#########################################################
xmysqladmin insecure temporary file creation
Vendor: Gilbert Therrien gilbert@private or mysql@private
Advisory: http://www.zataz.net/adviso/xmysqladmin-05292005.txt
Vendor informed: yes
Exploit available: yes
Impact : low
Exploitation : low
#########################################################
xmysqladmin contain a security flaw wich could allow a malicious
local user to delete arbitrary files with the right off the user
how use xmysqladmin or to get sensible informations
(content off a database)
During the drop off a database, xmysqladmin drop the database and create
a tar.gz
inside /tmp without checking if the file exist already.
The exploitation require that the malicious local user no wich database
gonna be deleted.
##########
Versions:
##########
xmysqladmin <= 1.0
##########
Solution:
##########
In Makefile :
BACKUPDIR = .
I think that upstream should check if the file already exist or not
before creating it.
To prevent symlink attack use kernel patch such as grsecurity
#########
Timeline:
#########
Discovered : 2005-05-24
Vendor notified : 2005-05-29
Vendor response : no reponse
Vendor fix : no fix
Disclosure : 2005-05-29
#####################
Technical details :
#####################
Vulnerable code :
-----------------
In Makefile :
BACKUPDIR = /tmp
In createDropDB.c : begin line 94
void dropdb_drop(FL_OBJECT *obj, long data)
{
char *cmd;
if(!fl_show_question("WARNING!!!\nThis database will be delete.\nDo
you want to continue?", 0))
return;
if(!fl_show_question("WARNING!!!\nThis database will be delete.\nAre
you sure?", 0))
return;
cmd = (char *) malloc(2048);
if(!cmd) return;
sprintf(cmd, "%s %s/%s.tar%s %s%s/*", BACKUP, BACKUPDIR,
g_dropdb_dbfname,
BACKUPSUFFIX, Setup.datapath, g_dropdb_dbfname);
fl_show_command_log(FL_TRANSIENT);
fl_exe_command(cmd, 1);
free(cmd);
{
MYSQL connection;
if(g_mysql_connect(&connection, Setup.host, Setup.user,
Setup.password))
{
if(mysql_drop_db(&connection, g_dropdb_dbfname))
{
fl_show_alert(mysql_error(&connection),"","",0);
}
else
{
fl_show_message("The database",g_dropdb_dbfname,"has been
destroyed");
}
mysql_close(&connection);
}
else
{
fl_show_alert("Cannot connect to server","","",0);
}
}
#########
Related :
#########
Bug report : http://bugs.gentoo.org/show_bug.cgi?id=93792
#####################
Credits :
#####################
Eric Romang (eromang@private - ZATAZ Audit)
Thxs to Gentoo Security Team. (Taviso, jaervosz, solar, etc.)
This archive was generated by hypermail 2.1.3 : Thu Jun 09 2005 - 08:26:24 PDT