Guest-to-host code execution via unchecked RNDIS pointer
Published May 11, 2021 · Updated Aug 3, 2024
Memory corruption in Hyper-V on affected Windows builds allows guest OS users to execute code on the host via a crafted RNDIS packet. VmsIfrInfoParams_OID_SWITCH_NIC_REQUEST accepts attacker-controlled request data and dereferences a guest-supplied pointer twice without validating it. Access to a guest virtual machine and its VMBus network path is required; successful exploitation grants host-level execution or crashes the host.
Summary
What happened
Memory corruption in Hyper-V on affected Windows builds allows guest OS users to execute code on the host via a crafted RNDIS packet. VmsIfrInfoParams_OID_SWITCH_NIC_REQUEST accepts attacker-controlled request data and dereferences a guest-supplied pointer twice without validating it. Access to a guest virtual machine and its VMBus network path is required; successful exploitation grants host-level execution or crashes the host.
The record
- CVE
- CVE-2021-28476
- Published
- May 11, 2021
- Updated
- Aug 3, 2024
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- T1611
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 11, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=10.0.0 <10.0.10240.18931
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- 0vercl0k guest-to-host Hyper-V proof of conceptfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo