Application crash via NUL-prefixed configuration line
Published Feb 23, 2024 · Updated Feb 13, 2025
Buffer under-read in c-ares before 1.27.0 allows local users to crash applications via a NUL-prefixed configuration-file line. In ares__read_line(), an initial NUL produces a zero length, but the parser still indexes the byte at length minus one, reading before the buffer. High privileges are required to modify the parsed local configuration, and the resulting availability impact is limited to the consuming application.
Summary
What happened
Buffer under-read in c-ares before 1.27.0 allows local users to crash applications via a NUL-prefixed configuration-file line. In ares__read_line(), an initial NUL produces a zero length, but the parser still indexes the byte at length minus one, reading before the buffer. High privileges are required to modify the parsed local configuration, and the resulting availability impact is limited to the consuming application.
The record
- CVE
- CVE-2024-25629
- Published
- Feb 23, 2024
- Updated
- Feb 13, 2025
- Vendor
- c-ares Project
- Product
- c-ares
- Classifications
- CWE-125, CWE-127, T1499.004
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Feb 23, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record 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=< 1.27.0
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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