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AUSCERT External Security Bulletin Redistribution
risk on other users' Dashboards
19 March 2019
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2019-3847
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Tuesday, 19 March 2019, 11:06 AM
Users with the "login as other users" capability (such as administrators/
users may have added to their Dashboard was not being escaped when being viewed
by the user logging in on their behalf.
Please note that for versions 3.1 and 3.4 only, this fix removes access to
other users' Dashboards while using the login-as functionality. Versions 3.5
and 3.6 have additional sanitizing implemented, which allowed the risk to be
removed while retaining Dashboard access. If you require access to Dashboards
through the login-as feature, we recommend upgrading to Moodle 3.5 or above
(noting that 3.1 and 3.4 will also no longer receive security updates after
their next releases in May 2019).
Versions affected: 3.6 to 3.6.2, 3.5 to 3.5.4, 3.4 to 3.4.7, 3.1 to 3.1.16 and
earlier unsupported versions
Versions fixed: 3.6.3, 3.5.5, 3.4.8 and 3.1.17
Reported by: Daniel Thatcher
Workaround: Use incognito/private browsing mode when using the "Log in as"
functionality, then close the private window
before logging back in as your own user, to
minimise session or cookie related risks.
Alternatively, avoid visiting the Dashboard
when logged in as other users until patch is
CVE identifier: CVE-2019-3847
Changes (master): http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-63786
on other users' Dashboards
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