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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0880 MSA-19-0004: "Log in as" functionality exposed to JavaScript risk on other users' Dashboards 19 March 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Moodle Publisher: Moodle Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Mitigation CVE Names: CVE-2019-3847 Original Bulletin: https://moodle.org/mod/forum/discuss.php?d=384010&parent=1547742 - --------------------------BEGIN INCLUDED TEXT-------------------- MSA-19-0004: "Log in as" functionality exposed to JavaScript risk on other users' Dashboards Tuesday, 19 March 2019, 11:06 AM Users with the "login as other users" capability (such as administrators/ managers) can access other users' Dashboards, but the JavaScript those other 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). Severity/Risk: Serious 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 applied. CVE identifier: CVE-2019-3847 Changes (master): http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-63786 Tracker issue: MDL-63786 "Log in as" functionality exposed to JavaScript risk on other users' Dashboards - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXJCTKGaOgq3Tt24GAQiTQg/9GB6DUwwfyrxe11QTHQJ43n6zqgiG6JdQ cjTkgNg2D9dqRxqAkLPu7ZQanz7tW6uwLJNYiz0r5eCscuVkyAHC6UxvNVvW+IjN 4YTwbpFoTIK03sSvzsAPCCfvMJ/v2rzYLv/v6k4uYRV4E3fPFzE89kJTBMTt5HTS rRpIcUuMveifT0ZEJJghfzmO1o0Q6aT+kAaemtTj4PbkZrdzl4RGIj2OLnixWYN3 pPlEunPShO4KVN/pNlGcwEKJUhZa8wRESbIlH2kOXL7ViExcuSRutkIBqXx7EVo5 4WnvkmRELi9yJKa8g5YF7UT6uG6yDNnES048WEh967UN+KnKCSvVzmWL5PipxRB3 lXQMuwD7xgQ4F4VhW1vcEVuPUJg64CQ1YUO2G6IsBtmAKeNbAOtXt6MtUzqg+See 4HOlCWDUW95MKbfOYENun8k3HY9IgM6XmGhVwQ3ilrnpQNrYczXDxKiluUvH5Z7C dua7PEDfzWoT/c289OkJMh/IBm5sRVqr2JZqm8ABSyX83QIqC61kOU/SEqKWd/mC dRfS+asobxPowozQeR12WTv5uKVCaVT2usRi/AbnjKqfZJ9PggS2hzUbE0u+JhHp IkPVfxUjgCLjHFYpr1UtIY12IxbW2kfCzqd5wB1Njmx5EVtFPTU9MsrtMBemPghy Xwp7fDWMbvU= =BC0W -----END PGP SIGNATURE-----