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Article Number: 000191057


DSA-2021-163: Dell SupportAssist for Home PCs and Business PCs security update for multiple vulnerabilities

Summary: Dell SupportAssist for Home PCs and Business PCs remediation is available for two security vulnerabilities that may be exploited by malicious users to compromise the affected system.

Article Content


Impact

High

Details

Proprietary Code CVEs 

Description 

CVSS Base Score 

CVSS Vector String  

CVE-2021-36286 

Dell SupportAssist Client Consumer versions 3.9.13.0 and any versions before 3.9.13.0 contain an arbitrary file deletion vulnerability that may be exploited by using the Windows feature of NTFS called Symbolic links. Symbolic links may be created by any (non-privileged) user under some object directories, but by themselves are not sufficient to successfully escalate privileges. However, combining them with a different object, such as the NTFS junction point, allows for exploitation. SupportAssist clean files functionality does not distinguish junction points from the physical folder and proceeds to clean the target of the junction that may allow nonprivileged users to create junction points and delete arbitrary files on the system which can be accessed only by the admin. 

7.1 

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H 

CVE-2021-36297 

SupportAssist Client version 3.8 contains an untrusted search path vulnerability that may allow attackers to load an arbitrary .dll file using .dll planting/hijacking, only by a separate administrative action that is not a default part of the SOSInstallerTool.exe installation for executing arbitrary dlls. 

7.8 

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 

Proprietary Code CVEs 

Description 

CVSS Base Score 

CVSS Vector String  

CVE-2021-36286 

Dell SupportAssist Client Consumer versions 3.9.13.0 and any versions before 3.9.13.0 contain an arbitrary file deletion vulnerability that may be exploited by using the Windows feature of NTFS called Symbolic links. Symbolic links may be created by any (non-privileged) user under some object directories, but by themselves are not sufficient to successfully escalate privileges. However, combining them with a different object, such as the NTFS junction point, allows for exploitation. SupportAssist clean files functionality does not distinguish junction points from the physical folder and proceeds to clean the target of the junction that may allow nonprivileged users to create junction points and delete arbitrary files on the system which can be accessed only by the admin. 

7.1 

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H 

CVE-2021-36297 

SupportAssist Client version 3.8 contains an untrusted search path vulnerability that may allow attackers to load an arbitrary .dll file using .dll planting/hijacking, only by a separate administrative action that is not a default part of the SOSInstallerTool.exe installation for executing arbitrary dlls. 

7.8 

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 

Dell Technologies recommends all customers consider both the CVSS base score and any relevant temporal and environmental scores that may impact the potential severity associated with a particular security vulnerability.

Affected Products and Remediation

CVEs Addressed   Product  Affected Versions  Updated Versions  Link to Update 
CVE-2021-36286  Dell SupportAssist for Home PCs  Version 3.9 and earlier 3.10  SupportAssist for Home PCs
Dell SupportAssist for Business PCs  Versions 2.4.1 and earlier 3.0.0 SupportAssist for Business PCs
CVE-2021-36297  Dell SupportAssist for Home PCs  Version 3.8 and earlier 3.9  SupportAssist for Home PCs
     
CVEs Addressed   Product  Affected Versions  Updated Versions  Link to Update 
CVE-2021-36286  Dell SupportAssist for Home PCs  Version 3.9 and earlier 3.10  SupportAssist for Home PCs
Dell SupportAssist for Business PCs  Versions 2.4.1 and earlier 3.0.0 SupportAssist for Business PCs
CVE-2021-36297  Dell SupportAssist for Home PCs  Version 3.8 and earlier 3.9  SupportAssist for Home PCs
     
Acknowledgements

Dell would like to thank Ammarit Thongthua, Chayanin Khawsanit, and Krischat Thataristorai (Secure D Research Team) for reporting CVE-2021-36286. 

Related Information

Dell Security Advisories and Notices
Dell Vulnerability Response Policy
CVSS Scoring Guide


The information in this Dell Technologies Security Advisory should be read and used to assist in avoiding situations that may arise from the problems described herein. Dell Technologies distributes Security Advisories to bring important security information to the attention of users of the affected product(s). Dell Technologies assesses the risk based on an average of risks across a diverse set of installed systems and may not represent the actual risk to your local installation and individual environment. It is recommended that all users determine the applicability of this information to their individual environments and take appropriate actions. The information set forth herein is provided "as is" without warranty of any kind. Dell Technologies expressly disclaims all warranties, either express or implied, including the warranties of merchantability, fitness for a particular purpose, title and non-infringement. In no event shall Dell Technologies, its affiliates or suppliers, be liable for any damages whatsoever arising from or related to the information contained herein or actions that you decide to take based thereon, including any direct, indirect, incidental, consequential, loss of business profits or special damages, even if Dell Technologies, its affiliates or suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages, so the foregoing limitation shall apply to the extent permissible under law.

Article Properties


Affected Product

SupportAssist, SupportAssist for Home PCs, Product Security Information, SupportAssist for Business PCs

Last Published Date

10 Nov 2021

Version

6

Article Type

Dell Security Advisory