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Bug #53371: COM_FIELD_LIST can be abused to bypass table level grants.

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This is the 5.1 merge and extension of the fix.
The server was happily accepting paths in table name in all places a table
name is accepted (e.g. a SELECT). This allowed all users that have some 
privilege over some database to read all tables in all databases in all
mysql server instances that the server file system has access to.
Fixed by :
1. making sure no path elements are allowed in quoted table name when
constructing the path (note that the path symbols are still valid in table names
when they're properly escaped by the server).
2. checking the #mysql50# prefixed names the same way they're checked for
path elements in mysql-5.0.
This commit is contained in:
Georgi Kodinov
2010-05-04 17:03:28 +03:00
parent 83fb8a7770 6ae9c70109
commit 0f26a0533b
9 changed files with 138 additions and 8 deletions
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14
sql/sql_table.cc
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@ -435,7 +435,21 @@ uint tablename_to_filename(const char *from, char *to, uint to_length)
DBUG_PRINT("enter", ("from '%s'", from));
if ((length= check_n_cut_mysql50_prefix(from, to, to_length)))
{
/*
Check if the name supplied is a valid mysql 5.0 name and
make the name a zero length string if it's not.
Note that just returning zero length is not enough :
a lot of places don't check the return value and expect
a zero terminated string.
*/
if (check_table_name(to, length, TRUE))
{
to[0]= 0;
length= 0;
}
DBUG_RETURN(length);
}
length= strconvert(system_charset_info, from,
&my_charset_filename, to, to_length, &errors);
if (check_if_legal_tablename(to) &&