filter/mediaplugin/filter.php in Moodle through 2.5.9, 2.6.x before 2.6.7, 2.7.x before 2.7.4, and 2.8.x before 2.8.2 allows remote authenticated users to cause a denial of service (CPU consumption or partial outage) via a crafted string that is matched against an improper regular expression.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - filter/mediaplugin/filter.php in Moodle through 2.5.9, 2.6.x before 2.6.7, 2.7.x before 2.7.4, and 2.8.x
    before 2.8.2 allows remote authenticated users to cause a denial of service (CPU consumption or partial
    outage) via a crafted string that is matched against an improper regular expression. (CVE-2015-0217)

The remote web server hosts Moodle, an open-source course management system. Versions of Moodle 2.6.x prior to 2.6.7, 2.7.x prior to 2.7.4, 2.8.x prior to 2.8.2, and all previous releases are exposed to the following vulnerabilities :

  - An access bypass flaw affects the 'mod/lti/ajax.php' script related to missing capability checks. This may allow a remote attacker to search the list of registered tools. (MSA-15-0001 / CVE-2015-0211)

  - A stored cross-site scripting (XSS) vulnerability in the Course Summary section. Specifically, this affects the course request pending approval page, 'course/pending.php', because it does not sanitize user-supplied input before displaying it to the course manager. (MSA-15-0002 / CVE-2015-0212)

  - A cross-site request forgery (CSRF) flaw exists as HTTP requests to the Glossary module do not require multiple steps, explicit confirmation, or a unique token when performing certain sensitive actions. By tricking a user into following a specially crafted link, a context-dependent attacker can leverage this vulnerability, causing the victim to edit categories unknowingly. (MSA-15-0003 / CVE-2015-0213)

  - An information disclosure vulnerability affects the 'message/externallib.php' script related to missing checks on whether messaging is disabled. This may allow a remote attacker to access messaging-related functions like people search to obtain sensitive information. (MSA-12-0004 / CVE-2015-0214)

  - An information disclosure vulnerability affects the 'calendar/externallib.php' script. Through web-services it was possible to get information about calendar events which users did not have permission to view. (MSA-15-0005 / CVE-2015-0215)

  - A denial-of-service vulnerability as a result of using a non-optimal regular expression. Specifically, this issue affects the multimedia filter. Attackers can exploit this issue to crash the affected application, denying service to legitimate users. (MSA-15-0007 / CVE-2015-0217)

The following security notifications have now been made public :

====================================================================== ======== MSA-15-0001: Insufficient access check in LTI module

Description: Absence of capability check in AJAX backend script could allow any enrolled user to search the list of registered tools Issue summary: mod/lti/ajax.php security problems Severity/Risk: Minor Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Petr Skoda Issue no.: MDL-47920 CVE identifier:
CVE-2015-0211 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 47920

====================================================================== ======== MSA-15-0002: XSS vulnerability in course request pending approval page

Description: Course summary on course request pending approval page was displayed to the manager unescaped and could be used for XSS attack Issue summary: XSS in course request pending approval page (Privilege Escalation?) Severity/Risk: Serious Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Skylar Kelty Issue no.: MDL-48368 Workaround: Grant permission moodle/course:request only to trusted users CVE identifier: CVE-2015-0212 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 48368

====================================================================== ======== MSA-15-0003: CSRF possible in Glossary module

Description: Two files in the Glossary module lacked a session key check potentially allowing cross-site request forgery Issue summary:
Multiple CSRF in mod glossary Severity/Risk: Serious Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Ankit Agarwal Issue no.: MDL-48106 CVE identifier: CVE-2015-0213 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 48106

====================================================================== ======== MSA-15-0004: Information leak through messaging functions in web-services

Description: Through web-services it was possible to access messaging-related functions such as people search even if messaging is disabled on the site Issue summary: Messages external functions doesn't check if messaging is enabled Severity/Risk: Minor Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Juan Leyva Issue no.: MDL-48329 Workaround: Disable web services or disable individual message-related functions CVE identifier:
CVE-2015-0214 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 48329

====================================================================== ======== MSA-15-0005: Insufficient access check in calendar functions in web-services

Description: Through web-services it was possible to get information about calendar events which user did not have enough permissions to see Issue summary: calendar/externallib.php lacks self::validate_context($context); Severity/Risk: Minor Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Petr Skoda Issue no.: MDL-48017 CVE identifier: CVE-2015-0215 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 48017

====================================================================== ======== MSA-15-0006: Capability to grade Lesson module is missing XSS bitmask

Description: Users with capability to grade in Lesson module were not reported as users with XSS risk but their feedback was displayed without cleaning Issue summary: mod/lesson:grade capability missing RISK_XSS but essay feedback is displayed with noclean=true Severity/Risk: Minor Versions affected: 2.8 to 2.8.1 Versions fixed:
2.8.2 Reported by: Damyon Wiese Issue no.: MDL-48034 CVE identifier:
CVE-2015-0216 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 48034

====================================================================== ======== MSA-15-0007: ReDoS possible in the multimedia filter

Description: Not optimal regular expression in the filter could be exploited to create extra server load or make particular page unavailable Issue summary: ReDOS in the multimedia filter Severity/Risk: Serious Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Nicolas Martignoni Issue no.: MDL-48546 Workaround: Disable multimedia filter CVE identifier: CVE-2015-0217 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 48546

====================================================================== ======== MSA-15-0008: Forced logout through Shibboleth authentication plugin

Description: It was possible to forge a request to logout users even when not authenticated through Shibboleth Issue summary: Forced logout via auth/shibboleth/logout.php Severity/Risk: Serious Versions affected: 2.8 to 2.8.1, 2.7 to 2.7.3, 2.6 to 2.6.6 and earlier unsupported versions Versions fixed: 2.8.2, 2.7.4 and 2.6.7 Reported by: Petr Skoda Issue no.: MDL-47964 Workaround: Deny access to file auth/shibboleth/logout.php in webserver configuration CVE identifier:
CVE-2015-0218 Changes (master):
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL- 47964

====================================================================== ========

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
432181	SCA: security update for moodle/moodle (GHSA-p497-37fc-xvvc)	Tenable Cloud Security	SCA Checks	medium
432181	SCA: security update for moodle/moodle (GHSA-p497-37fc-xvvc)	Tenable Self-Hosted Container Security	SCA Checks	medium
8725	Moodle < 2.6 / 2.6.x < 2.6.7 / 2.7.x < 2.7.4 / 2.8.x < 2.8.2 Multiple Vulnerabilities	Nessus Network Monitor	CGI	medium
81360	Fedora 21 : moodle-2.7.5-1.fc21 (2015-1751)	Nessus	Fedora Local Security Checks	medium

Detections

Analytics

CVE-2015-0217

medium

Tenable Plugins

medium

medium

medium

medium