Microsoft Windows 10/Server 2016 Task Scheduler Service printconfig.dll privileges management
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
7.1 | $0-$5k | 0.00 |
A vulnerability was found in Microsoft Windows 10/Server 2016 (Operating System) and classified as critical. Affected by this issue is an unknown part in the library C:\Windows\System32\DriverStore\FileRepository\prnms003.inf_amd64_4592475aca2acf83\Amd64\printconfig.dll of the component Task Scheduler Service. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability.
The weakness was published 08/28/2018 by SandboxEscaper as not defined tweet (Twitter). The advisory is available at twitter.com. The vendor was not involved in the coordination of the public release. Local access is required to approach this attack. A simple authentication is necessary for exploitation. Technical details as well as a public exploit are known. This vulnerability is assigned to T1068 by the MITRE ATT&CK project. The advisory points out:
Tasks created by the task scheduler will create a corresponding folder/file in c:\windows\system32\tasks. This function seems to be designed to write the DACL of tasks located there, and will do so while impersonating. However, for some reason it will also check if a .job file exists under c:\windows\tasks and try to set the DACL while not impersonating. Since a user, and even a user belonging to the guests group can create files in this folder, we can simply create a hardlink to another file (all we need is read access). Because of the hardlink, we can let the task scheduler write an arbitrary DACL (see second parameter of SchRpcSetSecurity) to a file of our choosing.
A public exploit has been developed by SandboxEscaper and been published immediately after the advisory. The exploit is available at github.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
The vulnerability is also documented in the vulnerability database at Exploit-DB (45280). tenable.com is providing further details.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 7.8VulDB Meta Temp Score: 7.1
VulDB Base Score: 7.8
VulDB Temp Score: 7.1
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
Exploiting
Class: Privileges managementCWE: CWE-269 / CWE-266
ATT&CK: T1068
Local: Yes
Remote: No
Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: SandboxEscaper
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
Exploit-DB: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍
Timeline
08/28/2018 🔍08/28/2018 🔍
08/28/2018 🔍
08/29/2018 🔍
03/19/2020 🔍
Sources
Vendor: microsoft.comProduct: microsoft.com
Advisory: twitter.com
Researcher: SandboxEscaper
Status: Not defined
CERT VU: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161215
Misc.: 🔍
Entry
Created: 08/29/2018 09:52Updated: 03/19/2020 08:22
Changes: 08/29/2018 09:52 (49), 03/19/2020 08:22 (3)
Complete: 🔍
Submitter: misc
Submit
Accepted
- Submit #35: Microsoft Windows - Advanced Local Procedure Call (ALPC) Local Privilege Escalation (by misc)
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