ServerMigrationServiceRole

Last Modified

Aug 1, 2020

August 1, 2020 at 04:49 AM UTC

Version

Total Versions

Created

Aug 1, 2020

Actions

Subscribe to updates

Risk

High

An unrestricted escalation path, identity administration, secret reads or the power to switch off security monitoring. Read from this policy document alone: trust policies, boundaries and SCPs in your account still decide what actually succeeds. How this is assessed

High
Can take over existing resources that run as another role
Grants every action of 1 documented escalation path on any resource with no condition.
- ssm-002ssm:SendCommandunrestricted
Use with caution: List the roles attached to the functions, instances, pipelines or notebooks it can modify: the holder effectively has them too.
Medium
Can launch resources that run as a more privileged role
Grants the actions of 2 documented escalation paths, but only on named resources or under a condition. Review that scope before trusting it.
- cloudformation-001iam:PassRole + cloudformation:CreateStackscoped
  - iam:PassRole: condition iam:AssociatedResourceArn
  - cloudformation:CreateStack: condition cloudformation:ResourceTypes, on arn:aws:cloudformation:*:*:stack/sms-app-*/*
- cloudformation-005cloudformation:CreateChangeSet + cloudformation:ExecuteChangeSetscoped
  - cloudformation:CreateChangeSet: condition cloudformation:ResourceTypes, on arn:aws:cloudformation:*:*:stack/sms-app-*/*
  - cloudformation:ExecuteChangeSet: condition cloudformation:ResourceTypes, on arn:aws:cloudformation:*:*:stack/sms-app-*/*
Use with caution: Check which roles, users or policies fall inside the scope shown above. Within it the escalation works as documented, so keep privileged principals out of it.

Policy Document

View on GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138{
  "PolicyVersion": {
    "Document": {
      "Version": "2012-10-17",
      "Statement": [
        {
          "Action": [
            "cloudformation:CreateChangeSet",
            "cloudformation:CreateStack",
            "cloudformation:DeleteStack",
            "cloudformation:ExecuteChangeSet"
          ],
          "Resource": "arn:aws:cloudformation:*:*:stack/sms-app-*/*",
          "Effect": "Allow",
          "Condition": {
            "ForAllValues:StringLikeIfExists": {
              "cloudformation:ResourceTypes": [
                "AWS::EC2::*"
              ]
            }
          }
        },
        {
          "Action": [
            "cloudformation:DeleteChangeSet",
            "cloudformation:DescribeChangeSet",
            "cloudformation:DescribeStackEvents",
            "cloudformation:DescribeStackResources",
            "cloudformation:GetTemplate"
          ],
          "Resource": "arn:aws:cloudformation:*:*:stack/sms-app-*/*",
          "Effect": "Allow"
        },
        {
          "Action": [
            "cloudformation:DescribeStacks",
            "cloudformation:ValidateTemplate",
            "cloudformation:DescribeStackResource",
            "s3:ListAllMyBuckets"
          ],
          "Resource": "*",
          "Effect": "Allow"
        },
        {
          "Action": [
            "s3:CreateBucket",
            "s3:DeleteBucket",
            "s3:DeleteObject",
            "s3:GetBucketAcl",
            "s3:GetBucketLocation",
            "s3:GetObject",
            "s3:ListBucket",
            "s3:PutObject",
            "s3:PutObjectAcl",
            "s3:PutLifecycleConfiguration",
            "s3:ListAllMyBuckets"
          ],
          "Resource": "arn:aws:s3:::sms-app-*",
          "Effect": "Allow"
        },
        {
          "Action": [
            "sms:CreateReplicationJob",
            "sms:DeleteReplicationJob",
            "sms:GetReplicationJobs",
            "sms:GetReplicationRuns",
            "sms:GetServers",
            "sms:ImportServerCatalog",
            "sms:StartOnDemandReplicationRun",
            "sms:UpdateReplicationJob"
          ],
          "Resource": "*",
          "Effect": "Allow"
        },
        {
          "Action": "ssm:SendCommand",
          "Resource": [
            "arn:aws:ssm:*:*:document/AWS-RunRemoteScript",
            "arn:aws:ssm:*:*:document/AWS-RunPowerShellScript",
            "arn:aws:ssm:*:*:document/AWS-RunShellScript",
            "arn:aws:ec2:*:*:instance/*",
            "arn:aws:ssm:*:*:managed-instance/*",
            "arn:aws:s3:::*"
          ],
          "Effect": "Allow"
        },
        {
          "Action": [
            "ssm:CancelCommand",
            "ssm:GetCommandInvocation"
          ],
          "Resource": "*",
          "Effect": "Allow"
        },
        {
          "Action": [
            "ec2:ModifySnapshotAttribute",
            "ec2:CopySnapshot",
            "ec2:CopyImage",
            "ec2:Describe*",
            "ec2:DeleteSnapshot",
            "ec2:DeregisterImage",
            "ec2:CreateTags",
            "ec2:DeleteTags",
            "ec2:ImportImage",
            "ec2:DescribeImportImageTasks",
            "ec2:GetEbsEncryptionByDefault"
          ],
          "Resource": "*",
          "Effect": "Allow"
        },
        {
          "Action": "iam:GetRole",
          "Resource": "*",
          "Effect": "Allow"
        },
        {
          "Action": "iam:PassRole",
          "Resource": "*",
          "Effect": "Allow",
          "Condition": {
            "StringLike": {
              "iam:AssociatedResourceArn": "arn:aws:cloudformation:*:*:stack/sms-app-*/*"
            }
          }
        },
        {
          "Effect": "Allow",
          "Action": "iam:GetInstanceProfile",
          "Resource": "*"
        }
      ]
    },
    "VersionId": "v7",
    "IsDefaultVersion": true,
    "CreateDate": "2020-08-01T03:40:03Z"
  }
}