CVE-2019-18888: Argument injection in a MimeTypeGuesser in Symfony

Quick answers

Is CVE-2019-18888 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2019-18888 being exploited in the wild.

How severe is CVE-2019-18888?

Low severity, with a CVSS score of 3.1, published 2 December 2019.

Which products and versions are affected?

symfony/http-foundation (Packagist) ECOSYSTEM:introduced=2.0.0,fixed=2.8.52; symfony/mime (Packagist) ECOSYSTEM:introduced=4.3.0,fixed=4.3.8; symfony/symfony (Packagist) ECOSYSTEM:introduced=2.0.0,fixed=2.8.52.

Is there a fix for CVE-2019-18888?

Yes. symfony/http-foundation (Packagist): upgrade to 2.8.52 or later; symfony/mime (Packagist): upgrade to 4.3.8 or later; symfony/symfony (Packagist): upgrade to 2.8.52 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Am I affected by CVE-2019-18888?

Check whether you run symfony/http-foundation (Packagist), symfony/mime (Packagist) or symfony/symfony (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

• symfony/http-foundation (Packagist): upgrade to 2.8.52 or later

  composer require symfony/http-foundation:^2.8.52

• symfony/mime (Packagist): upgrade to 4.3.8 or later

  composer require symfony/mime:^4.3.8

• symfony/symfony (Packagist): upgrade to 2.8.52 or later

  composer require symfony/symfony:^2.8.52

Affected products

• symfony/http-foundation (Packagist) ECOSYSTEM:introduced=2.0.0,fixed=2.8.52
• symfony/mime (Packagist) ECOSYSTEM:introduced=4.3.0,fixed=4.3.8
• symfony/symfony (Packagist) ECOSYSTEM:introduced=2.0.0,fixed=2.8.52

Identifiers

• CVE-2019-18888
• GHSA-xhh6-956q-4q69