CVE-2019-11328: Github.com/sylabs/singularity Remote Code Execution Vulnerability

HIGH
Advisory Identifier: GHSA-557g-r22w-9wvx
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CVSS 8.8
CWE-732 CWE-269
Published
Advisory Summary

CVE-2019-11328 is a HIGH (CVSS 8.8) remote code execution vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affecting Github.com/sylabs/singularity libraries in the Go ecosystem. The issue involves incorrect permission assignment for critical resource in singularity. Remediation is available by upgrading affected packages to version 3.2.0.

CVE-2019-11328 at a Glance

CVE Identifier CVE-2019-11328
GHSA Identifier GHSA-557g-r22w-9wvx
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-732: Incorrect Permission Assignment for Critical Resource
Affected Product Github.com/sylabs/singularity
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2019-11328

To remediate this vulnerability, upgrade all affected Github.com/sylabs/singularity dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/sylabs/singularity fixed: 3.2.0 
Upgrade github.com/sylabs/singularity to 3.2.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/sylabs/singularity

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-11328, inspect your project dependencies for Github.com/sylabs/singularity:

inspect dependencies for github.com/sylabs/singularity

Analyze the terminal output to locate any version of Github.com/sylabs/singularity in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.2.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-732: Incorrect Permission Assignment for Critical Resource, where the product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. In Github.com/sylabs/singularity, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in Singularity 3.1.0 to 3.2.0-rc2, a malicious user with local/network access to the host system (e.g. ssh) could exploit this vulnerability due to insecure permissions allowing a user to edit files within `/run/singularity/instances/sing/<user>/<instance>`. The manipulation of those files can change the behavior of the starter-suid program when instances are joined resulting in potential privilege escalation on the host.

CVE-2019-11328 Affected Github.com/sylabs/singularity Versions

1 component(s)
Fixed Versions:
3.2.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/sylabs/singularity
golang/github.com/sylabs/singularity
Go
≥ 3.1.0
< 3.2.0
3.2.0

References

NVD — CVE-2019-11328 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-11328
Security Fix Commit FIX COMMIT
https://github.com/sylabs/singularity/commit/618c9d56802399adb329c23ea2b70598eaff4a31
Github.com/sylabs/singularity Release RELEASE
https://github.com/sylabs/singularity/releases/tag/v3.2.0
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5O3TPL5OOTIZEI4H6IQBCCISBARJ6WL3
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LIHV7DSEVTB5SUPEZ2UXGS3Q6WMEQSO2
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LNU5BUHFOTYUZVHFUSX2VG4S3RCPUEMA
Github.com/sylabs/singularity Security Information SECURITY
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00028.html
Github.com/sylabs/singularity Security Information SECURITY
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00059.html
Github.com/sylabs/singularity Security Information SECURITY
http://www.openwall.com/lists/oss-security/2019/05/16/1
Github.com/sylabs/singularity Security Information SECURITY
http://www.securityfocus.com/bid/108360

Frequently Asked Questions

What is CVE-2019-11328?
CVE-2019-11328 is a security vulnerability in Github.com/sylabs/singularity involving Incorrect Permission Assignment for Critical Resource in Singularity under CWE-732: Incorrect Permission Assignment for Critical Resource.
Which Github.com/sylabs/singularity versions are affected?
Affected versions include releases prior to 3.2.0 across affected packages: github.com/sylabs/singularity.
What version fixes CVE-2019-11328?
Upgrading to 3.2.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/sylabs/singularity affected?
Yes, github.com/sylabs/singularity is affected in releases prior to 3.2.0. Upgrade your dependency to 3.2.0 or later.
What is the CVSS score of CVE-2019-11328?
CVE-2019-11328 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-11328?
CVE-2019-11328 is classified under CWE-732: Incorrect Permission Assignment for Critical Resource (The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.).
How can I check Go dependencies for CVE-2019-11328?
Run the dependency tree command: 'inspect dependencies for github.com/sylabs/singularity'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-557g-r22w-9wvx",
  "modified" : "2023-02-28T16:47:09Z",
  "published" : "2021-12-20T18:25:33Z",
  "aliases" : [ "CVE-2019-11328" ],
  "summary" : "Incorrect Permission Assignment for Critical Resource in Singularity",
  "details" : "An issue was discovered in Singularity 3.1.0 to 3.2.0-rc2, a malicious user with local/network access to the host system (e.g. ssh) could exploit this vulnerability due to insecure permissions allowing a user to edit files within `/run/singularity/instances/sing/<user>/<instance>`. The manipulation of those files can change the behavior of the starter-suid program when instances are joined resulting in potential privilege escalation on the host.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/sylabs/singularity"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1.0"
      }, {
        "fixed" : "3.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-11328"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sylabs/singularity/commit/618c9d56802399adb329c23ea2b70598eaff4a31"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sylabs/singularity/releases/tag/v3.2.0"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5O3TPL5OOTIZEI4H6IQBCCISBARJ6WL3"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LIHV7DSEVTB5SUPEZ2UXGS3Q6WMEQSO2"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LNU5BUHFOTYUZVHFUSX2VG4S3RCPUEMA"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00028.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00059.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2019/05/16/1"
  }, {
    "type" : "WEB",
    "url" : "http://www.securityfocus.com/bid/108360"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-269", "CWE-732" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-17T15:50:05Z",
    "nvd_published_at" : "2019-05-14T21:29:00Z"
  }
}