CVE-2019-12831
Last modified
CVE-2019-12831 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 1.49% chance of exploitation in the next 30 days.
Description
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mybb | Mybb | < 1.8.21 |
References
- https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/Release Notes, Vendor Advisory
- https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/Exploit, Vendor Advisory
- https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/Release Notes, Vendor Advisory
- https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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