Vulnerability · Published Sep 9, 2021 · Assigned by GitHub_M

CVE-2021-32836Pre-auth unsafe deserialization in ZStack

High 7.5

In plain English

A high-severity code injection in zstack from zstackio. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)2.0%top 18.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
zstackio	zstack	< 3.10.12>= 4.0.0, < 4.1.6

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H

References

https://github.com/zstackio/zstack/security/advisories/GHSA-jfvq-548h-342x x_refsource_CONFIRM
https://securitylab.github.com/advisories/GHSL-2021-087-zstack/ x_refsource_MISC