Request-processing stall via per-byte boundary logging
Published Dec 2, 2024 · Updated Dec 2, 2024
Denial of service in Kludex python-multipart before 0.0.18 allows remote attackers to stall request processing with crafted form data. MultipartParser advances through line breaks before the first boundary and bytes after the final boundary one byte at a time while emitting warning logs. Exposure requires an application or framework to parse attacker-controlled multipart form data; excess input drives high CPU use and can stall an ASGI event loop, blocking other requests.
Summary
What happened
Denial of service in Kludex python-multipart before 0.0.18 allows remote attackers to stall request processing with crafted form data. MultipartParser advances through line breaks before the first boundary and bytes after the final boundary one byte at a time while emitting warning logs. Exposure requires an application or framework to parse attacker-controlled multipart form data; excess input drives high CPU use and can stall an ASGI event loop, blocking other requests.
The record
- CVE
- CVE-2024-53981
- Published
- Dec 2, 2024
- Updated
- Dec 2, 2024
- Vendor
- Kludex
- Product
- python-multipart
- Classifications
- CWE-770, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 2, 2024CVE publishedPublication date reported by the CVE source.
- Dec 2, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.0.18
- Affected versionversion=< 0.0.18
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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