GHSA-jq35-85cj-fj4p

Source

https://github.com/advisories/GHSA-jq35-85cj-fj4p

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/10/GHSA-jq35-85cj-fj4p/GHSA-jq35-85cj-fj4p.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-jq35-85cj-fj4p

Related

Published

2023-10-30T15:25:44Z

Modified

2023-10-30T15:25:44Z

Summary

/sys/devices/virtual/powercap accessible by default to containers

Details

Intel's RAPL (Running Average Power Limit) feature, introduced by the Sandy Bridge microarchitecture, provides software insights into hardware energy consumption. To facilitate this, Intel introduced the powercap framework in Linux kernel 3.13, which reads values via relevant MSRs (model specific registers) and provides unprivileged userspace access via sysfs. As RAPL is an interface to access a hardware feature, it is only available when running on bare metal with the module compiled into the kernel.

By 2019, it was realized that in some cases unprivileged access to RAPL readings could be exploited as a power-based side-channel against security features including AES-NI (potentially inside a SGX enclave) and KASLR (kernel address space layout randomization). Also known as the PLATYPUS attack, Intel assigned CVE-2020-8694 and CVE-2020-8695, and AMD assigned CVE-2020-12912.

Several mitigations were applied; Intel reduced the sampling resolution via a microcode update, and the Linux kernel prevents access by non-root users since 5.10. However, this kernel-based mitigation does not apply to many container-based scenarios: * Unless using user namespaces, root inside a container has the same level of privilege as root outside the container, but with a slightly more narrow view of the system * sysfs is mounted inside containers read-only; however only read access is needed to carry out this attack on an unpatched CPU

While this is not a direct vulnerability in container runtimes, defense in depth and safe defaults are valuable and preferred, especially as this poses a risk to multi-tenant container environments running directly on affected hardware. This is provided by masking /sys/devices/virtual/powercap in the default mount configuration, and adding an additional set of rules to deny it in the default AppArmor profile.

While sysfs is not the only way to read from the RAPL subsystem, other ways of accessing it require additional capabilities such as CAP_SYS_RAWIO which is not available to containers by default, or perf paranoia level less than 1, which is a non-default kernel tunable.

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8694
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8695
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12912
https://platypusattack.com/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=949dd0104c496fa7c14991a23c03c62e44637e71
https://web.eece.maine.edu/~vweaver/projects/rapl/

Database specific

{
    "nvd_published_at": null,
    "cwe_ids": [],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2023-10-30T15:25:44Z"
}

References

Affected packages

Go / github.com/docker/docker

Package

Name: github.com/docker/docker; View open source insights on deps.dev
Purl: pkg:golang/github.com/docker/docker

Affected ranges

Type: SEMVER
Events: Introduced

24.0.0

Fixed

24.0.7

Go / github.com/docker/docker

Package

Name: github.com/docker/docker; View open source insights on deps.dev
Purl: pkg:golang/github.com/docker/docker

Affected ranges

Type: SEMVER
Events: Introduced

21.0.0

Fixed

23.0.8

Go / github.com/docker/docker

Package

Name: github.com/docker/docker; View open source insights on deps.dev
Purl: pkg:golang/github.com/docker/docker

Affected ranges

Type: SEMVER
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

20.10.27