Privilege escalation via overflowing RNDIS buffer offset
Published Oct 11, 2022 · Updated Aug 3, 2024
Integer overflow in the Android kernel USB RNDIS handler allows physically proximate attackers to gain elevated privileges via a malicious USB device. rndis_set_response checks BufOffset + 8 after 32-bit addition, so a very large InformationBufferOffset wraps and bypasses the bounds check before the resulting pointer reaches gen_ndis_set_resp. Exploitation requires an attached malicious USB device but needs no prior execution privileges or user interaction, and it produces a kernel out-of-bounds write.
Summary
What happened
Integer overflow in the Android kernel USB RNDIS handler allows physically proximate attackers to gain elevated privileges via a malicious USB device. rndis_set_response checks BufOffset + 8 after 32-bit addition, so a very large InformationBufferOffset wraps and bypasses the bounds check before the resulting pointer reaches gen_ndis_set_resp. Exploitation requires an attached malicious USB device but needs no prior execution privileges or user interaction, and it produces a kernel out-of-bounds write.
The record
- CVE
- CVE-2022-20423
- Published
- Oct 11, 2022
- Updated
- Aug 3, 2024
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- CWE-190, T1404
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 11, 2022CVE 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=Android kernel
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
No public exploit references are available in this record.
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