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.
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
None
C
There is no impact on the confidentiality of the system; the attacker does not gain the ability to read any 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
None
A
There is no impact on the availability of the system; the attacker does not have the ability to disrupt access to or use of the system.
phpBB 3.0.13 Open Redirect under chromeSecurity: An insufficient check allowed users of the Google Chrome browser to be redirected to external domains (e.g. on login). Thanks to Mathias Karlsson (avlidienbrunn) for bringing this to our attention.
https://wiki.phpbb.com/Release_Highlights/3.0.14
The patch seems to be this one:
https://github.com/phpbb/phpbb/commit/1a3350619f428d9d69d196c52128727e27ef2f04
phpBB/includes/functions.php
@@ -2492,7 +2492,7 @@ function redirect($url, $return = false, $disable_cd_check = false)
// Attention: only able to redirect within the same domain if $disable_cd_check is false (yourdomain.com -> www.yourdomain.com will not work)
if (!$disable_cd_check && $url_parts['host'] !== $user->host)
{
-$url = generate_board_url();
+trigger_error('Tried to redirect to potentially insecure url.', E_USER_ERROR);
}
}
else if ($url[0] == '/')
@@ -2579,6 +2579,12 @@ function redirect($url, $return = false, $disable_cd_check = false)
}
}
+// Make sure we don't redirect to external URLs
+if (!$disable_cd_check && strpos($url, generate_board_url(true) . '/') !== 0)
+{
+trigger_error('Tried to redirect to potentially insecure url.', E_USER_ERROR);
+}
+
// Make sure no linebreaks are there... to prevent http response splitting for PHP < 4.4.2
if (strpos(urldecode($url), "\n") !== false || strpos(urldecode($url), "\r") !== false || strpos($url, ';') !== false)
{
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