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Fix user privilege escalation bug (#13976)

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The AddUser() API endpoint was accepting a policy field. 
This API is used to update a user's secret key and account 
status, and allows a regular user to update their own secret key. 

The policy update is also applied though does not appear to 
be used by any existing client-side functionality.

This fix changes the accepted request body type and removes 
the ability to apply policy changes as that is possible via the 
policy set API.

NOTE: Changing passwords can be disabled as a workaround
for this issue by adding an explicit "Deny" rule to disable the API
for users.
This commit is contained in:
Aditya Manthramurthy
2021-12-23 09:21:21 -08:00
committed by GitHub
parent 416977436e
commit 5a96cbbeaa
7 changed files with 143 additions and 31 deletions
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go.sum
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@@ -1088,8 +1088,8 @@ github.com/minio/kes v0.14.0/go.mod h1:OUensXz2BpgMfiogslKxv7Anyx/wj+6bFC6qA7BQc
github.com/minio/madmin-go v1.0.12/go.mod h1:BK+z4XRx7Y1v8SFWXsuLNqQqnq5BO/axJ8IDJfgyvfs=
github.com/minio/madmin-go v1.1.15/go.mod h1:Iu0OnrMWNBYx1lqJTW+BFjBMx0Hi0wjw8VmqhiOs2Jo=
github.com/minio/madmin-go v1.1.17/go.mod h1:Iu0OnrMWNBYx1lqJTW+BFjBMx0Hi0wjw8VmqhiOs2Jo=
github.com/minio/madmin-go v1.1.18 h1:1jXRb9LTiXqbZWBjXYmlqI5eCWsyZlprrI5CEVQjjqY=
github.com/minio/madmin-go v1.1.18/go.mod h1:Iu0OnrMWNBYx1lqJTW+BFjBMx0Hi0wjw8VmqhiOs2Jo=
github.com/minio/madmin-go v1.1.20 h1:jig4gJi0CD+FYz+Cnd+TNo0oqhNaZcLmfUqNl5b46Eo=
github.com/minio/madmin-go v1.1.20/go.mod h1:Iu0OnrMWNBYx1lqJTW+BFjBMx0Hi0wjw8VmqhiOs2Jo=
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github.com/minio/mc v0.0.0-20211207230606-23a05f5a17f2/go.mod h1:siI9jWTzj1KsNXgz6NOL/S7OTaAUM0OMi+zEkF08gnA=
github.com/minio/md5-simd v1.1.0/go.mod h1:XpBqgZULrMYD3R+M28PcmP0CkI7PEMzB3U77ZrKZ0Gw=