Arbitrary file access via symlink path traversal
Published Feb 23, 2024 · Updated Aug 1, 2024
Path traversal in Backstage backend-common before 0.19.10, 0.20.0 through 0.20.1, and 0.21.0 allows remote authenticated users to access files. resolveSafeChildPath canonicalizes the base for its containment check but joins the requested child to the unresolved base, letting a base-directory symlink redirect the returned path outside the allowed tree. Exploitation requires symlink injection and a reachable utility caller; that caller determines whether redirected access reads or writes files.
Summary
What happened
Path traversal in Backstage backend-common before 0.19.10, 0.20.0 through 0.20.1, and 0.21.0 allows remote authenticated users to access files. resolveSafeChildPath canonicalizes the base for its containment check but joins the requested child to the unresolved base, letting a base-directory symlink redirect the returned path outside the allowed tree. Exploitation requires symlink injection and a reachable utility caller; that caller determines whether redirected access reads or writes files.
The record
- CVE
- CVE-2024-26150
- Published
- Feb 23, 2024
- Updated
- Aug 1, 2024
- Vendor
- Backstage
- Product
- Backstage
- Classifications
- CWE-22, T1005
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 23, 2024CVE publishedPublication date reported by the CVE source.
- Aug 1, 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=< 0.19.10
- Affected versionversion=>= 0.20.0, < 0.20.2
- Affected versionversion== 0.21.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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