Arbitrary code execution via unsafe YAML loading
Published Jul 31, 2023 · Updated Oct 22, 2024
Deserialization of untrusted data in Ultralytics YOLOv5 allows local attackers to execute arbitrary code through a crafted YAML file. Its configuration-loading paths pass attacker-controlled YAML to PyYAML's yaml.load(), permitting Python object construction instead of restricting parsing to safe scalar and collection types. Exploitation requires a local user or another user to make a victim process load the crafted configuration file, after which code runs with that process's privileges.
Summary
What happened
Deserialization of untrusted data in Ultralytics YOLOv5 allows local attackers to execute arbitrary code through a crafted YAML file. Its configuration-loading paths pass attacker-controlled YAML to PyYAML's yaml.load(), permitting Python object construction instead of restricting parsing to safe scalar and collection types. Exploitation requires a local user or another user to make a victim process load the crafted configuration file, after which code runs with that process's privileges.
The record
- CVE
- CVE-2021-31680
- Published
- Jul 31, 2023
- Updated
- Oct 22, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-502, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 31, 2023CVE publishedPublication date reported by the CVE source.
- Oct 22, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
- huntr YOLOv5 YAML deserialization proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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