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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2558 Vulnerability Note VU#906424 30 August 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Windows Task Scheduler Operating System: Windows Impact/Access: Administrator Compromise -- Existing Account Resolution: None Original Bulletin: https://www.kb.cert.org/vuls/id/906424 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Note VU#906424 Microsoft Windows task scheduler contains a local privilege escalation vulnerability in the ALPC interface Original Release date: 27 Aug 2018 | Last revised: 29 Aug 2018 Overview Microsoft Windows task scheduler contains a local privilege escalation vulnerability in the Advanced Local Procedure Call (ALPC) interface, which can allow a local user to obtain SYSTEM privileges. Description The Microsoft Windows task scheduler SchRpcSetSecurity API contains a vulnerability in the handling of ALPC, which can allow a local user to gain SYSTEM privileges. We have confirmed that the public exploit code works on 64-bit Windows 10 and Windows Server 2016 systems. We have also confirmed compatibility with 32-bit Windows 10 with minor modifications to the public exploit code. Compatibility with other Windows versions is possible with further modifications. Impact A local user may be able to gain elevated (SYSTEM) privileges. Solution The CERT/CC is currently unaware of a practical solution to this problem. Vendor Information (Learn More) Vendor Status Date Notified Date Updated Microsoft Affected 27 Aug 2018 27 Aug 2018 If you are a vendor and your product is affected, let us know. CVSS Metrics (Learn More) Group Score Vector Base 6.8 AV:L/AC:L/Au:S/C:C/I:C/A:C Temporal 6.5 E:F/RL:U/RC:C Environmental 6.4 CDP:ND/TD:H/CR:ND/IR:ND/AR:ND References o https://github.com/SandboxEscaper/randomrepo/blob/master/PoC-LPE.rar o https://doublepulsar.com/task-scheduler-alpc-exploit-high-level-analysis-ff08cda6ad4f o https://msdn.microsoft.com/en-us/library/cc248452.aspx Credit This issue was publicly disclosed by SandboxEscaper. This document was written by Will Dormann. Other Information o CVE IDs: Unknown o Date Public: 27 Aug 2018 o Date First Published: 27 Aug 2018 o Date Last Updated: 29 Aug 2018 o Document Revision: 23 Feedback If you have feedback, comments, or additional information about this vulnerability, please send us email. - --------------------------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). 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