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Date: Mon, 3 Oct 2022 12:11:20 -0400
From: Alex Gaynor <alex.gaynor@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: MySQL Cluster 8.0.30 overflow
Was this previously disclosed to the MySQL team (Oracle, I suppose)
and is it fixed upstream, or is this the initial disclosure?
Alex
On Mon, Oct 3, 2022 at 12:08 PM Evgeny Legerov <admin@...ndisco.cc> wrote:
>
> Hi,
>
> There is a heap overflow in ndbd.
>
> Bug details:
> void Dbdih::execSTART_MECONF(Signal* signal)
> {
> jamEntry();
> StartMeConf * const startMe = (StartMeConf *)&signal->theData[0];
> Uint32 nodeId = startMe->startingNodeId;
> [1] const Uint32 startWord = startMe->startWord;
>
> CRASH_INSERTION(7130);
> ndbrequire(nodeId == cownNodeId);
> bool v2_format = true;
> Uint32 cdata_size_in_words;
> [2] if
> (ndbd_send_node_bitmask_in_section(getNodeInfo(cmasterNodeId).m_version))
> {
> jam();
> ndbrequire(signal->getNoOfSections() == 1);
> SegmentedSectionPtr ptr;
> SectionHandle handle(this, signal);
> ndbrequire(handle.getSection(ptr, 0));
> ndbrequire(ptr.sz <= (sizeof(cdata)/4));
> copy(cdata, ptr);
> cdata_size_in_words = ptr.sz;
> releaseSections(handle);
> }
> else
> {
> jam();
> v2_format = false;
> [3] arrGuard(startWord + StartMeConf::DATA_SIZE, sizeof(cdata)/4);
> for(Uint32 i = 0; i < StartMeConf::DATA_SIZE; i++)
> {
> [4] cdata[startWord+i] = startMe->data[i];
> }
>
>
> }
>
> We control the contents of signal->theData buffer.
> If master node is an old 7.6 version, which is still supported, check on
> line #2 fails and we go to line #3.
> This check can be easily bypassed if startWord is negative.
> On line #4 we have nice heap overflow.
>
> Instructions and code to reproduce -
> https://github.com/ivd38/mysql_overflow1
>
>
> regards,
>
> -e
>
--
All that is necessary for evil to succeed is for good people to do nothing.
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