Upstream information
Description
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.SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having low severity.
| National Vulnerability Database | SUSE | |
|---|---|---|
| Base Score | 5.3 | 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L |
| Attack Vector | Network | Network |
| Attack Complexity | Low | High |
| Privileges Required | None | None |
| User Interaction | None | Required |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | None | None |
| Availability Impact | Low | Low |
| CVSSv3 Version | 3.1 | 3.1 |
SUSE Security Advisories:
- SUSE-SU-2023:4870-1, published Thu Dec 14 16:30:21 UTC 2023
List of released packages
| Product(s) | Fixed package version(s) | References |
|---|---|---|
| SUSE Linux Enterprise Desktop 15 SP4 SUSE Linux Enterprise High Performance Computing 15 SP4 SUSE Linux Enterprise Module for Basesystem 15 SP4 SUSE Linux Enterprise Server 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Manager Proxy 4.3 SUSE Manager Retail Branch Server 4.3 SUSE Manager Server 4.3 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-SP4-2023-4870 |
| SUSE Linux Enterprise Desktop 15 SP5 SUSE Linux Enterprise High Performance Computing 15 SP5 SUSE Linux Enterprise Module for Basesystem 15 SP5 SUSE Linux Enterprise Server 15 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP5 |
| Patchnames: SUSE-SLE-Module-Basesystem-15-SP5-2023-4870 |
| SUSE Linux Enterprise Desktop 15 SP6 SUSE Linux Enterprise High Performance Computing 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server for SAP Applications 15 SP6 |
| Patchnames: SUSE Linux Enterprise Module for Basesystem 15 SP6 GA cosign-2.2.3-150400.3.17.1 |
| openSUSE Leap 15.4 |
| Patchnames: openSUSE-SLE-15.4-2023-4870 |
| openSUSE Leap 15.5 |
| Patchnames: openSUSE-SLE-15.5-2023-4870 |
| openSUSE Tumbleweed |
| Patchnames: openSUSE Tumbleweed GA cosign-2.2.1-1.1 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP5 | cosign | Released |
| SUSE Linux Enterprise Desktop 15 SP6 | cosign | Released |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | cosign | Released |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | cosign | Released |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | cosign | Released |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | cosign | Released |
| SUSE Linux Enterprise Server 15 SP5 | cosign | Released |
| SUSE Linux Enterprise Server 15 SP6 | cosign | Released |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | cosign | Released |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | cosign | Released |
| SUSE Manager Proxy 4.3 | cosign | Released |
| SUSE Manager Retail Branch Server 4.3 | cosign | Released |
| SUSE Manager Server 4.3 | cosign | Released |
| openSUSE Leap 15.5 | cosign | Released |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP4 | cosign | Released |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | cosign | Released |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | cosign | Released |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | cosign | Released |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | cosign | Released |
| SUSE Linux Enterprise Server 15 SP4 | cosign | Released |
| SUSE Linux Enterprise Server 15 SP4-LTSS | cosign | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | cosign | Released |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Real Time 15 SP4 | cosign | Released |
| openSUSE Leap 15.4 | cosign | Released |
SUSE Timeline for this CVE
CVE page created: Tue Nov 7 14:52:04 2023CVE page last modified: Wed Apr 24 13:12:32 2024