CVE-2019-18888: Symfony/http foundation Argument Injection Vulnerability

HIGH
Advisory Identifier: GHSA-xhh6-956q-4q69
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CVSS 7.5
CWE-88 CWE-20
Published
Advisory Summary

CVE-2019-18888 is a HIGH (CVSS 7.5) argument injection vulnerability (CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')) affecting Symfony/http foundation libraries in the Packagist ecosystem. The issue involves argument injection in a mimetypeguesser in symfony. Remediation is available by upgrading affected packages to version 2.8.52, 3.4.35, 4.2.12, 4.3.8.

CVE-2019-18888 at a Glance

CVE Identifier CVE-2019-18888
GHSA Identifier GHSA-xhh6-956q-4q69
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
Affected Product Symfony/http foundation
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix CVE-2019-18888

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

symfony/http-foundation fixed: 2.8.52 
Upgrade symfony/http-foundation to 2.8.52
symfony/http-foundation fixed: 3.4.35 
Upgrade symfony/http-foundation to 3.4.35
symfony/http-foundation fixed: 4.2.12 
Upgrade symfony/http-foundation to 4.2.12
symfony/http-foundation fixed: 4.3.8 
Upgrade symfony/http-foundation to 4.3.8
symfony/mime fixed: 4.3.8 
Upgrade symfony/mime to 4.3.8
symfony/symfony fixed: 2.8.52 
Upgrade symfony/symfony to 2.8.52
symfony/symfony fixed: 3.4.35 
Upgrade symfony/symfony to 3.4.35
symfony/symfony fixed: 4.2.12 
Upgrade symfony/symfony to 4.2.12
symfony/symfony fixed: 4.3.8 
Upgrade symfony/symfony to 4.3.8
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 symfony/http-foundation

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-18888, inspect your project dependencies for Symfony/http foundation:

inspect dependencies for symfony/http-foundation

Analyze the terminal output to locate any version of Symfony/http foundation in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.8.52), 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-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection'), where the product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. In Symfony/http foundation, 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 Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. If an application passes unvalidated user input as the file for which MIME type validation should occur, then arbitrary arguments are passed to the underlying file command. This is related to symfony/http-foundation (and symfony/mime in 4.3.x).

CVE-2019-18888 Affected Symfony/http foundation Versions

9 component(s)
Fixed Versions:
2.8.523.4.354.2.124.3.8
Product / Package Ecosystem Affected Versions Fixed Version
symfony/http-foundation
 Packagist
≥ 2.0.0
< 2.8.52
2.8.52
symfony/http-foundation
 Packagist
≥ 3.0.0
< 3.4.35
3.4.35
symfony/http-foundation
 Packagist
≥ 4.0.0
< 4.2.12
4.2.12
symfony/http-foundation
 Packagist
≥ 4.3.0
< 4.3.8
4.3.8
symfony/mime
 Packagist
≥ 4.3.0
< 4.3.8
4.3.8
symfony/symfony
 Packagist
≥ 2.0.0
< 2.8.52
2.8.52
symfony/symfony
 Packagist
≥ 3.0.0
< 3.4.35
3.4.35
symfony/symfony
 Packagist
≥ 4.0.0
< 4.2.12
4.2.12
symfony/symfony
 Packagist
≥ 4.3.0
< 4.3.8
4.3.8

References

NVD — CVE-2019-18888 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-18888
Symfony/http foundation Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2019-18888.yaml
Symfony/http foundation Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mime/CVE-2019-18888.yaml
Symfony/http foundation Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18888.yaml
Symfony/http foundation Release RELEASE
https://github.com/symfony/symfony/releases/tag/v4.3.8
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX
symfony.com/blog/symfony-4-3-8-... WEB
https://symfony.com/blog/symfony-4-3-8-released
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ
symfony.com/blog/cve-2019-18888... WEB
https://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesser
symfony.com/cve-2019-18888 WEB
https://symfony.com/cve-2019-18888

Frequently Asked Questions

What is CVE-2019-18888?
CVE-2019-18888 is a security vulnerability in Symfony/http foundation involving Argument injection in a MimeTypeGuesser in Symfony under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection').
Which Symfony/http foundation versions are affected?
Affected versions include releases prior to 2.8.52, 3.4.35, 4.2.12, 4.3.8 across affected packages: symfony/http-foundation, symfony/mime, symfony/symfony.
What version fixes CVE-2019-18888?
Upgrading to 2.8.52, 3.4.35, 4.2.12, 4.3.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is symfony/http-foundation affected?
Yes, symfony/http-foundation is affected in releases prior to 2.8.52, 3.4.35, 4.2.12, 4.3.8. Upgrade your dependency to 2.8.52, 3.4.35, 4.2.12, 4.3.8 or later.
Is symfony/mime affected?
Yes, symfony/mime is affected in releases prior to 4.3.8. Upgrade your dependency to 4.3.8 or later.
What is the CVSS score of CVE-2019-18888?
CVE-2019-18888 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2019-18888?
CVE-2019-18888 is classified under CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') (The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.).
How can I check Packagist dependencies for CVE-2019-18888?
Run the dependency tree command: 'inspect dependencies for symfony/http-foundation'. 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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  "schema_version" : "1.4.0",
  "id" : "GHSA-xhh6-956q-4q69",
  "modified" : "2021-07-28T16:28:00Z",
  "published" : "2019-12-02T18:08:19Z",
  "aliases" : [ "CVE-2019-18888" ],
  "summary" : "Argument injection in a MimeTypeGuesser in Symfony",
  "details" : "An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. If an application passes unvalidated user input as the file for which MIME type validation should occur, then arbitrary arguments are passed to the underlying file command. This is related to symfony/http-foundation (and symfony/mime in 4.3.x).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
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  "references" : [ {
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  }, {
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    "url" : "https://github.com/symfony/symfony/releases/tag/v4.3.8"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX"
  }, {
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    "type" : "WEB",
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  }, {
    "type" : "WEB",
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  }, {
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  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesser"
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    "url" : "https://symfony.com/blog/symfony-4-3-8-released"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/cve-2019-18888"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20", "CWE-88" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-12-01T19:46:13Z",
    "nvd_published_at" : "2019-11-21T23:15:00Z"
  }
}