Vulnerability Details : CVE-2021-36286
Dell SupportAssist Client Consumer versions 3.9.13.0 and any versions prior to 3.9.13.0 contain an arbitrary file deletion vulnerability that can be exploited by using the Windows feature of NTFS called Symbolic links. Symbolic links can 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 the exploitation. Support assist clean files functionality do not distinguish junction points from the physical folder and proceeds to clean the target of the junction that allows nonprivileged users to create junction points and delete arbitrary files on the system which can be accessed only by the admin.
Vulnerability category: Directory traversal
Products affected by CVE-2021-36286
- cpe:2.3:a:dell:supportassist_client_consumer:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-36286
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 8 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-36286
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.6
|
LOW | AV:L/AC:L/Au:N/C:N/I:P/A:P |
3.9
|
4.9
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
1.8
|
5.2
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
1.8
|
5.2
|
Dell |
CWE ids for CVE-2021-36286
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: security_alert@emc.com (Secondary)
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-36286
-
https://www.dell.com/support/kbdoc/en-us/000191057/dsa-2021-163-dell-supportassist-client-consumer-security-update-for-two-vulnerabilities
DSA-2021-163: Dell SupportAssist Client Consumer Security Update for Two Vulnerabilities. | Dell NederlandPatch;Vendor Advisory
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