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Tauri's readDir Endpoint Scope can be Bypassed With Symbolic Links

Moderate severity GitHub Reviewed Published Sep 15, 2022 in tauri-apps/tauri • Updated Feb 7, 2023

Package

cargo tauri (Rust)

Affected versions

< 1.0.6

Patched versions

1.0.6

Description

Impact

Due to missing canonicalization when readDir is called recursively, it was possible to display directory listings outside of the defined fs scope. This required a crafted symbolic link or junction folder inside an allowed path of the fs scope. No arbitrary file content could be leaked.

Patches

The issue has been resolved in tauri-apps/tauri#5123 and the implementation now properly checks if the
requested (sub) directory is a symbolic link outside of the defined scope.

Workarounds

Disable the readDir endpoint in the allowlist inside the tauri.conf.json.

For more information

This issue was initially reported by martin-ocasek in #4882.

If you have any questions or comments about this advisory:

References

@tweidinger tweidinger published to tauri-apps/tauri Sep 15, 2022
Published by the National Vulnerability Database Sep 15, 2022
Published to the GitHub Advisory Database Sep 16, 2022
Reviewed Sep 16, 2022
Last updated Feb 7, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

EPSS score

0.103%
(43rd percentile)

Weaknesses

CVE ID

CVE-2022-39215

GHSA ID

GHSA-28m8-9j7v-x499

Source code

Credits

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