Onderwerp: MySQL command-line client HTML injection vulnerability

MYSQL COMMAND-LINE CLIENT HTML INJECTION VULNERABILITY

Thomas Henlich <thomas@henlich.de>

DESCRIPTION

The mysql command-line client does not quote HTML special characters
like < in its output. This allows an attacker who is able to write data
into a table to hide or modify records in the output, and to inject
potentially dangerous code, e. g. Javascript to perform cross-site
scripting or cross-site request forgery attacks.

HOW TO REPRODUCE

$ mysql --html --execute "select '<a>'" ...
<TABLE BORDER=1><TR><TH><a></TH></TR><TR><TD><a></TD></TR></TABLE>

AFFECTED VERSIONS

All.

RESOLUTION

Users are advised to install the available patch from
http://bugs.mysql.com/bug.php?id=27884.

WORKAROUND

If another resolution is not feasible, users are advised to modify their
SELECT statements to filter out the characters < and &:

SELECT REPLACE(REPLACE(...,'&','&amp;'),'<','&lt;') AS ...;

This workaround is incompatible with the described resolution and should
be reversed after installation of the patch.

TIMELINE

2007-04-17 Opened bug on mysql.com
2008-05-01 Patch available

RESOURCES

The bug is filed on http://bugs.mysql.com/bug.php?id=27884.

This advisory is available from
http://www.henlich.de/it-security/my...-vulnerability.

Hi Thomas,

This bug was fixed in a MySQL release dated 01 May 2008. It is now 01
Oct 2008 - 5 months after the bug was released. So why exactly is this
news? Did I miss something here?

--

http://blog.hiltontravis.com/

Regards,

Hilton Travis Phone: +61 (0)7 3105 9101
(Brisbane, Australia) Phone: +61 (0)419 792 394
Manager, Quark IT http://www.quarkit.com.au
Quark Group http://www.quarkgroup.com.au

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> -----Original Message-----
> From: Thomas Henlich [mailto:thomas@henlich.de]
> Sent: Tuesday, 30 September 2008 6:30 PM
> To: bugtraq@securityfocus.com
> Subject: MySQL command-line client HTML injection vulnerability
>
> MYSQL COMMAND-LINE CLIENT HTML INJECTION VULNERABILITY
>
> Thomas Henlich <thomas@henlich.de>
>
> DESCRIPTION
>
> The mysql command-line client does not quote HTML special characters
> like < in its output. This allows an attacker who is able to write
data
> into a table to hide or modify records in the output, and to inject
> potentially dangerous code, e. g. Javascript to perform cross-site
> scripting or cross-site request forgery attacks.
>
> HOW TO REPRODUCE
>
> $ mysql --html --execute "select '<a>'" ...
> <TABLE BORDER=1><TR><TH><a></TH></TR><TR><TD><a></TD></TR></TABLE>
>
> AFFECTED VERSIONS
>
> All.
>
> RESOLUTION
>
> Users are advised to install the available patch from
> http://bugs.mysql.com/bug.php?id=27884.
>
> WORKAROUND
>
> If another resolution is not feasible, users are advised to modify
> their
> SELECT statements to filter out the characters < and &:
>
> SELECT REPLACE(REPLACE(...,'&','&amp;'),'<','&lt;') AS ...;
>
> This workaround is incompatible with the described resolution and
> should
> be reversed after installation of the patch.
>
> TIMELINE
>
> 2007-04-17 Opened bug on mysql.com
> 2008-05-01 Patch available
>
> RESOURCES
>
> The bug is filed on http://bugs.mysql.com/bug.php?id=27884.
>
> This advisory is available from
> http://www.henlich.de/it-security/my...e-client-html-
> injection-vulnerability.

> Hi Thomas,
>
> This bug was fixed in a MySQL release dated 01 May 2008. It is now 01
> Oct 2008 - 5 months after the bug was released. So why exactly is this
> news? Did I miss something here?


Not fixed in any version I know of.
Patch has been available for 5 months, but this has not gotten into any
production version (or am I wrong?)
Try this on your system:

mysql --html --execute "select '<a>'"

If you get this, then its not patched:
<TABLE BORDER=1><TR><TH><a></TH></TR><TR><TD><a></TD></TR></TABLE>

If you get this (on 5.1, a little different than 5.0) than its patched:
(note the escaped <a>)
--
Michael Scheidell, CTO
>|SECNAP Network Security
Winner 2008 Network Products Guide Hot Companies
FreeBSD SpamAssassin Ports maintainer



<TABLE
BORDER=1><TR><TH>&lt;a&gt;</TH></TR><TR><TD>&lt;a&gt;</TD></TR></TABLE>


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