Minder by Stacklok is an open source software supply chain security platform. Minder prior to version 0.0.51 is vulnerable to a denial-of-service (DoS) attack which could allow an attacker to crash the Minder server and deny other users access to it. The root cause of the vulnerability is that Minders sigstore verifier reads an untrusted response entirely into memory without enforcing a limit on the response body. An attacker can exploit this by making Minder make a request to an attacker-controlled endpoint which returns a response with a large body which will crash the Minder server. Specifically, the point of failure is where Minder parses the response from the GitHub attestations endpoint in `getAttestationReply`. Here, Minder makes a request to the `orgs/$owner/attestations/$checksumref` GitHub endpoint (line 285) and then parses the response into the `AttestationReply` (line 295). The way Minder parses the response on line 295 makes it prone to DoS if the response is large enough. Essentially, the response needs to be larger than the machine has available memory. Version 0.0.51 contains a patch for this issue. The content that is hosted at the `orgs/$owner/attestations/$checksumref` GitHub attestation endpoint is controlled by users including unauthenticated users to Minders threat model. However, a user will need to configure their own Minder settings to cause Minder to make Minder send a request to fetch the attestations. The user would need to know of a package whose attestations were configured in such a way that they would return a large response when fetching them. As such, the steps needed to carry out this attack would look as such: 1. The attacker adds a package to ghcr.io with attestations that can be fetched via the `orgs/$owner/attestations/$checksumref` GitHub endpoint. 2. The attacker registers on Minder and makes Minder fetch the attestations. 3. Minder fetches attestations and crashes thereby being denied of service.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Minder by Stacklok is an open source software supply chain security platform. Minder prior to version
    0.0.51 is vulnerable to a denial-of-service (DoS) attack which could allow an attacker to crash the Minder
    server and deny other users access to it. The root cause of the vulnerability is that Minders sigstore
    verifier reads an untrusted response entirely into memory without enforcing a limit on the response body.
    An attacker can exploit this by making Minder make a request to an attacker-controlled endpoint which
    returns a response with a large body which will crash the Minder server. Specifically, the point of
    failure is where Minder parses the response from the GitHub attestations endpoint in
    `getAttestationReply`. Here, Minder makes a request to the `orgs/$owner/attestations/$checksumref` GitHub
    endpoint (line 285) and then parses the response into the `AttestationReply` (line 295). The way Minder
    parses the response on line 295 makes it prone to DoS if the response is large enough. Essentially, the
    response needs to be larger than the machine has available memory. Version 0.0.51 contains a patch for
    this issue. The content that is hosted at the `orgs/$owner/attestations/$checksumref` GitHub attestation
    endpoint is controlled by users including unauthenticated users to Minders threat model. However, a user
    will need to configure their own Minder settings to cause Minder to make Minder send a request to fetch
    the attestations. The user would need to know of a package whose attestations were configured in such a
    way that they would return a large response when fetching them. As such, the steps needed to carry out
    this attack would look as such: 1. The attacker adds a package to ghcr.io with attestations that can be
    fetched via the `orgs/$owner/attestations/$checksumref` GitHub endpoint. 2. The attacker registers on
    Minder and makes Minder fetch the attestations. 3. Minder fetches attestations and crashes thereby being
    denied of service. (CVE-2024-35238)

ID	Name	Product	Family	Severity
412632	SCA: security update for github.com/stacklok/minder (GHSA-8fmj-33gw-g7pw)	Tenable Cloud Security	SCA Checks	medium
412632	SCA: security update for github.com/stacklok/minder (GHSA-8fmj-33gw-g7pw)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

Analytics

CVE-2024-35238

medium

Tenable Plugins

medium

medium