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Bug#31669 Buffer overflow in mysql_change_user()

Browse Source 
The problem is that when copying the supplied username and
database, no bounds checking is performed on the fixed-length
buffer. A sufficiently large (> 512) user string can easily
cause stack corruption. Since this API can be used from PHP
and other programs, this is a serious problem.

The solution is to increase the buffer size to the accepted
size in similar functions and perform bounds checking when
copying the username and database.


libmysql/libmysql.c:
  Increase the buffer size and perform bounds checking when copying
  the supplied arguments.
tests/mysql_client_test.c:
  Add test case for Bug#31669
This commit is contained in:
unknown
2007-10-23 09:05:39 -03:00
parent d927461052
commit 22e972ffeb
2 changed files with 98 additions and 3 deletions
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94
tests/mysql_client_test.c
View File

@ -15857,6 +15857,99 @@ static void test_bug29306()
DBUG_VOID_RETURN;
}
/**
Bug#31669 Buffer overflow in mysql_change_user()
*/
#define LARGE_BUFFER_SIZE 2048
static void test_bug31669()
{
int rc;
static char buff[LARGE_BUFFER_SIZE+1];
#ifndef EMBEDDED_LIBRARY
static char user[USERNAME_LENGTH+1];
static char db[NAME_LEN+1];
static char query[LARGE_BUFFER_SIZE*2];
#endif
DBUG_ENTER("test_bug31669");
myheader("test_bug31669");
rc= mysql_change_user(mysql, NULL, NULL, NULL);
DIE_UNLESS(rc);
rc= mysql_change_user(mysql, "", "", "");
DIE_UNLESS(rc);
memset(buff, 'a', sizeof(buff));
rc= mysql_change_user(mysql, buff, buff, buff);
DIE_UNLESS(rc);
rc = mysql_change_user(mysql, opt_user, opt_password, current_db);
DIE_UNLESS(!rc);
#ifndef EMBEDDED_LIBRARY
memset(db, 'a', sizeof(db));
db[NAME_LEN]= 0;
strxmov(query, "CREATE DATABASE IF NOT EXISTS ", db, NullS);
rc= mysql_query(mysql, query);
myquery(rc);
memset(user, 'b', sizeof(user));
user[USERNAME_LENGTH]= 0;
memset(buff, 'c', sizeof(buff));
buff[LARGE_BUFFER_SIZE]= 0;
strxmov(query, "GRANT ALL PRIVILEGES ON *.* TO '", user, "'@'%' IDENTIFIED BY "
"'", buff, "' WITH GRANT OPTION", NullS);
rc= mysql_query(mysql, query);
myquery(rc);
rc= mysql_query(mysql, "FLUSH PRIVILEGES");
myquery(rc);
rc= mysql_change_user(mysql, user, buff, db);
DIE_UNLESS(!rc);
user[USERNAME_LENGTH-1]= 'a';
rc= mysql_change_user(mysql, user, buff, db);
DIE_UNLESS(rc);
user[USERNAME_LENGTH-1]= 'b';
buff[LARGE_BUFFER_SIZE-1]= 'd';
rc= mysql_change_user(mysql, user, buff, db);
DIE_UNLESS(rc);
buff[LARGE_BUFFER_SIZE-1]= 'c';
db[NAME_LEN-1]= 'e';
rc= mysql_change_user(mysql, user, buff, db);
DIE_UNLESS(rc);
db[NAME_LEN-1]= 'a';
rc= mysql_change_user(mysql, user, buff, db);
DIE_UNLESS(!rc);
rc= mysql_change_user(mysql, user + 1, buff + 1, db + 1);
DIE_UNLESS(rc);
rc = mysql_change_user(mysql, opt_user, opt_password, current_db);
DIE_UNLESS(!rc);
strxmov(query, "DROP DATABASE ", db, NullS);
rc= mysql_query(mysql, query);
myquery(rc);
strxmov(query, "DELETE FROM mysql.user WHERE User='", user, "'", NullS);
rc= mysql_query(mysql, query);
myquery(rc);
DIE_UNLESS(mysql_affected_rows(mysql) == 1);
#endif
DBUG_VOID_RETURN;
}
/*
Read and parse arguments and MySQL options from my.cnf
*/
@ -16149,6 +16242,7 @@ static struct my_tests_st my_tests[]= {
{ "test_bug27592", test_bug27592 },
{ "test_bug29948", test_bug29948 },
{ "test_bug29306", test_bug29306 },
{ "test_bug31669", test_bug31669 },
{ 0, 0 }
};