CVE-2018-18021: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-6vp5-5gv4-mcqp
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CVSS 7.1
CWE-20
Published
Advisory Summary

CVE-2018-18021 is a HIGH (CVSS 7.1) security vulnerability vulnerability (CWE-20: Improper Input Validation) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.. Remediation is available in the latest vendor maintenance releases.

CVE-2018-18021 at a Glance

CVE Identifier CVE-2018-18021
GHSA Identifier GHSA-6vp5-5gv4-mcqp
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-20: Improper Input Validation
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.1

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

How to Fix CVE-2018-18021

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

Verify Direct and Transitive Dependencies

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

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2018-18021, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Software, 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

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

References

NVD — CVE-2018-18021 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-18021
Security Fix Commit FIX COMMIT
https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279
Security Fix Commit FIX COMMIT
https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d
access.redhat.com/errata/rhsa-2018:36... WEB
https://access.redhat.com/errata/RHSA-2018:3656
cdn.kernel.org/pub/linux/kernel/v4... WEB
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12
usn.ubuntu.com/3821-1 WEB
https://usn.ubuntu.com/3821-1
usn.ubuntu.com/3821-2 WEB
https://usn.ubuntu.com/3821-2
usn.ubuntu.com/3931-1 WEB
https://usn.ubuntu.com/3931-1
usn.ubuntu.com/3931-2 WEB
https://usn.ubuntu.com/3931-2
Software Security Information SECURITY
https://www.debian.org/security/2018/dsa-4313
Software Security Information SECURITY
https://www.openwall.com/lists/oss-security/2018/10/02/2
git.kernel.org/cgit/linux/kernel/g... WEB
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2a3f93459d689d990b3ecfbe782fec89b97d3279
git.kernel.org/cgit/linux/kernel/g... WEB
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d26c25a9d19b5976b319af528886f89cf455692d
Software Security Information SECURITY
http://www.securityfocus.com/bid/105550

Frequently Asked Questions

What is CVE-2018-18021?
CVE-2018-18021 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-20: Improper Input Validation.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2018-18021?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2018-18021?
CVE-2018-18021 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
What CWE is associated with CVE-2018-18021?
CVE-2018-18021 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2018-18021?
Run the dependency tree command: 'mvn dependency:tree'. 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 
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  "id" : "GHSA-6vp5-5gv4-mcqp",
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  "published" : "2022-05-14T01:14:00Z",
  "aliases" : [ "CVE-2018-18021" ],
  "details" : "arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
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    "url" : "http://www.securityfocus.com/bid/105550"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2018-10-07T06:29:00Z"
  }
}