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Category:   OS (Microsoft)  >   Windows DLL (Any) Vendors:   Microsoft
Microsoft Windows ALPC Access Control Flaw Lets Local Users Obtain System Privileges
SecurityTracker Alert ID:  1041578
SecurityTracker URL:  http://securitytracker.com/id/1041578
CVE Reference:   CVE-2018-8440   (Links to External Site)
Updated:  Sep 11 2018
Original Entry Date:  Aug 28 2018
Impact:   Modification of system information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7 SP1, 2008 R2 SP1, 2008 SP2, 8.1, RT 8.1, 2012, 2012 R2, 2016, 10, 10 Version 1607, 10 Version 1703, 10 Version 1709, 10 Version 1803
Description:   A vulnerability was reported in Windows. A local user can gain system privileges on the target system.

A local user can create a hard link from a readable file on the system to a '.job' file in the 'c:\windows\tasks' directory and invoke the _SchRpcSetSecurity() method of the task scheduler service ALPC endpoint to overwrite the linked file and gain system level privileges on the target system.

The original advisory is available at:

https://twitter.com/SandboxEscaper/status/1034125195148255235
https://github.com/SandboxEscaper/randomrepo/blob/master/PoC-LPE.rar

@SandboxEscaper reported this vulnerability.

Impact:   A local user can obtain system privileges on the target system.
Solution:   The vendor has issued a fix.

The Microsoft advisories are available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8440 (Links to External Site)
Cause:   Access control error

Message History:   None.


 Source Message Contents



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