Host file disclosure via followed sandbox symlink
Published Jun 19, 2024 · Updated Aug 2, 2024
Path traversal in Wasmer 4.3.1 and earlier allows local users to read host files through a symlink in a preopened directory. The WASI path_open implementation follows the link and opens its resolved host path when create and write rights are combined instead of rejecting escape from the mapped sandbox. Exploitation requires a caller to preopen a directory and grant create and write rights; a crafted program can read host data or crash the runtime.
Summary
What happened
Path traversal in Wasmer 4.3.1 and earlier allows local users to read host files through a symlink in a preopened directory. The WASI path_open implementation follows the link and opens its resolved host path when create and write rights are combined instead of rejecting escape from the mapped sandbox. Exploitation requires a caller to preopen a directory and grant create and write rights; a crafted program can read host data or crash the runtime.
The record
- CVE
- CVE-2024-38358
- Published
- Jun 19, 2024
- Updated
- Aug 2, 2024
- Vendor
- Wasmer
- Product
- Wasmer
- Classifications
- CWE-22, T1611
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 19, 2024CVE publishedPublication date reported by the CVE source.
- Aug 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 <4.3.2
- Affected versionversion=< 4.3.2
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- Wasmer symlink sandbox escape proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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