Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1ydnA0LXIzZzYtOGh4cc4AAs4X

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

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:

• https://github.com/apache/nifi/blob/6a1c7c72d5b91b9ce5d5cb5b86e3155d21e2c19b/nifi-commons/nifi-single-user-utils/src/main/java/org/apache/nifi/authentication/single/user/writer/StandardLoginCredentialsWriter.java#L75

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

• https://github.com/apache/nifi/blob/6a1c7c72d5b91b9ce5d5cb5b86e3155d21e2c19b/nifi-commons/nifi-single-user-utils/src/main/java/org/apache/nifi/authentication/single/user/writer/StandardLoginCredentialsWriter.java#L85-L95

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

• https://issues.apache.org/jira/browse/NIFI-9785
• https://github.com/apache/nifi/commit/859d5fe
• https://github.com/apache/nifi/pull/5856
• https://nifi.apache.org/security.html#CVE-2022-26850
• https://twitter.com/JLLeitschuh/status/1511736635645435904?s=20&t=I3w3zF6Y2DUvWYsEFqERjg

Permalink: https://github.com/advisories/GHSA-rvp4-r3g6-8hxq
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1ydnA0LXIzZzYtOGh4cc4AAs4X
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 2 years ago
Updated: 9 months ago

CVSS Score: 6.5
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Identifiers: GHSA-rvp4-r3g6-8hxq, CVE-2022-26850
References:

• https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-rvp4-r3g6-8hxq
• https://nvd.nist.gov/vuln/detail/CVE-2022-26850
• https://nifi.apache.org/security.html#CVE-2022-26850
• http://www.openwall.com/lists/oss-security/2022/04/06/2
• https://github.com/apache/nifi/commit/859d5fe
• https://github.com/apache/nifi/commit/859d5fe8cfe05ad24600b021f0ebf15753a8105c
• https://github.com/advisories/GHSA-rvp4-r3g6-8hxq

Repository: https://github.com/JLLeitschuh/security-research
Blast Radius: 10.7

Affected Packages