Memory corruption via inconsistent borrowed indexes
Published Mar 5, 2021 · Updated Aug 3, 2024
Memory corruption in nano_arena before 0.5.2 allows context-dependent attackers to cause out-of-bounds writes or use-after-free. The Arena::split_at and ArenaSplit::split_at functions call borrow() twice and trust both results to identify the same arena element. Exploitation requires a Borrow implementation that returns different indexes across the calls, creating aliased mutable references that can corrupt the consuming process.
Summary
What happened
Memory corruption in nano_arena before 0.5.2 allows context-dependent attackers to cause out-of-bounds writes or use-after-free. The Arena::split_at and ArenaSplit::split_at functions call borrow() twice and trust both results to identify the same arena element. Exploitation requires a Borrow implementation that returns different indexes across the calls, creating aliased mutable references that can corrupt the consuming process.
The record
- CVE
- CVE-2021-28032
- Published
- Mar 5, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 5, 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
- split_at can create unsound aliasing violations if Borrow<Idx> returns different indexesproof of concept · 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