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Uncontrolled Resource Consumption

CVE-2023-34328

Medium
5.5/10

Summary

AMD CPUs since around 2014 feature extensions for standard x86 debugging. Xen supports these extensions for guest usage. However, errors in Xen's handling of guest state introduce Denial of Service (DoS) vulnerabilities. Specifically, a PV vCPU can set a breakpoint over the live GDT, enabling the exploitation of XSA-156 / CVE-2015-8104 and causing a complete CPU lockup. This issue affects xen versions 4.5.0-rc1 through RELEASE-4.15.7, 4.16.0-rc1 through RELEASE-4.16.5, 4.17.0-rc1 through RELEASE-4.17.2, and 4.18.0-rc1 through 4.18.0-rc2.

  • LOW
  • LOCAL
  • NONE
  • UNCHANGED
  • NONE
  • LOW
  • NONE
  • HIGH

CWE-400 - Uncontrolled resource consumption

An uncontrolled resource allocation attack (also known as resource exhaustion attack) triggers unauthorized overconsumption of the limited resources in an application, such as memory, file system storage, database connection pool entries, and CPU. This may lead to denial of service for valid users and degradation of the application's functionality as well as that of the host operating system.

References

Advisory Timeline

  • Published