ghsa-jv9c-w74q-6762
Vulnerability from github
Impact
Insecure permissions on temporary directories used in explicit and implicit container build operations.
When a Singularity command that results in a container build operation is executed, it is possible for a user with access to the system to read the contents of the image during the build. Additionally, if the image contains a world-writable file or directory, it is possible for a user to inject arbitrary content into the running build, which in certain circumstances may enable arbitrary code execution during the build and/or when the built container is run.
Patches
This issue is addressed in Singularity 3.6.3.
All users are advised to upgrade to 3.6.3.
Workarounds
The issue is mitigated if TMPDIR is set to a location that is only accessible to the user, as any subdirectories directly under TMPDIR cannot then be accessed by others. However, this is difficult to enforce so it is not recommended to rely on this as a mitigation.
For more information
General questions about the impact of the advisory / changes made in the 3.6.0 release can be asked in the:
Any sensitive security concerns should be directed to: security@sylabs.io
See our Security Policy here: https://sylabs.io/security-policy
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/sylabs/singularity"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2020-25040"
],
"database_specific": {
"cwe_ids": [
"CWE-668",
"CWE-732"
],
"github_reviewed": true,
"github_reviewed_at": "2021-05-24T16:53:16Z",
"nvd_published_at": "2020-09-16T18:15:00Z",
"severity": "HIGH"
},
"details": "### Impact\n\nInsecure permissions on temporary directories used in explicit and implicit container build operations.\n\nWhen a Singularity command that results in a container build operation is executed, it is possible for a user with access to the system to read the contents of the image during the build. Additionally, if the image contains a world-writable file or directory, it is possible for a user to inject arbitrary content into the running build, which in certain circumstances may enable arbitrary code execution during the build and/or when the built container is run.\n\n### Patches\n\nThis issue is addressed in Singularity 3.6.3.\n\nAll users are advised to upgrade to 3.6.3.\n\n### Workarounds\n\nThe issue is mitigated if `TMPDIR` is set to a location that is only accessible to the user, as any subdirectories directly under `TMPDIR` cannot then be accessed by others. However, this is difficult to enforce so it is not recommended to rely on this as a mitigation.\n\n### For more information\n\nGeneral questions about the impact of the advisory / changes made in the 3.6.0 release can be asked in the:\n\n* [Singularity Slack Channel](https://bit.ly/2m0g3lX)\n* [Singularity Mailing List](https://groups.google.com/a/lbl.gov/forum/??sdf%7Csort:date#!forum/singularity)\n\nAny sensitive security concerns should be directed to: security@sylabs.io\n\nSee our Security Policy here: https://sylabs.io/security-policy",
"id": "GHSA-jv9c-w74q-6762",
"modified": "2021-05-24T16:53:16Z",
"published": "2021-05-24T16:56:23Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/hpcng/singularity/security/advisories/GHSA-jv9c-w74q-6762"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25040"
},
{
"type": "WEB",
"url": "https://medium.com/sylabs"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00070.html"
},
{
"type": "WEB",
"url": "http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00088.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Insecure permissions on build temporary rootfs in Singularity"
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.