MySQL 4.1.20 リリース★セキュリティパッチ
投稿日時 2006-6-1 4:03:17 | トピック： MySQL
| MySQL 4.1.20 がリリースされました。
http://dev.mysql.com/downloads/mysql/4.1.html
このバージョンでは、一点のセキュリティーホール （SQLインジェクション） に対する修正のみがなされています。
詳細は以下文書を参照ください。
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以下チェンジログおよびセキュリティーホール詳細情報
■バグ修正
* Security fix: An SQL-injection security hole has been found in multibyte encoding processing. The bug was in the server, incorrectly parsing the string escaped with mysql_real_escape().
This vulnerability was discovered and reported by Josh Berkus <josh@postgresql.org> and Tom Lane <tgl@sss.pgh.pa.us> as part of the inter-project security collaboration of the OSDB consortium.
■Discussion
An SQL-injection security hole has been found in multibyte encoding
processing. An SQL-injection security hole can include a situation
whereby when inserting user supplied data into a database, the user
might inject his own SQL statements that the server will execute.
With regards to this vulnerability discovered, when character set
unaware escaping is used (e.g., addslashes() in PHP), it is possible
to bypass it in some multibyte character sets (e.g., SJIS, BIG5 and
GBK). As a result, a function like addslashes() is not able to
prevent SQL injection attacks. It is impossible to fix this on the
server side. The best solution is for applications to use character
set aware escaping offered in a function like mysql_real_escape().
However, a bug has been detected in how the server parses the output
of mysql_real_escape(). As a result, even when the character set
aware function mysql_real_escape() was used, SQL injection was
possible. This bug has been fixed.
■Workarounds
One can use NO_BACKSLASH_ESCAPES mode as a workaround for a bug in
mysql_real_escape_string(), if you cannot upgrade your server for
some reason. It will enable SQL standard compatibility mode, where
backslash is not considered a special character. To set this mode,
enter the follow SQL statement on the server:
SET sql_mode='NO_BACKSLASH_ESCAPES';
You can also set it globally for all clients, using
SET GLOBAL sql_mode='NO_BACKSLASH_ESCAPES';
It can also be enabled automatically when the server starts by using the
command-line option --sql-mode=NO_BACKSLASH_ESCAPES or by setting
sql-mode=NO_BACKSLASH_ESCAPES in the server options file
(e.g., my.cnf or my.ini, depending on your system).
Backslash then becomes an ordinary character like any other. The
result will be that queries will fail.
This mode was implemented in MySQL version 5.0.1.
■Solution
This vulnerability of mysql_real_escape_string() is fixed in the
latest certified binary releases of 4.1.16a and 5.0.17c, as well as in
MySQL versions 4.1.20, 5.0.22, and 5.1.11-beta (not yet released).
A function which is unaware of character sets (e.g., addslashes() in
PHP) should not be used for escaping. Rather, use one which is character
set aware, like mysql_real_escape_string().
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