Undefined behavior via erroneous nanosecond multiplication
Published Aug 20, 2024 · Updated Aug 20, 2024
Integer overflow in Newlib 4.3.0 allows attackers to trigger undefined behavior through the RISC-V gettimeofday implementation. The libgloss _gettimeofday code multiplies nanoseconds by 1,000 instead of dividing by 1,000 when populating microseconds. Reachability requires firmware built with that RISC-V syscall implementation and code that invokes gettimeofday; the directly demonstrated result is incorrect time data, not code execution.
Summary
What happened
Integer overflow in Newlib 4.3.0 allows attackers to trigger undefined behavior through the RISC-V gettimeofday implementation. The libgloss _gettimeofday code multiplies nanoseconds by 1,000 instead of dividing by 1,000 when populating microseconds. Reachability requires firmware built with that RISC-V syscall implementation and code that invokes gettimeofday; the directly demonstrated result is incorrect time data, not code execution.
The record
- CVE
- CVE-2024-30949
- Published
- Aug 20, 2024
- Updated
- Aug 20, 2024
- Vendor
- Newlib Project
- Product
- Newlib
- Classifications
- CWE-190, CWE-787, CAPEC-92
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 2024CVE publishedPublication date reported by the CVE source.
- Aug 20, 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?
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- Affected versionversion=4.3.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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