Arbitrary file write via incomplete path sanitization
Published Dec 24, 2021 · Updated Sep 16, 2024
Directory traversal in Kataras Iris allows remote authenticated users to write files outside the configured upload directory. UploadFormFiles removes ../ and ..\ substrings in one pass rather than reducing each client-supplied filename to its base component, so overlapping traversal sequences survive. Exploitation requires an application route that calls UploadFormFiles and a build made with Go before 1.17; the attacker can overwrite files writable by the service account.
Summary
What happened
Directory traversal in Kataras Iris allows remote authenticated users to write files outside the configured upload directory. UploadFormFiles removes ../ and ..\ substrings in one pass rather than reducing each client-supplied filename to its base component, so overlapping traversal sequences survive. Exploitation requires an application route that calls UploadFormFiles and a build made with Go before 1.17; the attacker can overwrite files writable by the service account.
The record
- CVE
- CVE-2021-23772
- Published
- Dec 24, 2021
- Updated
- Sep 16, 2024
- Vendor
- Kataras
- Product
- Iris
- Classifications
- CWE-59, T1105
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 24, 2021CVE publishedPublication date reported by the CVE source.
- Sep 16, 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?
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- Affected versionversion=0 <unspecified
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
- Snyk multipart filename traversal proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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