Buffer overflow via Zip size-hint underflow
Published Apr 11, 2021 · Updated Aug 3, 2024
Buffer overflow in Rust standard library Zip 1.14.0 through 1.51.0 allows attackers to corrupt memory by reusing a consumed iterator. In ZipImpl::size_hint, self.index can exceed self.len after Zip advances a side-effecting longer iterator, so subtracting them wraps to a huge length. Triggering the flaw requires code to reuse the consumed specialized Zip; the bad size hint can drive unchecked access beyond the iterator's buffer and terminate or corrupt the process.
Summary
What happened
Buffer overflow in Rust standard library Zip 1.14.0 through 1.51.0 allows attackers to corrupt memory by reusing a consumed iterator. In ZipImpl::size_hint, self.index can exceed self.len after Zip advances a side-effecting longer iterator, so subtracting them wraps to a huge length. Triggering the flaw requires code to reuse the consumed specialized Zip; the bad size hint can drive unchecked access beyond the iterator's buffer and terminate or corrupt the process.
The record
- CVE
- CVE-2021-28879
- Published
- Apr 11, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 11, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
- Safe Rust Zip segfault demonstrationproof of concept · demonstrated
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Technologies
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