PHP :: Bug #24150 :: imap_fetch_overview crashes with a very big address in From:

Bug #24150

imap_fetch_overview crashes with a very big address in From:

Submitted:

2003-06-12 09:23 UTC

Modified:

2003-06-16 12:43 UTC

Votes:	1
Avg. Score:	5.0 ± 0.0
Reproduced:	1 of 1 (100.0%)
Same Version:	1 (100.0%)
Same OS:	1 (100.0%)

From:

nuno at co dot sapo dot pt

Assigned:

iliaa (profile)

Status:

Closed

Package:

IMAP related

PHP Version:

4.3.2

OS:

Linux 2.4.x

Private report:

CVE-ID:

None

View Developer Edit

[2003-06-12 09:23 UTC] nuno at co dot sapo dot pt

Description:
------------
I reproduced this bug with php 4.3.2 and 4.2.3, so this is not a new problem.

If you imap_fetch_overview() a mailbox with a message with an huge address in the To: field, php crashes.

The message on which I discovered this bug has the following From: field:

From: ctqbscittqlxpghclcooontnvlqgwnkheymoitwvkkyqykkwsqdrryumoreloyhnjjqdxtmcrcyjmqonmvmiqndryislkqsdyxeruecmggxgiwrydhyqxfeqkxqteyqjkhbvynhlijkwedtcqv
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[2003-06-12 09:59 UTC] sniper@php.net

Thank you for this bug report. To properly diagnose the problem, we
need a backtrace to see what is happening behind the scenes. To
find out how to generate a backtrace, please read
http://bugs.php.net/bugs-generating-backtrace.php

Once you have generated a backtrace, please submit it to this bug
report and change the status back to "Open". Thank you for helping
us make PHP better.

[2003-06-16 08:33 UTC] nuno at co dot sapo dot pt

(gdb) bt
#0  0x80ed07a in zif_imap_fetch_overview (ht=1717791080, return_value=0x6a756479, this_ptr=0x636e626b, return_value_used=1785165933)
    at /servers/sources/php-4.3.2/ext/imap/php_imap.c:224
#1  0x65796866 in ?? ()
Cannot access memory at address 0x736f6a70.
(gdb)

[2003-06-16 08:40 UTC] sniper@php.net

Did you configure PHP with --enable-debug??
If not, please do it. And remember to delete config.cache before running configure again.

Also, which c-client version are you using?

[2003-06-16 09:09 UTC] nuno at co dot sapo dot pt

Checking imap_fetch_overview() function source code (php_imap.c, line 2666) we can see that the address variable is an array with a length of MAILTMPLEN (defined in phplib as 1024, I think).

Well, this from address has around 10k length, so seems obvious what's happening.

Why doesn't php truncate the from address as it does in imap_headerinfo() ?

Note: This is just speculation. I'm not really sure about what I'm talking about since I never looked at the php sources, and don't code C for some years now. :)

[2003-06-16 09:28 UTC] nuno at co dot sapo dot pt

No, I didn't recompile it with --enable-debug.
With PHP 4.3.2 I used an hacked c-client.

*But* before I submitted the bug I tryed it in my laptop which runs PHP 4.2.3 installed via apt-get and it also segfaulted.

$ dpkg -l php* | grep IMAP
ii  php4-imap      4.2.3-9        IMAP module for php4

$ dpkg -S /usr/include/c-client/mail.h
libc-client2001-dev: /usr/include/c-client/mail.h

[2003-06-16 12:43 UTC] iliaa@php.net

This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.

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