034ce799614ca32a8303",
"CreatorId": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b",
"ParentFolderId": "a640c404de3b5999c1d06cdf4eb6b7a29de60b26d1611cc8bc3757447dc49555",
"CreatedTimestamp": "2024-05-18T12:15:36.962000-04:00",
"ModifiedTimestamp": "2024-05-18T12:15:44.393000-04:00",
"LatestVersionMetadata": {
"Id": "1716048936962-62cd64e3c78ceac9b28d07615056620eb3c41ba49156b8f5979eac81eaa1f720",
"Name": "flag.txt",
"ContentType": "text/plain",
"Size": 40,
"Signature": "3a1339875f0d0486886f1f4da81171a0",
"Status": "ACTIVE",
"CreatedTimestamp": "2024-05-18T12:15:36.962000-04:00",
"ModifiedTimestamp": "2024-05-18T12:15:36.962000-04:00",
"CreatorId": "S-1-5-21-1692074632-1250882497-497425265-500&d-9067e0513b",
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},
"ResourceState": "ACTIVE"
}
一番下のResourceStateがACTIVEになっていました。
HTB{AWS_WORKDOCS_CAN_HAVE_USEFUL_STUFF}を送信したら正解した（記憶がある、あやふやなのでもしかしたらその前に送信していたやつで正解していた可能性もあるが）
おわり
別解ではないが、なんか違う感じだったので記録として残します。CTF自体はとても楽しかったですが、もっと取り組んでいかないと解けないよなという思いもありました。
