Memory disclosure or crash via repeated borrowing
Published Apr 14, 2021 · Updated Aug 4, 2024
Memory unsafety in Rust standard library before 1.52.0 allows context-dependent attackers to disclose memory or crash programs via join. join_generic_copy borrows each value to calculate a buffer length, borrows it again to copy data, then assigns the result the earlier length, potentially leaving bytes uninitialized. Exploitation requires a Borrow implementation that returns different strings between calls, and the resulting effect is limited to memory disclosure or process failure.
Summary
What happened
Memory unsafety in Rust standard library before 1.52.0 allows context-dependent attackers to disclose memory or crash programs via join. join_generic_copy borrows each value to calculate a buffer length, borrows it again to copy data, then assigns the result the earlier length, potentially leaving bytes uninitialized. Exploitation requires a Borrow implementation that returns different strings between calls, and the resulting effect is limited to memory disclosure or process failure.
The record
- CVE
- CVE-2020-36323
- Published
- Apr 14, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-134
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 14, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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
- Safe-Rust join reproductionproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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