Cross-site scripting (XSS) vulnerability in the external_format_text function in lib/externallib.php in Moodle through 2.5.9, 2.6.x before 2.6.11, 2.7.x before 2.7.8, and 2.8.x before 2.8.6 allows remote authenticated users to inject arbitrary web script or HTML into an external application via a crafted string that is visible to web services.

The remote web server hosts Moodle, an open-source course management system.  Versions of Moodle 2.6.x prior to 2.6.11, and 2.7.x prior to 2.7.8 are exposed to the following vulnerabilities :

 - A flaw exists in Quiz manual-grading that is due to the program failing to use the Cross-Site Scripting (XSS) mask flag 'mod/quiz:grade'.  This may result in administrators being unaware that this is a trusted action that represents an XSS risk. (CVE-2015-3174)
 - A flaw exists in the 'get_referer()' function that is triggered when using 'redirect()', which can cause some error messages in the display button to return to the previous page.  This may allow a context-dependent attacker to conduct phishing attacks. (CVE-2015-3175)
 - A flaw exists on sites with enabled self-registration that may allow a remote attacker to gain access to user fullname through account confirmation links. (CVE-2015-3176)
 - A flaw exists that allows a XSS attack.  This flaw exists because the 'external_format_text()' function does not validate input when displaying it to other users in the external application.  This may allow an authenticated remote attacker to create a specially crafted request that would execute arbitrary script code in a user's browser session within the trust relationship between the browser and the server. (CVE-2015-3178)
 - A flaw exists when self-registration is enabled that may allow a user who was suspended after creating their account, but before confirming it, to login a single time after account confirmation. (CVE-2015-3179)
 - A flaw exists that may allow an authenticated remote attacker with suspended enrollment to gain access to the course structure in the navigation block.  This may allow the attacker to gain unauthorized access to information. (CVE-2015-3180)
 - A flaw exists that may result in permissions not being properly removed when manageownfiles permissions are revoked from a user. This may allow an authenticated remote attacker to upload private files via Web Services. (CVE-2015-3181)

The remote web server hosts Moodle, an open-source course management system.  Versions of Moodle 2.8.x prior to 2.8.6 are exposed to the following vulnerabilities :

 - A flaw exists in Quiz manual-grading that is due to the program failing to use the Cross-Site Scripting (XSS) mask flag 'mod/quiz:grade'.  This may result in administrators being unaware that this is a trusted action that represents an XSS risk. (CVE-2015-3174)
 - A flaw exists in the 'get_referer()' function that is triggered when using 'redirect()', which can cause some error messages in the display button to return to the previous page.  This may allow a context-dependent attacker to conduct phishing attacks. (CVE-2015-3175)
 - A flaw exists on sites with enabled self-registration that may allow a remote attacker to gain access to user fullname through account confirmation links. (CVE-2015-3176)
 - A flaw exists that is due to the program allowing users to subscribe themselves to site wide events.  This may allow an authenticated remote attacker to gain access to potentially sensitive information. (CVE-2015-3177)
 - A flaw exists that allows a XSS attack.  This flaw exists because the 'external_format_text()' function does not validate input when displaying it to other users in the external application.  This may allow an authenticated remote attacker to create a specially crafted request that would execute arbitrary script code in a user's browser session within the trust relationship between the browser and the server. (CVE-2015-3178)
 - A flaw exists when self-registration is enabled that may allow a user who was suspended after creating their account, but before confirming it, to login a single time after account confirmation. (CVE-2015-3179)
 - A flaw exists that may allow an authenticated remote attacker with suspended enrollment to gain access to the course structure in the navigation block.  This may allow the attacker to gain unauthorized access to information. (CVE-2015-3180)
 - A flaw exists that may result in permissions not being properly removed when manageownfiles permissions are revoked from a user. This may allow an authenticated remote attacker to upload private files via Web Services. (CVE-2015-3181)

moodle-2.9.1-1.fc23 - 2.9.1

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.

moodle-2.7.9-1.fc21 - 2.7.9.

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.

moodle-2.8.7-1.fc22 - Latest upstream release.

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
9426	Moodle 2.6.x < 2.6.11 / 2.7.x < 2.7.8 Multiple Vulnerabilities	Nessus Network Monitor	CGI	critical
9425	Moodle 2.8.x < 2.8.6 Multiple Vulnerabilities	Nessus Network Monitor	CGI	critical
86032	Fedora 23 : moodle-2.9.1-1.fc23 (2015-14987)	Nessus	Fedora Local Security Checks	high
85956	Fedora 21 : moodle-2.7.9-1.fc21 (2015-14996)	Nessus	Fedora Local Security Checks	high
85955	Fedora 22 : moodle-2.8.7-1.fc22 (2015-14988)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2015-3178

medium

Tenable Plugins

critical

critical

high

high

high