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AUSCERT External Security Bulletin Redistribution
ESB-2020.0939
Multiple vulnerabilities have been identified in Moodle
17 March 2020
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AusCERT Security Bulletin Summary
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Product: Moodle
Publisher: Moodle
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Provide Misleading Information -- Existing Account
Unauthorised Access -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-1756 CVE-2020-1755 CVE-2020-1754
Original Bulletin:
https://moodle.org/mod/forum/discuss.php?d=398350&parent=1606854
https://moodle.org/mod/forum/discuss.php?d=398351&parent=1606855
https://moodle.org/mod/forum/discuss.php?d=398352&parent=1606856
Comment: This bulletin contains three (3) Moodle security advisories.
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MSA-20-0002: Grade history report does not respect Separate groups mode in the
course settings
Users viewing the grade history report without the 'access all groups'
capability were not restricted to viewing grades of users within their own
groups.
Severity/Risk: Minor
Versions affected: 3.8 to 3.8.1, 3.7 to 3.7.4, 3.6 to 3.6.8, 3.5 to 3.5.10 and
earlier unsupported versions
Versions fixed: 3.8.2, 3.7.5, 3.6.9 and 3.5.11
Reported by: Tim Hunt
CVE identifier: CVE-2020-1754
Changes (master): http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-56287
Tracker issue: MDL-56287 Grade history report does not respect Separate
groups mode in the course settings
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MSA-20-0003: IP addresses can be spoofed using X-Forwarded-For
X-Forwarded-For headers could be used to spoof a user's IP, in order to bypass
remote address checks.
PATCH NOTE: For user IPs to be checked (and logged) accurately after this patch
is applied, sites using multiple levels of reverse proxies/balancers that
append to the X-Forwarded-For header will need to configure the new "
reverseproxyignore " setting. This ensures the IPs of the later proxies are
ignored in favour of the user's IP.
Severity/Risk: Serious
Versions affected: 3.8 to 3.8.1, 3.7 to 3.7.4, 3.6 to 3.6.8, 3.5 to 3.5.10 and
earlier unsupported versions
Versions fixed: 3.8.2, 3.7.5, 3.6.9 and 3.5.11
Reported by: Brendan Heywood
CVE identifier: CVE-2020-1755
Changes (master): http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-67861
Tracker issue: MDL-67861 IP addresses can be spoofed using X-Forwarded-For
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MSA-20-0004: Admin PHP unit webrunner tool requires additional input escaping
Insufficient input escaping was applied to the PHP unit webrunner admin tool.
NOTE: It is important to note that this update is only flagged as a
precautionary measure, as it may provide limited CLI access to Moodle site
admins. This may be considered a security risk in circumstances where admins do
not ordinarily have access to the server CLI and/or in some hosting situations
where site admins are not considered trusted users. This tool will also be
removed entirely from Moodle 3.9.
Severity/Risk: Minor
Versions affected: 3.8 to 3.8.1, 3.7 to 3.7.4, 3.6 to 3.6.8, 3.5 to 3.5.10 and
earlier unsupported versions
Versions fixed: 3.8.2, 3.7.5, 3.6.9 and 3.5.11
Reported by: Brendan Heywood
CVE identifier: CVE-2020-1756
Changes (master): http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-67726
Tracker issue: MDL-67726 Admin PHP unit webrunner tool requires additional
input escaping
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