Vulnerability · Published Jun 19, 2024 · Assigned by GitHub_M

CVE-2024-38358Symlink bypasses filesystem sandbox in wasmer

Low 2.9

In plain English

A low-severity path traversal in wasmer from wasmerio. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).

Severity (CVSS 3.1)2.9Low

Exploit odds (30 days)0.2%top 90.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Wasmer is a web assembly (wasm) Runtime supporting WASIX, WASI and Emscripten. If the preopened directory has a symlink pointing outside, WASI programs can traverse the symlink and access host filesystem if the caller sets both `oflags::creat` and `rights::fd_write`. Programs can also crash the runtime by creating a symlink pointing outside with `path_symlink` and `path_open`ing the link. This issue has been addressed in commit `b9483d022` which has been included in release version 4.3.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products (as reported)

Vendor	Product	Versions
wasmerio	wasmer	< 4.3.2

Weakness: CWE-22 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References

https://github.com/wasmerio/wasmer/security/advisories/GHSA-55f3-3qvg-8pv5 x_refsource_CONFIRM
https://github.com/wasmerio/wasmer/commit/b9483d022c602b994103f78ecfe46f017f8ac662 x_refsource_MISC