CVE-2025-27612 – libcontainer

Package

Manager: cargo
Name: libcontainer
Vulnerable Version: >=0 <0.5.3

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

EPSS: 0.00057 pctl0.17843

Details

Libcontainer is affected by capabilities elevation similar to GHSA-f3fp-gc8g-vw66 ### Impact In libcontainer, while creating a tenant container, the tenant builder accepts a list of capabilities to be added in the spec of tenant container. Code can be seen [here](https://github.com/youki-dev/youki/blob/9e63fa4da1672a78ca45100f3059a732784a5174/crates/libcontainer/src/container/tenant_builder.rs#L408) . The logic here adds the given capabilities to all capabilities of main container if present in spec, otherwise simply set provided capabilities as capabilities of the tenant container. However, GHSA-f3fp-gc8g-vw66 was opened on runc mentioning that setting inherited caps in any case for tenant container can lead to elevation of capabilities. For this, they added a fix [here](https://github.com/opencontainers/runc/blob/986451c24e17c8d4be3c454f60b1f7be4af3e8b4/exec.go#L234-L242) where they never set new inherited caps on tenant, and set ambient caps only if original container had inherited caps. Similarly crun never sets inherited caps as can be seen [here](https://github.com/containers/crun/blob/3ec6298abd79e144fbf3fa6db90793ff4c0516f9/src/exec.c#L319). > [!NOTE] This does not affect youki binary itself, as the exec implementation is partially broken and does not pass on the user-provided caps to tenant containers, this is only applicable if you are using libcontainer directly and using the tenant builder. ### Workarounds - Do not pass any user-provided capabilities to the tenant builder, in which case no capabilities will be set on tenant. - Alternatively you can verify the capabilities of original container and filter the user passed capabilities before setting them on tenant. ### References - https://github.com/opencontainers/runc/security/advisories/GHSA-f3fp-gc8g-vw66 - https://man7.org/linux/man-pages/man7/capabilities.7.html

Metadata

Created: 2025-03-21T15:18:28Z
Modified: 2025-03-21T15:42:03Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/03/GHSA-5w4j-f78p-4wh9/GHSA-5w4j-f78p-4wh9.json
CWE IDs: ["CWE-276"]
Alternative ID: GHSA-5w4j-f78p-4wh9
Finding: F159
Auto approve: 1