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Null Byte Injection in Plug.Static

High severity GitHub Reviewed Published Apr 12, 2022 to the GitHub Advisory Database • Updated Jan 11, 2023

Package

erlang plug (Erlang)

Affected versions

< 1.0.4
>= 1.1.0, < 1.1.7
>= 1.2.0, < 1.2.3
>= 1.3.0, < 1.3.2

Patched versions

1.0.4
1.1.7
1.2.3
1.3.2

Description

Plug.Static is used for serving static assets, and is vulnerable to null
byte injection. If file upload functionality is provided, this can allow
users to bypass filetype restrictions.
We recommend all applications that provide file upload functionality and
serve those uploaded files locally with Plug.Static to upgrade immediately
or include the fix below. If uploaded files are rather stored and served
from S3 or any other cloud storage, you are not affected.

References

Published to the GitHub Advisory Database Apr 12, 2022
Reviewed Apr 12, 2022
Last updated Jan 11, 2023

Severity

High

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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.044%
(14th percentile)

Weaknesses

CVE ID

CVE-2017-1000052

GHSA ID

GHSA-2q6v-32mr-8p8x

Source code

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