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Insufficiently Protected Credentials via Insecure Temporary File in org.apache.nifi:nifi-single-user-utils

Moderate severity GitHub Reviewed Published Apr 6, 2022 in JLLeitschuh/security-research • Updated Aug 17, 2023

Package

maven org.apache.nifi:nifi-single-user-utils (Maven)

Affected versions

<= 1.15.3

Patched versions

1.16

Description

Impact

org.apache.nifi.authentication.single.user.writer.StandardLoginCredentialsWriter contains a local information disclosure vulnerability due to writing credentials (username and password) to a file that is readable by all other users on unix-like systems. On unix-like systems, the system's temporary directory is shared between all users on that system. As such, files written to that directory without setting the correct file permissions can allow other users on that system to view the contents of the files written to those temporary files.

Source

An insecure temporary file is created here:

The username and password credentials are written to this file here:

Patches

The vulnerability has been patched in version 1.16.

Prerequisites

This vulnerability impacts Unix-like systems, and very old versions of Mac OSX and Windows as they all share the system temporary directory between all users.

Workarounds

Setting the java.io.tmpdir system environment variable to a directory that is exclusively owned by the executing user will fix this vulnerability for all operating systems.

References

References

@JLLeitschuh JLLeitschuh published to JLLeitschuh/security-research Apr 6, 2022
Published by the National Vulnerability Database Apr 6, 2022
Published to the GitHub Advisory Database Jun 20, 2022
Reviewed Jun 20, 2022
Last updated Aug 17, 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
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:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS score

0.046%
(19th percentile)

Weaknesses

CVE ID

CVE-2022-26850

GHSA ID

GHSA-rvp4-r3g6-8hxq

Source code

No known source code

Credits

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