Arbitrary file write via unsanitized object keys
Published Nov 29, 2021 · Updated Aug 3, 2024
Path traversal in S3Scanner before 2.0.2 allows attackers to write files outside the selected dump directory via crafted S3 object keys. S3Service.download_file joins each untrusted object key to --dump-dir and normalizes the result without checking that the path remains inside that directory. Exploitation requires an operator to dump an attacker-controlled bucket, after which the file is written with the operator's filesystem permissions.
Summary
What happened
Path traversal in S3Scanner before 2.0.2 allows attackers to write files outside the selected dump directory via crafted S3 object keys. S3Service.download_file joins each untrusted object key to --dump-dir and normalizes the result without checking that the path remains inside that directory. Exploitation requires an operator to dump an attacker-controlled bucket, after which the file is written with the operator's filesystem permissions.
The record
- CVE
- CVE-2021-32061
- Published
- Nov 29, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-22
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 29, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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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.
Weakness, pattern, technique
Public exploit references
- Malicious bucket traversal demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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