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Date: Tue, 18 Oct 2016 22:56:18 +0200
From: Gsunde Orangen <>
Subject: Re: CVE-2016-6662 - MySQL Remote Root Code Execution /
 Privilege Escalation ( 0day )

Dawid meanwhile updated his post [1] to reflect that the fixes for
CVE-2016-6662 were added in 5.5.52/5.6.33/5.7.15.
... But today Oracle states that those versions were still affected [2],
thus the fix releases are 5.5.53/5.6.34/5.7.16.

So which one is correct? Based on the changelogs I assume [1].

And btw, Dawid: what happened with CVE-2016-6663? Still not public yet?



On 12.09.2016, 16:45 Fried Wil wrote:
> Hi Dawid,
> Affected MySQL versions (including the latest):
> <= 5.7.15
> <= 5.6.33
> <= 5.5.52
> Is your issue related to MySQL bugids fixed in 5.5.52/5.6.33/5.7.15 ?
> Changes in MySQL 5.5.52 (2016-09-06):
> - For mysqld_safe, the argument to --malloc-lib now must be one of the
> directories /usr/lib, /usr/lib64, /usr/lib/i386-linux-gnu, or
> /usr/lib/x86_64-linux-gnu. In addition, the --mysqld and
> --mysqld-version options can be used only on the command line and not
> in an option file. (Bug #24464380)
> - Privilege escalation was possible by exploiting the way REPAIR TABLE
> used temporary files. (Bug #24388746)
> - It was possible to write log files ending with .ini or .cnf that
> later could be parsed as option files. The general query log and slow
> query log can no longer be written to a file ending with .ini or .cnf.
> (Bug #24388753)
> Thanks
> On Mon, Sep 12, 2016 at 6:58 AM, Dawid Golunski <> wrote:
>> Hi Alexander,
>> I was just going to reply to your email you sent earlier.
>> Thanks for the feedback. I actually updated the introduction after your email.
>> The advisory focuses on CVE-2016-6662 vulnerability which lets users
>> to modify/create my.cnf files. A fix would prevent users from writing
>> to my.cnf config.
>> And yes there's a typo in the last paragraph made after a few
>> sleepless nights ;) I've fixed it now.
>> The CVE-2016-6663 is not public yet. I refer to it in the advisory to
>> give some heads up in case someone wanted to discard this issue based
>> on reasoning that FILE privs are not common and that they will never
>> be pwned etc. It'll soon be published then it'll be clear what this
>> CVEID is about ;)
>> Cheers.
>> On Mon, Sep 12, 2016 at 7:35 AM, Solar Designer <> wrote:
>>> On Mon, Sep 12, 2016 at 06:09:10AM -0300, Dawid Golunski wrote:
>>>> Vulnerability: MySQL Remote Root Code Execution / Privilege Escalation 0day
>>>> CVE: CVE-2016-6662
>>>> Severity: Critical
>>>> Affected MySQL versions (including the latest):
>>>> <= 5.7.15
>>>> <= 5.6.33
>>>> <= 5.5.52
>>> Thank you for posting this.  For archival, and to comply with
>>> oss-security content guidelines, I am attaching a text/plain version of
>>> the above advisory (which includes a lot of detail not in your posting).
>>> Also, to add detail on the disclosure timeline: Dawid brought this to
>>> the distros list yesterday (Sunday).
>>> As I had pointed out in a reply on distros, it is not entirely clear
>>> what exact issue the CVE-2016-6662 identifier is for.  The advisory
>>> talks about multiple sysadmin practices, packaging issues, dangerous
>>> features of MySQL, and finally of safe_mysqld including the data
>>> directory in its search path for my.cnf.  I guess it would be most
>>> reasonable to have the CVE ID refer only to the latter aspect, but
>>> confirmation/clarification is needed.  As it is, it's unclear from the
>>> advisory what exact "vulnerabilities were patched by PerconaDB and
>>> MariaDB vendors" (the advisory says so), and it is unclear what Oracle
>>> and distros "fixing" CVE-2016-6662 would mean.
>>> Also, in this paragraph I guess the advisory wanted to refer to the
>>> upcoming CVE-2016-6663 (I have no idea what that issue is, beyond what
>>> the advisory says), like it does in a few other places:
>>> "It is worth to note that attackers could use one of the other vulnerabilities discovered
>>> by the author of this advisory which has been assigned a CVEID of CVE-2016-6662 and is
>>> pending disclosure. The undisclosed vulnerability makes it easy for certain attackers to
>>> create /var/lib/mysql/my.cnf file with arbitrary contents without the FILE privilege
>>> requirement."
>>> Alexander
>> --
>> Regards,
>> Dawid Golunski

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