GHSA-6h3m-36w8-hv68

Source

https://github.com/advisories/GHSA-6h3m-36w8-hv68

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-6h3m-36w8-hv68/GHSA-6h3m-36w8-hv68.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-6h3m-36w8-hv68

Aliases

Published

2022-03-10T22:07:30Z

Modified

2026-07-08T06:29:51Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N CVSS Calculator

Summary

Arbitrary file write in nats-server

Details

(This document is canonically: https://advisories.nats.io/CVE/CVE-2022-26652.txt)

Background

NATS.io is a high performance open source pub-sub distributed communication technology, built for the cloud, on-premise, IoT, and edge computing.

JetStream is the optional RAFT-based resilient persistent feature of NATS.

Problem Description

The JetStream streams can be backed up and restored via NATS. The backup format is a tar archive file. Inadequate checks on the filenames within the archive file permit a so-called "Zip Slip" attack in the stream restore.

NATS nats-server through 2022-03-09 (fixed in release 2.7.4) did not correctly sanitize elements of the archive file, thus a user of NATS could cause the NATS server to write arbitrary content to an attacker-controlled filename.

Affected versions

NATS Server:

2.2.0 up to and including 2.7.3.
- Introduced with JetStream Restore functionality
Fixed with nats-io/nats-server: 2.7.4
Docker image: nats https://hub.docker.com/_/nats
NB users of OS package files from our releases: a change in goreleaser defaults, discovered late in the release process, moved the install directory from /usr/local/bin to /usr/bin; we are evaluating the correct solution for subsequent releases, but not recutting this release.

NATS Streaming Server

0.15.0 up to and including 0.24.2
Fixed with nats-io/nats-streaming-server: 0.24.3
Embeds a nats-server, but this server is the old approach which JetStream replaces, so unlikely (but not impossible) to be configured with JS support

Workarounds

Disable JetStream for untrusted users.
If only one NATS account uses JetStream, such that cross-user attacks are not an issue, and any user in that account with access to the JetStream API is fully trusted anyway, then appropriate sandboxing techniques will prevent exploit.
- Eg, with systemd, the supplied util/nats-server-hardened.service example configuration demonstrates that NATS runs fine as an unprivileged user under ProtectSystem=strict and PrivateTmp=true restrictions; by only opening a ReadWritePaths hole for the JetStream storage area, the impact of this vulnerability is limited.

Solution

Upgrade the NATS server to at least 2.7.4.

We fully support the util/nats-server-hardened.service configuration for running a NATS server and encourage this approach.

Credits

This issue was reported (on 2022-03-07) to the NATS Maintainers by Yiming Xiang, TIANJI LAB of NSFOCUS.
Thank you / 谢谢你！

Database specific

{
    "cwe_ids":  [
        "CWE-22"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2022-03-10T22:07:30Z",
    "nvd_published_at":  "2022-03-10T17:47:00Z",
    "severity":  "HIGH"
}

References

Affected packages

Go / github.com/nats-io/nats-server/v2

Package

Name: github.com/nats-io/nats-server/v2; View open source insights on deps.dev
Purl: pkg:golang/github.com/nats-io/nats-server/v2

Affected ranges

Type: SEMVER
Events: Introduced

2.2.0

Fixed

2.7.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-6h3m-36w8-hv68/GHSA-6h3m-36w8-hv68.json"

Go / github.com/nats-io/nats-streaming-server

Package

Name: github.com/nats-io/nats-streaming-server; View open source insights on deps.dev
Purl: pkg:golang/github.com/nats-io/nats-streaming-server

Affected ranges

Type: SEMVER
Events: Introduced

0.15.0

Fixed

0.24.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-6h3m-36w8-hv68/GHSA-6h3m-36w8-hv68.json"