CVE-2023-46737 (Low) detected in github.com/sigstore/cosign-v1.0.1

[mend-bolt-for-github]

CVE-2023-46737 - Low Severity Vulnerability

Vulnerable Library - github.com/sigstore/cosign-v1.0.1

Container Signing

Library home page: https://proxy.golang.org/github.com/sigstore/cosign/@v/v1.0.1.zip

Path to dependency file: /go.mod

Path to vulnerable library: /go.mod

Dependency Hierarchy:

• ❌ github.com/sigstore/cosign-v1.0.1 (Vulnerable Library)

Found in HEAD commit: df1f7d3f67826e841793324e4796be4fbd91c00f

Found in base branch: main

Vulnerability Details

Cosign is a sigstore signing tool for OCI containers. Cosign is susceptible to a denial of service by an attacker controlled registry. An attacker who controls a remote registry can return a high number of attestations and/or signatures to Cosign and cause Cosign to enter a long loop resulting in an endless data attack. The root cause is that Cosign loops through all attestations fetched from the remote registry in pkg/cosign.FetchAttestations. The attacker needs to compromise the registry or make a request to a registry they control. When doing so, the attacker must return a high number of attestations in the response to Cosign. The result will be that the attacker can cause Cosign to go into a long or infinite loop that will prevent other users from verifying their data. In Kyvernos case, an attacker whose privileges are limited to making requests to the cluster can make a request with an image reference to their own registry, trigger the infinite loop and deny other users from completing their admission requests. Alternatively, the attacker can obtain control of the registry used by an organization and return a high number of attestations instead the expected number of attestations. The issue can be mitigated rather simply by setting a limit to the limit of attestations that Cosign will loop through. The limit does not need to be high to be within the vast majority of use cases and still prevent the endless data attack. This issue has been patched in version 2.2.1 and users are advised to upgrade.

Publish Date: 2023-11-07

URL: CVE-2023-46737

CVSS 3 Score Details (3.1)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-vfp6-jrw2-99g9

Release Date: 2023-11-07

Fix Resolution: v2.2.1

---

Step up your Open Source Security Game with Mend here