Vulnerabilities > CVE-2015-0212 - Cross-Site Scripting vulnerability in Moodle

047910
CVSS 3.5 - LOW
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
SINGLE
Confidentiality impact
NONE
Integrity impact
PARTIAL
Availability impact
NONE
network
moodle
CWE-79
nessus

Summary

Cross-site scripting (XSS) vulnerability in course/pending.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 inject arbitrary web script or HTML via a crafted course summary.

Vulnerable Configurations

Part Description Count
Application
Moodle
163

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Embedding Scripts in Non-Script Elements
    This attack is a form of Cross-Site Scripting (XSS) where malicious scripts are embedded in elements that are not expected to host scripts such as image tags (<img>), comments in XML documents (< !-CDATA->), etc. These tags may not be subject to the same input validation, output validation, and other content filtering and checking routines, so this can create an opportunity for an attacker to tunnel through the application's elements and launch a XSS attack through other elements. As with all remote attacks, it is important to differentiate the ability to launch an attack (such as probing an internal network for unpatched servers) and the ability of the remote attacker to collect and interpret the output of said attack.
  • Embedding Scripts within Scripts
    An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
  • Cross-Site Scripting in Error Pages
    An attacker distributes a link (or possibly some other query structure) with a request to a third party web server that is malformed and also contains a block of exploit code in order to have the exploit become live code in the resulting error page. When the third party web server receives the crafted request and notes the error it then creates an error message that echoes the malformed message, including the exploit. Doing this converts the exploit portion of the message into to valid language elements that are executed by the viewing browser. When a victim executes the query provided by the attacker the infected error message error message is returned including the exploit code which then runs in the victim's browser. XSS can result in execution of code as well as data leakage (e.g. session cookies can be sent to the attacker). This type of attack is especially dangerous since the exploit appears to come from the third party web server, who the victim may trust and hence be more vulnerable to deception.
  • Cross-Site Scripting Using Alternate Syntax
    The attacker uses alternate forms of keywords or commands that result in the same action as the primary form but which may not be caught by filters. For example, many keywords are processed in a case insensitive manner. If the site's web filtering algorithm does not convert all tags into a consistent case before the comparison with forbidden keywords it is possible to bypass filters (e.g., incomplete black lists) by using an alternate case structure. For example, the "script" tag using the alternate forms of "Script" or "ScRiPt" may bypass filters where "script" is the only form tested. Other variants using different syntax representations are also possible as well as using pollution meta-characters or entities that are eventually ignored by the rendering engine. The attack can result in the execution of otherwise prohibited functionality.

Nessus

NASL familyFedora Local Security Checks
NASL idFEDORA_2015-1751.NASL
descriptionThe 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
last seen2020-06-05
modified2015-02-16
plugin id81360
published2015-02-16
reporterThis script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/81360
titleFedora 21 : moodle-2.7.5-1.fc21 (2015-1751)
code
#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2015-1751.
#

include("compat.inc");

if (description)
{
  script_id(81360);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2015-0211", "CVE-2015-0212", "CVE-2015-0213", "CVE-2015-0214", "CVE-2015-0215", "CVE-2015-0216", "CVE-2015-0217", "CVE-2015-0218");
  script_xref(name:"FEDORA", value:"2015-1751");

  script_name(english:"Fedora 21 : moodle-2.7.5-1.fc21 (2015-1751)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"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."
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-47920
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?727765b3"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-47964
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?bc5a7611"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48017
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?864d680d"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48034
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?fc0ccea3"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48106
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?0290e85a"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48329
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?3ff3fbb8"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48368
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?7368900b"
  );
  # http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-48546
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?c3fa9023"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=1183694"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=1183695"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2015-February/149920.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?e7699242"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected moodle package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:moodle");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:21");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/06/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/02/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/02/16");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^21([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 21.x", "Fedora " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC21", reference:"moodle-2.7.5-1.fc21")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "moodle");
}