Vulnerability Details : CVE-2021-32836
ZStack is open source IaaS(infrastructure as a service) software. In ZStack before versions 3.10.12 and 4.1.6 there is a pre-auth unsafe deserialization vulnerability in the REST API. An attacker in control of the request body will be able to provide both the class name and the data to be deserialized and therefore will be able to instantiate an arbitrary type and assign arbitrary values to its fields. This issue may lead to a Denial Of Service. If a suitable gadget is available, then an attacker may also be able to exploit this vulnerability to gain pre-auth remote code execution. For additional details see the referenced GHSL-2021-087.
Vulnerability category: Execute codeDenial of service
Products affected by CVE-2021-32836
- cpe:2.3:a:zstack:zstack:*:*:*:*:*:*:*:*
- cpe:2.3:a:zstack:zstack:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-32836
0.61%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 79 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-32836
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST | |
|
8.1
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H |
2.2
|
4.7
|
GitHub, Inc. |
CWE ids for CVE-2021-32836
-
The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.Assigned by: security-advisories@github.com (Secondary)
-
The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-32836
-
https://securitylab.github.com/advisories/GHSL-2021-087-zstack/
GHSL-2021-087: Pre-auth unsafe deserialization in ZStack - CVE-2021-32836 | GitHub Security LabExploit;Third Party Advisory
-
https://github.com/zstackio/zstack/security/advisories/GHSA-jfvq-548h-342x
Pre-auth unsafe deserialization in ZStack REST API · Advisory · zstackio/zstack · GitHubThird Party Advisory
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