7.2
CWE
20
Advisory Published
Updated

CVE-2019-12831: Input Validation

First published: Sat Jun 15 2019(Updated: )

In MyBB before 1.8.21, an attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of strings that are too long for a database column) to create a PHP shell in the cache directory of a targeted forum via a crafted XML import, as demonstrated by truncation of aaaaaaaaaaaaaaaaaaaaaaaaaa.php.css to aaaaaaaaaaaaaaaaaaaaaaaaaa.php with a 30-character limit, aka theme import stylesheet name RCE.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Mybb Mybb<1.8.21

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Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is CVE-2019-12831.

  • What is the severity of CVE-2019-12831?

    The severity of CVE-2019-12831 is high with a severity value of 7.2.

  • How does CVE-2019-12831 affect MyBB?

    CVE-2019-12831 affects MyBB versions prior to 1.8.21.

  • How can an attacker exploit CVE-2019-12831?

    An attacker can exploit CVE-2019-12831 by abusing a default behavior of MySQL to create a PHP shell in the cache directory of a targeted forum via a crafted XML import.

  • How can CVE-2019-12831 be fixed?

    CVE-2019-12831 can be fixed by upgrading MyBB to version 1.8.21 or later.

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