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Arbitrary remote file read in Wrangler dev server

Moderate severity GitHub Reviewed Published Dec 29, 2023 in cloudflare/workers-sdk • Updated Jan 3, 2024

Package

npm wrangler (npm)

Affected versions

>= 3.9.0, < 3.19.0

Patched versions

3.19.0

Description

Impact

Sending specially crafted HTTP requests and inspector messages to Wrangler's dev server could result in any file on the user's computer being accessible over the local network. An attacker that could trick any user on the local network into opening a malicious website could also read any file.

Patches

This issue was fixed in [email protected]. Wrangler will now only serve files that are part of your bundle, or referenced by your bundle's source maps.

Workarounds

Configure Wrangler to listen on local interfaces instead with wrangler dev --ip 127.0.0.1. This is the default as of [email protected], and removes the local network as an attack vector, but does not prevent an attack from visiting a malicious website.

References

References

@mskowroncf mskowroncf published to cloudflare/workers-sdk Dec 29, 2023
Published by the National Vulnerability Database Dec 29, 2023
Published to the GitHub Advisory Database Jan 3, 2024
Reviewed Jan 3, 2024
Last updated Jan 3, 2024

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
Adjacent
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
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:A/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

EPSS score

0.045%
(17th percentile)

Weaknesses

CVE ID

CVE-2023-7079

GHSA ID

GHSA-cfph-4qqh-w828

Source code

Credits

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