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Bug #45466 imap_open() does not validate passed parameters
Submitted: 2008-07-09 12:37 UTC Modified: 2009-01-27 20:55 UTC
From: slim at inbox dot lv Assigned:
Status: Not a bug Package: IMAP related
PHP Version: 5.2CVS-2008-07-10 OS: linux
Private report: No CVE-ID: None
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 [2008-07-09 12:37 UTC] slim at inbox dot lv
"imap_open" function does not check arguments for non-empty values.
Empty arguments crash c-client (as c-client-2006k) with 
"php-cgi: IMAP toolkit crash: Unable to look up user name" followed by php-cgi crash as well.

Reproduce code:
echo 'start ';
if ( ($link = imap_open($dsn, $username, $password, $flags)) === false ) {
   echo 'cannt open';
echo ' finish';

Expected result:
"imap_open" function should return FALSE in case of missing or empty any of REQUIRED arg.

Actual result:
#0  0xb23b5402 in __kernel_vsyscall ()
#1  0xb195c601 in raise () from /lib/
#2  0xb195de5c in abort () from /lib/
#3  0x08395881 in fatal ()
#4  0x0839ccce in myusername_full ()
#5  0x0839ce7c in myhomedir ()
#6  0x083fb667 in mh_path ()
#7  0x083fbf8a in mh_isvalid ()
#8  0x083fca02 in mh_valid ()
#9  0x083a2b98 in mail_valid ()
#10 0x083b0d1b in mail_open ()
#11 0x08157783 in php_imap_do_open (ht=4, return_value=0x8ba2a48, return_value_ptr=0x0, this_ptr=0x0, 
    return_value_used=1, persistent=0)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/ext/imap/php_imap.c:804
#12 0x08157923 in zif_imap_open (ht=4, return_value=0x8ba2a48, return_value_ptr=0x0, this_ptr=0x0, 
    return_value_used=1) at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/ext/imap/php_imap.c:825
#13 0x0833b134 in zend_do_fcall_common_helper_SPEC (execute_data=0xbc55be40)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/Zend/zend_vm_execute.h:200
#14 0x08340d95 in ZEND_DO_FCALL_SPEC_CONST_HANDLER (execute_data=0xbc55be40)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/Zend/zend_vm_execute.h:1679
#15 0x0833ac79 in execute (op_array=0x8b9a568)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/Zend/zend_vm_execute.h:92
#16 0x08313b59 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/Zend/zend.c:1134
#17 0x082bbfe9 in php_execute_script (primary_file=0xbc560270)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/main/main.c:2007
#18 0x08394dec in main (argc=1, argv=0xbc560364)
    at /var/tmp/portage/dev-lang/php-5.2.6-r2/work/php-5.2.6/sapi/cgi/cgi_main.c:1919


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 [2008-07-10 14:56 UTC] slim at inbox dot lv
same result:
#0  0xacb89402 in __kernel_vsyscall ()
(gdb) bt
#0  0xacb89402 in __kernel_vsyscall ()
#1  0xac130601 in raise () from /lib/
#2  0xac131e5c in abort () from /lib/
#3  0x083956b1 in fatal ()
#4  0x0839cafe in myusername_full ()
#5  0x0839ccac in myhomedir ()
#6  0x083fb497 in mh_path ()
#7  0x083fbdba in mh_isvalid ()
#8  0x083fc832 in mh_valid ()
#9  0x083a29c8 in mail_valid ()
#10 0x083b0b4b in mail_open ()
#11 0x0815768b in php_imap_do_open (ht=4, return_value=0x87c2ea0, return_value_ptr=0x0, this_ptr=0x0, 
    return_value_used=1, persistent=0)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/ext/imap/php_imap.c:803
#12 0x0815782b in zif_imap_open (ht=4, return_value=0x87c2ea0, return_value_ptr=0x0, this_ptr=0x0, 
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/ext/imap/php_imap.c:824
#13 0x0833af60 in zend_do_fcall_common_helper_SPEC (execute_data=0xba7817c0)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/Zend/zend_vm_execute.h:200
#14 0x08340bc1 in ZEND_DO_FCALL_SPEC_CONST_HANDLER (execute_data=0xba7817c0)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/Zend/zend_vm_execute.h:1679
#15 0x0833aaa5 in execute (op_array=0x87ba9d8)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/Zend/zend_vm_execute.h:92
#16 0x08313985 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/Zend/zend.c:1134
#17 0x082bbda9 in php_execute_script (primary_file=0xba785bf0)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/main/main.c:2007
#18 0x08394c18 in main (argc=1, argv=0xba785ce4)
    at /var/tmp/portage/dev-lang/php-5.2.6-r20/work/php5.2-200807101230/sapi/cgi/cgi_main.c:1919
 [2008-07-10 18:59 UTC]
The problem doesn't seems be the empty values, see:
 [2008-07-12 13:02 UTC] slim at inbox dot lv
With c-client-2006k empty $dsn in imap_open function cause 100% crash on latest php.
This IS the c-client bug, probably fixed in latest c-client releases - did not try them, can find nothing about this issue in c-client changelog.
 [2009-01-27 20:55 UTC]
c-client bugs are not PHP bugs.
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