Information
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Advisory by Netsparker
Name: HTTP Header Injection in LiteSpeed Web Server
Affected Software : LiteSpeed Web Server
Affected Versions: v5.1.0 and possibly below
Vendor Homepage : https://www.litespeedtech.com/ 
Vulnerability Type : HTTP Header Injection
Severity : Medium
Status : Fixed
CVE-ID : 2016-5110
Netsparker Advisory Reference : NS-16-001

Description
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While testing Netsparker, we spotted an HTTP Header Injection vulnerability in LiteSpeed Web Server.

LiteSpeed Web Server v5.1.0 and possibly below are affected if mod_userdir is enabled. This vulnerability can be exploited in various ways depending on the application.

Technical Details
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Proof of Concept URL for HTTP Header Injection in LiteSpeed Web Server:

/~%0d%0aSet-Cookie:Scanner=Netsparker%0d%0a

Advisory Timeline
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15 Jan 2016 - First Contact
18 Jan 2016 - Vendor Fixed
20 Jan 2016 - Advisory Released

Solution
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Patch released by LiteSpeed and annocunced here: https://www.litespeedtech.com/products/litespeed-web-server/release-log. Download the latest version.

Credits & Authors
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This issue has been discovered by Ziyahan Albeniz  while testing Netsparker Web Application Security Scanner.

About Netsparker
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Netsparker web application security scanners find and report security flaws and vulnerabilities such as SQL Injection and Cross-site Scripting (XSS) in all websites and web applications, regardless of the platform and technology they are built on. Netsparker scanning engine’s unique detection and exploitation techniques allow it to be dead accurate in reporting vulnerabilities. The Netsparker web application security scanner is available in two editions; Netsparker Desktop and Netsparker Cloud. Visit our website https://www.netsparker.com for more information.