Date: Wed, 06 Jun 2012 10:55:03 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: Mark Hoopes <xync@...c.org> Subject: Re: Arbitrary File Upload/Execution in Collabtive -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 06/06/2012 07:02 AM, Mark Hoopes wrote: > This disclosure was posted to Bugtraq yesterday > (http://www.securityfocus.com/archive/1/522973/30/0/threaded). I > am submitting it to oss-security as a request to have a CVE ID > assigned. > > TITLE: Arbitrary File Upload/Execution in Collabtive DATE: > 06-04-2012 PRODUCT: Collabtive Web-Based Project Management > Software (http://collabtive.o-dyn.de/) VERSIONS: 0.7.5, 0.6.1 > confirmed. All versions <= 0.7.5 probable RESEARCHER: Mark Hoopes > (xync@...c.org/) ADDITIONAL INFORMATION: > http://xync.org/2012/06/04/Arbitrary-File-Upload-in-Collabtive.html > > Vulnerability: During the upload of an avatar image for a > Collabtive user, the manageuser.php script checks the file type > using the MIME type provided in the POST request (via the > $_FILES['userfile']['type'] variable) rather than by extension. > This MIME type can be spoofed via an intercepting proxy or custom > POST script allowing a malicious user to upload an arbitrary file. > This file will be placed in a predictable web accessible path with > an easily determined name. In most installations, execution from > this directory is not restricted which allows a remote attacker to > execute a PHP script uploaded this way with the privileges of the > web user. > > Access to the avatar upload function is restricted to logged in > users, but because of Collabtive's design decisions in implementing > OpenID support, this is easily accomplished. If an unknown user > supplies a valid OpenID v1.0 URL as the username on the login page, > Collabtive will automatically create a new user based on the > referenced credentials. That new user is not authorized to access > any projects, but is authorized to upload an avatar image. This > allows an attacker with no other knowledge of the host site or its > users to exploit the vulnerability. > > Fix: Upgrade to Collabtive v0.7.6 or greater Source: > http://sourceforge.net/projects/collabtive/files/collabtive/0.7.6/collabtive076.zip/download > > Release Notes: http://www.collabtive.o-dyn.de/blog/?p=426 > > Workaround: Disable script execution of the upload directory via > .htaccess for Apache or similar web servers. This should apply at > minimum to the /files/[template]/avatar directory but can safely be > applied to the entire /files directory. > > Sample contents of the .htaccess file are: Options -Indexes Options > -ExecCGI AddHandler cgi-script .php .php3 .php4 .phtml .pl .py .jsp > .asp .htm .shtml .sh .cgi > > Note 'AllowOverride Options AddHandler' or 'AllowOverride All' must > be enabled in the main httpd.conf file for this directory or > inherited from a parent directory. See > http://www.mysql-apache-php.com/fileupload-security.htm > > Additional References: > http://xync.org/2012/06/04/Arbitrary-File-Upload-in-Collabtive.html > > http://www.php.net/manual/en/features.file-upload.post-method.php > see comments for $_FILES['userfile']['type'] > > > TIMELINE: April 18, 2012 - Issue reported to developers April 19, > 2012 - Fix committed to Collabtive github May 30, 2012 - > Collabtive version 0.7.6 released w/ fix June 4, 2012 - > Vulnerability published > Please use CVE-2012-2670 for this issue. BTW very nicely formatted/informative email, well done. Also bonus points for offering a workaround =). - -- Kurt Seifried Red Hat Security Response Team (SRT) PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJPz4tnAAoJEBYNRVNeJnmTfgEQAJK6aOlQx3XH2JB1NZ2kFUn2 XVvk8aF9fFmo2fIz0hvIhiNSwy8dhbrgisw35Cg8GfnMWQncgI/gTJUbcYKw76mb SsDf1iZDAFGEJYRdqyXijrbHCfFG27ZoOkEyZ1lmwDb10nIngZUt6RQBDI3dnWUn YVGG6EbV9a9HJjcDuKf3dsnMy8p/hXap3TNDM8p32N36KvUBAcGKEdvTmL0u9oIu R8bBOEqm0+Awd7a3KkmwQWar5QpcQGHrob9Gp5XG1muoeNC+CGbjvenbeWzzSVr4 tDub2Sh3Wx61w5Ff5ppqPjd2haeV5ZOaiimGoht9E0+mrSJPY4NOCMRxIvUfd2IR E6Avj2bpATxBEfU5JBloh9UbqLR37WItAU49idIwDr9zqVKKG/wgUSWOTzS+47oU h4+eLtFovS3rNJxNZBh0OTk0uUJ3735N5LArje45SIiyxnUT0Wi7gcUV9JlV203K /mEVRMI/0Jvd0FYKzEeXbvRV+4HcMTiSCG6OP4SZsbIDRFMUEsQ30Nw950IN+gTb vcHUQEBxumK5zdBZ+zDEidEsKLjkPDiJSQ2Ng8VGSDy2rqUl9ACJnX27BSsqqZJA iooyA0yMbXKwTs1LjYZulDu5l11mRtAXF331QbIG4AtnD2tvE2QPjk1CMJouPE40 ihjZQBiBHTEFTlzB8rCO =NwJS -----END PGP SIGNATURE-----
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