GHSA-958r-g534-ccmr

MadsKristensen.AspNetCore.Miniblog subject to Improper Input Validation

Source: GitHub Advisory Database (reviewed) Critical CVE-2019-9845

Packages

Ecosystem	Package	Affected	Fixed in
NuGet	MadsKristensen.AspNetCore.Miniblog	<= 1.0.3	no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

madskristensen Miniblog.Core through 2019-01-16 allows remote attackers to execute arbitrary ASPX code via an IMG element with a data: URL, because SaveFilesToDisk in Controllers/BlogController.cs writes a decoded base64 string to a file without validating the extension.

References

External links from the advisory. They lead to third-party sites.

https://nvd.nist.gov/vuln/detail/CVE-2019-9845 advisory
https://github.com/advisories/GHSA-958r-g534-ccmr advisory
https://github.com/madskristensen/Miniblog.Core package
https://github.com/madskristensen/Miniblog.Core/blob/master/src/Controllers/BlogController.cs#L142 web
https://rastating.github.io/miniblog-remote-code-execution web