The filename parameter of the Context.FileAttachment function is not properly sanitized. A maliciously crafted filename can cause the Content-Disposition header to be sent with an unexpected filename value or otherwise modify the Content-Disposition header. For example, a filename of "setup.bat";x=.txt" will be sent as a file named "setup.bat".

If the FileAttachment function is called with names provided by an untrusted source, this may permit an attacker to cause a file to be served with a name different than provided. Maliciously crafted attachment file name can modify the Content-Disposition header.

References

• gin-gonic/gin#3555
• gin-gonic/gin#3556
• https://pkg.go.dev/vuln/GO-2023-1737
• https://github.com/gin-gonic/gin/releases/tag/v1.9.1
• https://nvd.nist.gov/vuln/detail/CVE-2023-29401