Memory corruption via overflowing calloc size calculation
Published Feb 3, 2021 · Updated Aug 4, 2024
Integer overflow in calloc in Wind River VxWorks 6.9 allows remote attackers to corrupt memory through a crafted allocation request. The allocator multiplies the element count by the element size without preventing integer wraparound, then returns a block smaller than the caller-requested buffer; subsequent writes overrun that allocation. Exploitation requires a reachable code path that passes attacker-controlled allocation dimensions to calloc, with consequences confined to memory corruption in the affected process or device.
Summary
What happened
Integer overflow in calloc in Wind River VxWorks 6.9 allows remote attackers to corrupt memory through a crafted allocation request. The allocator multiplies the element count by the element size without preventing integer wraparound, then returns a block smaller than the caller-requested buffer; subsequent writes overrun that allocation. Exploitation requires a reachable code path that passes attacker-controlled allocation dimensions to calloc, with consequences confined to memory corruption in the affected process or device.
The record
- CVE
- CVE-2020-28895
- Published
- Feb 3, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, CWE-190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 3, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 2024Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
Your stack
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