Upstream information
Description
Cosign provides container signing, verification, and storage in an OCI registry for the sigstore project. Prior to version 1.5.2, Cosign can be manipulated to claim that an entry for a signature exists in the Rekor transparency log even if it doesn't. This requires the attacker to have pull and push permissions for the signature in OCI. This can happen with both standard signing with a keypair and "keyless signing" with Fulcio. If an attacker has access to the signature in OCI, they can manipulate cosign into believing the entry was stored in Rekor even though it wasn't. The vulnerability has been patched in v1.5.2 of Cosign. The `signature` in the `signedEntryTimestamp` provided by Rekor is now compared to the `signature` that is being verified. If these don't match, then an error is returned. If a valid bundle is copied to a different signature, verification should fail. Cosign output now only informs the user that certificates were verified if a certificate was in fact verified. There is currently no known workaround.SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having moderate severity.
| National Vulnerability Database | |
|---|---|
| Base Score | 2.1 |
| Vector | AV:L/AC:L/Au:N/C:N/I:P/A:N |
| Access Vector | Local |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | Partial |
| Availability Impact | None |
| National Vulnerability Database | SUSE | |
|---|---|---|
| Base Score | 3.3 | 6.5 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| Attack Vector | Local | Network |
| Attack Complexity | Low | Low |
| Privileges Required | Low | Low |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | Low | High |
| Availability Impact | None | None |
| CVSSv3 Version | 3.1 | 3.1 |
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 Linux Enterprise Module for Basesystem 15 SP4 GA cosign-1.5.2-150400.1.7 |
| 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 Linux Enterprise Module for Basesystem 15 SP5 GA cosign-1.12.0-150400.3.6.1 |
| openSUSE Tumbleweed |
| Patchnames: openSUSE Tumbleweed GA cosign-1.5.2-1.1 |
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 | Already fixed |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | cosign | Already fixed |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | cosign | Already fixed |
| SUSE Linux Enterprise Server 15 SP5 | cosign | Already fixed |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | cosign | Already fixed |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | cosign | Already fixed |
| SUSE Manager Proxy 4.3 | cosign | Already fixed |
| SUSE Manager Retail Branch Server 4.3 | cosign | Already fixed |
| SUSE Manager Server 4.3 | cosign | Already fixed |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP4 | cosign | Already fixed |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | cosign | Already fixed |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | cosign | Already fixed |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | cosign | Already fixed |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | cosign | Already fixed |
| SUSE Linux Enterprise Server 15 SP4 | cosign | Already fixed |
| SUSE Linux Enterprise Server 15 SP4-LTSS | cosign | Already fixed |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Real Time 15 SP4 | cosign | Already fixed |
SUSE Timeline for this CVE
CVE page created: Sat Feb 19 05:00:23 2022CVE page last modified: Thu Feb 22 17:20:22 2024