File access outside restricted directory via crafted filename
Published Jul 13, 2021 · Updated Aug 3, 2024
Path traversal in Huawei Mate 20 and related smartphones allows attackers to access files outside restricted directories via USB. The affected file-handling code builds a pathname from an external filename without validating that the result remains under the intended restricted parent directory, so traversal sequences reach locations outside that directory. Exploitation requires the attacker to connect the smartphone through USB and can disclose files; the advisory does not report integrity or availability impact.
Summary
What happened
Path traversal in Huawei Mate 20 and related smartphones allows attackers to access files outside restricted directories via USB. The affected file-handling code builds a pathname from an external filename without validating that the result remains under the intended restricted parent directory, so traversal sequences reach locations outside that directory. Exploitation requires the attacker to connect the smartphone through USB and can disclose files; the advisory does not report integrity or availability impact.
The record
- CVE
- CVE-2021-22440
- Published
- Jul 13, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1083
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 13, 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?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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