CVE-2022-25327: Github.com/google/fscrypt Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-8vwm-8vj8-rqjf
Share
CVSS 5.5
CWE-276
Published
Advisory Summary

CVE-2022-25327 is a MODERATE (CVSS 5.5) denial of service vulnerability (CWE-276: Incorrect Default Permissions) affecting Github.com/google/fscrypt libraries in the Go ecosystem. The issue involves user login denial of service in github.com/google/fscrypt. Remediation is available by upgrading affected packages to version 0.3.3.

CVE-2022-25327 at a Glance

CVE Identifier CVE-2022-25327
GHSA Identifier GHSA-8vwm-8vj8-rqjf
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-276: Incorrect Default Permissions
Affected Product Github.com/google/fscrypt
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 5.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

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

How to Fix CVE-2022-25327

To remediate this vulnerability, upgrade all affected Github.com/google/fscrypt 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/google/fscrypt fixed: 0.3.3 
Upgrade github.com/google/fscrypt to 0.3.3
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/google/fscrypt

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-25327, inspect your project dependencies for Github.com/google/fscrypt:

inspect dependencies for github.com/google/fscrypt

Analyze the terminal output to locate any version of Github.com/google/fscrypt in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.3), 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-276: Incorrect Default Permissions, where during installation, installed file permissions are set to allow anyone to modify those files. In Github.com/google/fscrypt, 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

The PAM module for fscrypt doesn't adequately validate fscrypt metadata files, allowing users to create malicious metadata files that prevent other users from logging in. A local user can cause a denial of service by creating a fscrypt metadata file that prevents other users from logging into the system. We recommend upgrading to version 0.3.3 or above

CVE-2022-25327 Affected Github.com/google/fscrypt Versions

1 component(s)
Fixed Versions:
0.3.3
Product / Package Ecosystem Affected Versions Fixed Version
github.com/google/fscrypt
golang/github.com/google/fscrypt
Go
< 0.3.3
0.3.3

References

NVD — CVE-2022-25327 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-25327
Github.com/google/fscrypt Source Repository REPOSITORY
https://github.com/google/fscrypt/pull/346
Security Fix Commit FIX COMMIT
https://github.com/google/fscrypt/commit/91aa3ebf42032ca783c41f9ec25d885875f66ddb
Github.com/google/fscrypt Source Repository REPOSITORY
https://github.com/google/fscrypt

Frequently Asked Questions

What is CVE-2022-25327?
CVE-2022-25327 is a security vulnerability in Github.com/google/fscrypt involving User login denial of service in github.com/google/fscrypt under CWE-276: Incorrect Default Permissions.
Which Github.com/google/fscrypt versions are affected?
Affected versions include releases prior to 0.3.3 across affected packages: github.com/google/fscrypt.
What version fixes CVE-2022-25327?
Upgrading to 0.3.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/google/fscrypt affected?
Yes, github.com/google/fscrypt is affected in releases prior to 0.3.3. Upgrade your dependency to 0.3.3 or later.
What is the CVSS score of CVE-2022-25327?
CVE-2022-25327 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-25327?
CVE-2022-25327 is classified under CWE-276: Incorrect Default Permissions (During installation, installed file permissions are set to allow anyone to modify those files.).
How can I check Go dependencies for CVE-2022-25327?
Run the dependency tree command: 'inspect dependencies for github.com/google/fscrypt'. 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-8vwm-8vj8-rqjf",
  "modified" : "2022-03-01T19:27:43Z",
  "published" : "2022-02-26T00:00:44Z",
  "aliases" : [ "CVE-2022-25327" ],
  "summary" : "User login denial of service in github.com/google/fscrypt",
  "details" : "The PAM module for fscrypt doesn't adequately validate fscrypt metadata files, allowing users to create malicious metadata files that prevent other users from logging in. A local user can cause a denial of service by creating a fscrypt metadata file that prevents other users from logging into the system. We recommend upgrading to version 0.3.3 or above",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/google/fscrypt"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-25327"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/google/fscrypt/pull/346"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/google/fscrypt/commit/91aa3ebf42032ca783c41f9ec25d885875f66ddb"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/google/fscrypt"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-276" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-03-01T19:27:43Z",
    "nvd_published_at" : "2022-02-25T11:15:00Z"
  }
}