Process crash via unchecked indentation buffer writes
Published Dec 31, 2021 · Updated Aug 4, 2024
Stack-based buffer overflow in UltraJSON through 5.1.0 allows local users to crash an encoding process by specifying excessive indentation. The encode path reserves output space without accounting for indentation, then Buffer_AppendIndentUnchecked writes indentation beyond the stack buffer. Exploitation requires direct access to the Python API or an application that exposes control of the indent argument, and the demonstrated result is process termination.
Summary
What happened
Stack-based buffer overflow in UltraJSON through 5.1.0 allows local users to crash an encoding process by specifying excessive indentation. The encode path reserves output space without accounting for indentation, then Buffer_AppendIndentUnchecked writes indentation beyond the stack buffer. Exploitation requires direct access to the Python API or an application that exposes control of the indent argument, and the demonstrated result is process termination.
The record
- CVE
- CVE-2021-45958
- Published
- Dec 31, 2021
- Updated
- Aug 4, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 31, 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.
Public exploit references
- Large-indent segmentation-fault reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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