Arch Linux: 201807-1 Medium: GitLab XSS and Validation Issues

The package gitlab before version 11.0.1-1 is vulnerable to multiple issues including cross-site scripting and insufficient validation.

Arch Linux Security Advisory ASA-201807-1
========================================
Severity: Medium
Date    : 2018-07-04
CVE-ID  : CVE-2018-3740 CVE-2018-12606 CVE-2018-12607
Package : gitlab
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-726

Summary
======
The package gitlab before version 11.0.1-1 is vulnerable to multiple
issues including cross-site scripting and insufficient validation.

Resolution
=========
Upgrade to 11.0.1-1.

# pacman -Syu "gitlab>=11.0.1-1"

The problems have been fixed upstream in version 11.0.1.

Workaround
=========
None.

Description
==========
- CVE-2018-3740 (insufficient validation)

A specially crafted HTML fragment can cause Sanitize gem for Ruby to
allow non-whitelisted attributes to be used on a whitelisted HTML
element.

- CVE-2018-12606 (cross-site scripting)

The wiki contains a persistent XSS issue due to a lack of output
encoding affecting a specific markdown feature.

- CVE-2018-12607 (cross-site scripting)

The charts feature contained a persistent XSS issue due to a lack of
output encoding.

Impact
=====
An attacker is able to use a GitLab server to execute malicious
Javascript code on its users via a crafted HTML chart or specific
markdown features.

References
=========
https://security.archlinux.org/CVE-2018-3740
https://security.archlinux.org/CVE-2018-12606
https://security.archlinux.org/CVE-2018-12607