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GHSA-c3p4-vm8f-386p

MediumCVSS 6.9 / 10
Published Feb 25, 2025·Last modified Mar 3, 2025
Affected Components(0)

No affected components available

Description

Summary

In certain Subsonic API endpoints, authentication can be bypassed by using a non-existent username combined with an empty (salted) password hash. This allows read-only access to the server’s resources, though attempts at write operations fail with a “permission denied” error.

Details

A flaw in the authentication check process allows an attacker to specify any arbitrary username that does not exist on the system, along with a salted hash of an empty password. Under these conditions, Navidrome treats the request as authenticated, granting access to various Subsonic endpoints without requiring valid credentials.

Proof of Concept (PoC)

  1. Generate a random salt:

    // e.g., salt = "x1vbudn1m6d"
Math.random().toString(36).substring(2, 15)

  2. Calculate the MD5 hash of an empty password plus the salt:

    # Using the example salt above
echo -n "x1vbudn1m6d" | md5sum
81f0c0fb5d202ab0d012e6eaeb722d79  -

  3. Send a request specifying a fake user, with the hash and salt values:

    GET https://[host]/rest/getPlaylists?u=FakeUser&t=81f0c0fb5d202ab0d012e6eaeb722d79&s=x1vbudn1m6d&v=1.16.1&c=castafiore&f=json

Impact

An attacker can use any non-existent username to bypass the authentication system and gain access to various read-only data in Navidrome, such as user playlists. However, any attempt to modify data fails due to insufficient permissions, limiting the impact to unauthorized viewing of information.

Risk Scores
Base Score
6.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
2.7

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
0.95%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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