Moodle 2.3.x before 2.3.1 uses only a client-side check for whether references are permitted in a file upload, which allows remote authenticated users to bypass intended alias (aka shortcut) restrictions via a client that omits this check.

The remote web server hosts Moodle, an open-source course management system.  Versions of Moodle 2.3.x prior to 2.3.1 are exposed to the following vulnerabilities :

 - A flaw exists that is triggered when an error occurs in the 'file_save_draft_area_files()' function in files where shortcuts or alias are not permitted.  This may allow an attacker to more easily compromise a user's system via uploading files that are not properly validated. (CVE-2012-3387)
 - A flaw exists that is triggered when an error occurs in the 'is_enrolled()' function in the 'lib/accesslib.php script' after a user record has been cached.  This may allow a remote attacker to bypass access restrictions. (CVE-2012-3388)
 - A flaw exists that allows a remote cross-site scripting (XSS) attack.  This flaw exists because the application does not validate input passed via multiple unspecified parameters in the LTI (External tool) module upon submission to the 'mod/lti/typessettings.php' script.  This may allow a user to create a specially crafted request that would execute arbitrary script code in a user's browser within the trust relationship between their browser and the server. (CVE-2012-3389)
 - A flaw exists that is triggered when the program fails to properly restrict access to files embedded by a block.  This may allow a remote attacker to bypass access restrictions and gain access to arbitrary files. (CVE-2012-3390)
 - A flaw exists that allows a remote cross-site scripting (XSS) attack.  This flaw exists because the application does not validate input passed via certain unspecified fields when administrating cohorts before returning it to the user.  This may allow a user to create a specially crafted request that would execute arbitrary script code in a user's browser within the trust relationship between their browser and the server. (CVE-2012-3396)
 - A flaw exists that may lead to an unauthorized information disclosure.  The issue is triggered when the Restrict Access conditions improperly overwrite group settings. This will display potentially sensitive group activities to a remote attacker. (CVE-2012-3397)

Latest upstreams to address security issues.

CVE-2012-3387 CVE-2012-3388 CVE-2012-3389 CVE-2012-3390 CVE-2012-3391 CVE-2012-3392 CVE-2012-3393 CVE-2012-3394 CVE-2012-3395 CVE-2012-3396 CVE-2012-3397 CVE-2012-3398

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
9406	Moodle 2.3.x < 2.3.1 Multiple Vulnerabilities	Nessus Network Monitor	CGI	low
61386	Fedora 17 : moodle-2.2.4-1.fc17 (2012-11039)	Nessus	Fedora Local Security Checks	medium
61385	Fedora 16 : moodle-2.0.10-1.fc16 (2012-11028)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2012-3387

medium

Tenable Plugins

low

medium

medium