[UNIX] SQL Injection Vulnerability in FuzzyMonkey My Classifieds SQL

From: SecuriTeam (support_at_securiteam.com)
Date: 10/22/03

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Date: 22 Oct 2003 11:07:57 +0200

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      SQL Injection Vulnerability in FuzzyMonkey My Classifieds SQL
    ------------------------------------------------------------------------

    SUMMARY

     <http://fuzzymonkey.org/newfuzzy/software/perl/classifieds/readme.html>
    My Classifieds SQL is a "Perl/CGI/MySQL script which will quickly and
    easily allow the hosting of a classifieds forum on a website. Users can
    browse the ads, but must log in with their email and password before being
    allowed to post an ad".

    My Classifieds SQL is vulnerable to a SQL injection attack. The problem is
    due to improper sensitization of user input for the $emailvariable. A
    remote attacker could insert arbitrary SQL code in the $emailvariable. The
    vulnerability allows the passwords of the users to be written into a file
    and made world readable.

    DETAILS

    Vulnerable Systems:
     * FuzzyMonkey My Classifieds SQL version 2.11

    Immune Systems:
     * FuzzyMonkey My Classifieds SQL version 2.13

    Exploit:
    If the value of $email is aaa@aaa.com' OR 1=1 INTO
    OUTFILE'/<directory-path>/pass.txt, the SQL request becomes:
    select passmd5 from people where email=' aaa@aaa.com' OR 1=1 INTO
    OUTFILE'/<directory-path>/pass.txt'

    Resulting in the passwords of the users being written into the file
    pass.txt.

    Impact:
    A malicious attacker can obtain passwords of users.

    Solution:
    Upgrade to version 2.13, available from:
    <http://www.fuzzymonkey.org/files/myclassifiedssql-2.13.tar.gz>
    http://www.fuzzymonkey.org/files/myclassifiedssql-2.13.tar.gz

    Vulnerability History:
    15 Oct 2003 Identified by Ezhilan of Sintelli
    15 Oct 2003 Issue disclosed to FuzzyMonkey (Erin)
    16 Oct 2003 Vulnerability confirmed by Erin
    18 Oct 2003 Fix available
    18 Oct 2003 Sintelli confirms vulnerability has been addressed
    18 Oct 2003 Sintelli Public Disclosure

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:sintraq at sintelli.com>
    Sintelli SINTRAQ
    The original article can be found at:
    <http://www.sintelli.com/adv/sa-2003-04-myclassified.pdf>
    http://www.sintelli.com/adv/sa-2003-04-myclassified.pdf

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