CVE-2023-34323

xenstored: A transaction conflict can crash C Xenstored

Description

When a transaction is committed, C Xenstored will first check the quota is correct before attempting to commit any nodes. It would be possible that accounting is temporarily negative if a node has been removed outside of the transaction. Unfortunately, some versions of C Xenstored are assuming that the quota cannot be negative and are using assert() to confirm it. This will lead to C Xenstored crash when tools are built without -DNDEBUG (this is the default).

Remediation

Workaround:

  • The problem can be avoided by using OCaml Xenstored variant.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.08%
Vendor Advisory xenproject.org
Affected: Xen Xen
Published at:
Updated at:

References

Link Tags
https://xenbits.xenproject.org/xsa/advisory-440.html patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2023-34323?
CVE-2023-34323 has been scored as a medium severity vulnerability.
How to fix CVE-2023-34323?
As a workaround for remediating CVE-2023-34323: The problem can be avoided by using OCaml Xenstored variant.
Is CVE-2023-34323 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-34323 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-34323?
CVE-2023-34323 affects Xen Xen.
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