Tickets :: Comment on [#6399] Unsanitized theme include vulnerability

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Comment	> Copy/paste from http://www.securityfocus.com/archive/1/489239: > > > > ------------------------- > > > > Horde 3.1.6 arbitrary file inclusion vulnerability, proof of concept & patch. > > > > A severe security vulnerability affects any unix distribution running > version 3.1.6 of the Horde webmail client included in most popular > webhosting control panels. All previous versions are also affected > and it is believed although not yet proven that Horde Groupware is > also vulnerable. > > > > Details are as follows: > > > > David Collins and Patrick Pelanne along with the rest of the > HostGator.com LLC support team discovered that Horde was not properly > sanitizing POST variables for several options including it's themes. > By maliciously modifying POST data sent to the client the attacker > can modify the location of the theme variable and Horde will > subsequently insert this information into it's database. By modifying > this POST variable one can allow for directory traversal and file > inclusion which can lead to full root privilege escalation. > > > > Proof of concept: > > > > Data injected through malicious tampering of POST data: > > > > mysql> select * from horde_prefs where pref_uid='bbarker (at) > hostgator (dot) com [email concealed]' and pref_name='theme'; > > > > +-------------------------+------------+-----------+-------------------- > > ------------------------------------------------------------------------ > > --------------------------------+ > > > > \| pref_uid \| pref_scope \| pref_name \| pref_value \| > > > > +-------------------------+------------+-----------+-------------------- > > ------------------------------------------------------------------------ > > --------------------------------+ > > > > \| bbarker (at) hostgator (dot) com [email concealed] \| horde \| theme > \| > ../../../../../../../../../../../../../../../../../../tmp/.horde/imp/att > > achments/bbarker (at) hostgator (dot) com [email > concealed]/1204804402/t.txt \| > > > > Shown above, the malicious POST variable was inserted into the > database and now points to the malicious code denoted by t.txt > > > > A truncated strace shows the access and execution of the malicious > code when the user enters the Horde webmail client: > > > > 31852 lstat64("/usr", {st_dev=makedev(3, 3), st_ino=2, > st_mode=S_IFDIR\|0755, st_nlink=18, st_uid=0, st_gid=0, > st_blksize=4096, st_blocks=16, st_size=4096, s$ > > > > 31852 lstat64("/usr/local", {st_dev=makedev(3, 3), st_ino=608001, > st_mode=S_IFDIR\|0755, st_nlink=26, st_uid=0, st_gid=0, > st_blksize=4096, st_blocks=16, st_s$ > > > > 31852 lstat64("/usr/local/cpanel", {st_dev=makedev(3, 3), > st_ino=18539, st_mode=S_IFDIR\|0711, st_nlink=37, st_uid=0, st_gid=10, > st_blksize=4096, st_blocks=8$ > > > > 31852 lstat64("/usr/local/cpanel/base", {st_dev=makedev(3, 3), > st_ino=85078, st_mode=S_IFDIR\|0755, st_nlink=21, st_uid=0, st_gid=0, > st_blksize=4096, st_bloc$ > > > > 31852 lstat64("/usr/local/cpanel/base/horde", {st_dev=makedev(3, 3), > st_ino=85388, st_mode=S_IFDIR\|0755, st_nlink=21, st_uid=32002, > st_gid=32004, st_blksize$ > > > > 31852 lstat64("/usr/local/cpanel/base/horde/config", > {st_dev=makedev(3, 3), st_ino=115868, st_mode=S_IFDIR\|0755, > st_nlink=2, st_uid=32002, st_gid=32004, st_$ > > > > 31852 lstat64("/usr/local/cpanel/base/horde/themes", > {st_dev=makedev(3, 3), st_ino=86796, st_mode=S_IFDIR\|0755, > st_nlink=28, st_uid=32002, st_gid=32004, st_$ > > > > 31852 lstat64("/tmp", {st_dev=makedev(7, 1), st_ino=2, > st_mode=S_IFDIR\|S_ISVTX\|0777, st_nlink=9, st_uid=0, st_gid=0, > st_blksize=4096, st_blocks=64, st_size=$ > > > > 31852 lstat64("/tmp/.horde", {st_dev=makedev(7, 1), st_ino=38609, > st_mode=S_IFDIR\|0700, st_nlink=3, st_uid=32002, st_gid=32004, > st_blksize=4096, st_blocks=2$ > > > > 31852 lstat64("/tmp/.horde/imp", {st_dev=makedev(7, 1), st_ino=38610, > st_mode=S_IFDIR\|0700, st_nlink=3, st_uid=32002, st_gid=32004, > st_blksize=4096, st_bloc$ > > > > 31852 lstat64("/tmp/.horde/imp/attachments", {st_dev=makedev(7, 1), > st_ino=38611, st_mode=S_IFDIR\|0700, st_nlink=3, st_uid=32002, > st_gid=32004, st_blksize=4$ > > > > 31852 lstat64("/tmp/.horde/imp/attachments/patrick (at) hostgator > (dot) com [email concealed]", {st_dev=makedev(7, 1), st_ino=38612, > st_mode=S_IFDIR\|0700, st_nlink=3, st_uid=32002, st$ > > > > 31852 lstat64("/tmp/.horde/imp/attachments/patrick (at) hostgator > (dot) com [email concealed]/1204804402", {st_dev=makedev(7, 1), > st_ino=38613, st_mode=S_IFDIR\|0700, st_nlink=2, st_ui$ > > > > 31852 lstat64("/tmp/.horde/imp/attachments/patrick (at) hostgator > (dot) com [email concealed]/1204804402/t. > > txt", {st_dev=makedev(7, 1), st_ino=38614, st_mode=S_IFREG\|0600, st_nlink=1,$ > > > > 31852 open("/tmp/.horde/imp/attachments/patrick (at) hostgator (dot) > com [email concealed]/1204804402/t.txt > > ", O_RDONLY) = 4 > > > > We have also included a patch below for this vulnerability tested on > Horde v2.105.4.8 2006/07/29 16:49:19 > > > > --- horde/lib/Horde/Prefs.php 2008-03-06 21:14:38.000000000 -0600 > > > > +++ horde/lib/Horde/Prefs.patched 2008-03-06 20:10:56.000000000 -0600 > > > > @@ -325,12 +325,23 @@ > > > > } > > > > return (isset($this->_prefs[$pref]['v'])) ? > > > > - ($convert ? > > > > + $this->_fixhole($pref,$convert ? > > > > $this->convertFromDriver($this->_prefs[$pref]['v'], $charset) : > > > > $this->_prefs[$pref]['v']) : > > > > null; > > > > } > > > > +function _fixhole($pref,$value) { > > > > + $sanitize = '/^[a-z0-9._-]+$/i'; > > > > + if (preg_match($sanitize, $value) && $pref == 'theme') { > > > > + return $value; > > > > + } elseif ($pref == 'theme') { > > > > + return "mozilla"; > > > > + } else { > > > > + return $value; > > > > + } > > > > +} > > > > + > > > > function __get($name) > > > > { > > > > return $this->getValue($name); > > > > -------------------------- > > > > Sorry because I know someone's probably already aware: but I didn't > see any word on this after several hours on either the Horde site, in > the bug database, or on the Horde mailing list archives
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