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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2019-06-15T17:05:08

Updated: 2024-08-04T23:32:55.221Z

Reserved: 2019-06-15T00:00:00

Link: CVE-2019-12831

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2019-06-15T18:29:00.283

Modified: 2019-06-17T19:01:45.343

Link: CVE-2019-12831

cve-icon Redhat

No data.