Vulnerability · Published Nov 12, 2020 · Assigned by mitre
CVE-2020-27386
High 8.8
In plain English
A high-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 71.6% (higher than 99.4% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit.
Official description
An unrestricted file upload issue in FlexDotnetCMS before v1.5.9 allows an authenticated remote attacker to upload and execute arbitrary files by using the FileManager to upload malicious code (e.g., ASP code) in the form of a safe file type (e.g., a TXT file), and then using the FileEditor (in v1.5.8 and prior) or the FileManager's rename function (in v1.5.7 and prior) to rename the file to an executable extension (e.g., ASP), and finally executing the file via an HTTP GET request to /<path_to_file>.
Affected products (as reported)
References
- https://github.com/MacdonaldRobinson/FlexDotnetCMS/releases/tag/v1.5.9 x_refsource_MISC
- https://blog.vonahi.io/whats-in-a-re-name/ x_refsource_MISC
- https://github.com/rapid7/metasploit-framework/pull/14339 x_refsource_MISC
- http://packetstormsecurity.com/files/160411/FlexDotnetCMS-1.5.8-Arbitrary-ASP-File-Upload.html x_refsource_MISC