CVE-2020-27385

moderate-risk
Published 2020-11-12

Incorrect Access Control in the FileEditor (/Admin/Views/FileEditor/) in FlexDotnetCMS before v1.5.11 allows an authenticated remote attacker to read and write to existing files outside the web root. The files can be accessed via directory traversal, i.e., by entering a .. (dot dot) path such as ..\..\..\..\..\<file> in the input field of the FileEditor. In FlexDotnetCMS before v1.5.8, it is also possible to access files by specifying the full path (e.g., C:\<file>). The files can then be edited via the FileEditor.

Do I need to act?

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0.43% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.1/10 High
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Flexdotnetcms Project

References (4)

Exploit https://blog.vonahi.io/whats-in-a-re-name/
Release Notes https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.11
Exploit https://blog.vonahi.io/whats-in-a-re-name/
Release Notes https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.11
35
/ 100
moderate-risk
Severity 28/34 · Critical
Exploitability 2/34 · Minimal
Exposure 5/34 · Minimal