mailman web admin pages doesnt work with apache2 mpm-itk

1) Description: Ubuntu 14.04.3 LTS
Release: 14.04

2) Package version: 2.4.6-01-1

3) Installed mailman. Using apache2 with mpm-itk. When accessing mailman admin web pages, witch should be executed trough cgi, expected to see the admin pages. For example, accessing http://my.domain.com/mailman/listinfo, it should show mailman's list info page.

4) This message error is showed instead:

Mailman CGI error!!!
The Mailman CGI wrapper encountered a fatal error. This entry is being stored in your syslog:

Operation not permitted

5) No error messages are logged on apache error logs. On syslog this error message is logged:
Aug 25 14:36:13 mariscal2 Mailman cgi-wrapper (listinfo): Operation not permitted

6) Workaround: compiled latest version o mpm-itk, 2.4.7-02. After that, replaced /usr/lib/apache2/modules/mpm-itk.so with the new version compiled.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: libapache2-mpm-itk 2.4.6-01-1
ProcVersionSignature: Ubuntu 3.13.0-61.100-generic 3.13.11-ckt22
Uname: Linux 3.13.0-61-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: amd64
Date: Tue Aug 25 14:28:29 2015
Dependencies:
 gcc-4.9-base 4.9.1-0ubuntu1
 libc6 2.19-0ubuntu6.6
 libcap2 1:2.24-0ubuntu2
 libgcc1 1:4.9.1-0ubuntu1
 multiarch-support 2.19-0ubuntu6.6
InstallationDate: Installed on 2015-07-20 (36 days ago)
InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
SourcePackage: mpm-itk
UpgradeStatus: No upgrade log present (probably fresh install)