Bug 718289 - mysql: DoS (crash) by processing REPAIR TABLE table USE_FRM on a MERGE table (MySQL bug#46339)
Summary: mysql: DoS (crash) by processing REPAIR TABLE table USE_FRM on a MERGE table ...
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 717721
TreeView+ depends on / blocked
 
Reported: 2011-07-01 17:01 UTC by Jan Lieskovsky
Modified: 2019-09-29 12:45 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-02-14 14:33:24 UTC

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Description Jan Lieskovsky 2011-07-01 17:01:58 UTC 
It was found that MySQL server did not properly handle processing of SQL REPAIR TABLE table USE_FRM statements used on a MERGE table. A remote attacker, valid SQL user could use this flaw to cause denial of service (mysqld daemon crash).

References:
[1] http://dev.mysql.com/doc/refman/5.1/en/news-5-1-52.html
[2] http://bugs.mysql.com/bug.php?id=46339

Note:
On Red Hat Enterprise Linux systems exploitation of this issue would lead only
to temporary denial of service, since mysqld daemon gets automatically
restarted upon encountering a crash.
Comment 1 Jan Lieskovsky 2011-07-01 17:03:05 UTC 
Public PoC from [2]:
====================

drop table if exists m1,t1;
create table t1(a int)engine=myisam;
create table m1(a int)engine=merge union=(t1) insert_method=last;
lock table m1 read;
repair table m1 use_frm;
Comment 2 Jan Lieskovsky 2011-07-01 17:03:58 UTC 
This issue did NOT affect the versions of the mysql package, as shipped with
Red Hat Enterprise Linux 4, 5, or 6.

--

This issue did NOT affect the versions of the mysql package, as shipped with
Fedora release of 14 and 15.
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