CVE-2021-32829
ZStack REST API Groovy Shell Sandbox Bypass Remote Code Execution
Description
ZStack is open source IaaS(infrastructure as a service) software aiming to automate datacenters, managing resources of compute, storage, and networking all by APIs. Affected versions of ZStack REST API are vulnerable to post-authentication Remote Code Execution (RCE) via bypass of the Groovy shell sandbox. The REST API exposes the GET zstack/v1/batch-queries?script endpoint which is backed up by the BatchQueryAction class. Messages are represented by the APIBatchQueryMsg, dispatched to the QueryFacadeImpl facade and handled by the BatchQuery class. The HTTP request parameter script is mapped to the APIBatchQueryMsg.script property and evaluated as a Groovy script in BatchQuery.query the evaluation of the user-controlled Groovy script is sandboxed by SandboxTransformer which will apply the restrictions defined in the registered (sandbox.register()) GroovyInterceptor. Even though the sandbox heavily restricts the receiver types to a small set of allowed types, the sandbox is non effective at controlling any code placed in Java annotations and therefore vulnerable to meta-programming escapes. This issue leads to post-authenticated remote code execution. For more details see the referenced GHSL-2021-065. This issue is patched in versions 3.8.21, 3.10.8, and 4.1.0.
INFO
Published Date :
Aug. 17, 2021, 4:15 p.m.
Last Modified :
Nov. 21, 2024, 6:07 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
3.1
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-32829.
| URL | Resource |
|---|---|
| https://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html | Not Applicable |
| https://github.com/zstackio/zstack/security/advisories/GHSA-6xgq-7rqg-x3q5 | Third Party Advisory |
| https://securitylab.github.com/advisories/GHSL-2021-065-zstack/ | Exploit Third Party Advisory |
| https://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html | Not Applicable |
| https://github.com/zstackio/zstack/security/advisories/GHSA-6xgq-7rqg-x3q5 | Third Party Advisory |
| https://securitylab.github.com/advisories/GHSL-2021-065-zstack/ | Exploit Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-32829 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-32829 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html Added Reference https://github.com/zstackio/zstack/security/advisories/GHSA-6xgq-7rqg-x3q5 Added Reference https://securitylab.github.com/advisories/GHSL-2021-065-zstack/ -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Reanalysis by [email protected]
Oct. 25, 2022
Action Type Old Value New Value Added CWE NIST CWE-863 -
Initial Analysis by [email protected]
Aug. 25, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Changed Reference Type https://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html No Types Assigned https://blog.orange.tw/2019/02/abusing-meta-programming-for-unauthenticated-rce.html Not Applicable Changed Reference Type https://github.com/zstackio/zstack/security/advisories/GHSA-6xgq-7rqg-x3q5 No Types Assigned https://github.com/zstackio/zstack/security/advisories/GHSA-6xgq-7rqg-x3q5 Third Party Advisory Changed Reference Type https://securitylab.github.com/advisories/GHSL-2021-065-zstack/ No Types Assigned https://securitylab.github.com/advisories/GHSL-2021-065-zstack/ Exploit, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:zstack:rest_api:*:*:*:*:*:*:*:* versions from (including) 2.2.4 up to (excluding) 3.8.21 *cpe:2.3:a:zstack:rest_api:*:*:*:*:*:*:*:* versions from (including) 3.10.0 up to (excluding) 3.10.8 -
CVE Modified by [email protected]
Aug. 17, 2021
Action Type Old Value New Value Changed Description ZStack is open source IaaS(infrastructure as a service) software aiming to automate datacenters, managing resources of compute, storage, and networking all by APIs. Affected versions of ZStack REST API are vulnerable to post-authentication Remote Code Execution (RCE) via bypass of the Groovy shell sandbox. The REST API exposes the GET zstack/v1/batch-queries?script endpoint which is backed up by the BatchQueryAction class. Messages are represented by the APIBatchQueryMsg, dispatched to the QueryFacadeImpl facade and handled by the BatchQuery class. The HTTP request parameter script is mapped to the APIBatchQueryMsg.script property and evaluated as a Groovy script in BatchQuery.query the evaluation of the user-controlled Groovy script is sandboxed by SandboxTransformer which will apply the restrictions defined in the registered (sandbox.register()) GroovyInterceptor. Even though the sandbox heavily restricts the receiver types to a small set of allowed types, the sandbox is non effective at controlling any code placed in Java annotations and therefore vulnerable to meta-programming escapes. This issue leads to post-authenticated remote code execution. For more details see the referenced GHSL-2021-065. This issue is patched in versions 3.8.21, 3.10.8, and 4.1.0. ZStack is open source IaaS(infrastructure as a service) software aiming to automate datacenters, managing resources of compute, storage, and networking all by APIs. Affected versions of ZStack REST API are vulnerable to post-authentication Remote Code Execution (RCE) via bypass of the Groovy shell sandbox. The REST API exposes the GET zstack/v1/batch-queries?script endpoint which is backed up by the BatchQueryAction class. Messages are represented by the APIBatchQueryMsg, dispatched to the QueryFacadeImpl facade and handled by the BatchQuery class. The HTTP request parameter script is mapped to the APIBatchQueryMsg.script property and evaluated as a Groovy script in BatchQuery.query the evaluation of the user-controlled Groovy script is sandboxed by SandboxTransformer which will apply the restrictions defined in the registered (sandbox.register()) GroovyInterceptor. Even though the sandbox heavily restricts the receiver types to a small set of allowed types, the sandbox is non effective at controlling any code placed in Java annotations and therefore vulnerable to meta-programming escapes. This issue leads to post-authenticated remote code execution. For more details see the referenced GHSL-2021-065. This issue is patched in versions 3.8.21, 3.10.8, and 4.1.0.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-32829 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-32829
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
1.39 }} -0.96%
score
0.78573
percentile