Moodle 3.6.3 ZIP File repository_ajax.php?action=upload code injection

Summaryinfo

A vulnerability described as critical has been identified in Moodle 3.6.3. The affected element is an unknown function of the file repository/repository_ajax.php?action=upload of the component ZIP File Handler. Executing a manipulation can lead to code injection. This vulnerability is tracked as CVE-2019-11631. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability classified as critical was found in Moodle 3.6.3 (Learning Management Software). This vulnerability affects an unknown code block of the file repository/repository_ajax.php?action=upload of the component ZIP File Handler. The manipulation with an unknown input leads to a code injection vulnerability. The CWE definition for the vulnerability is CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Moodle 3.6.3 allows remote authenticated administrators to execute arbitrary PHP code via a ZIP archive, containing a theme_*.php file, to repository/repository_ajax.php?action=upload and admin/tool/installaddon/index.php.

The bug was discovered 04/30/2019. The weakness was disclosed 05/01/2019. This vulnerability was named CVE-2019-11631 since 04/30/2019. The attack can be initiated remotely. The requirement for exploitation is a single authentication. Technical details and also a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1059.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (46775). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Learning Management Software

Name

• Moodle

Version

• 3.6.3

License

• open-source

Website

• Product: https://moodle.org/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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