CVE-2020-15111 Information

Description

In Fiber before version 1.12.6 the filename that is given in c.Attachment() (https://docs.gofiber.io/ctxattachment) is not escaped and therefore vulnerable for a CRLF injection attack. I.e. an attacker could upload a custom filename and then give the link to the victim. With this filename the attacker can change the name of the downloaded file redirect to another site change the authorization header etc. A possible workaround is to serialize the input before passing it to ctx.Attachment().

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Reference

https://github.com/gofiber/fiber/pull/579/commits/f698b5d5066cfe594102ae252cd58a1fe57cf56f https://github.com/gofiber/fiber/security/advisories/GHSA-9cx9-x2gp-9qvh

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

5.4