Serverview 3.0 - Insecure File Permissions

Full Version: Serverview 3.0 - Insecure File Permissions

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qcred11

Sep 7 2004, 05:15 PM

QUOTE

date: 06.09.2004
author: l0om - l0om [at] excluded d0t org
product: serverview
problem: insecure file permissions
version: 3.0???

serverview is a server management product from fujitsu siemens
which is shipped with every PRIMERGY server.
it is based on snmp an let you view and set values in your MIB
tree.

In /usr/share/snmp/mibs you have stored files which build your
MIB tree.

example
#######

SNMPv2-MIB.txt
--includes:

sysDescr OBJECT-TYPE
SYNTAX DisplayString (SIZE (0..255))
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"A textual description of the entity. This value should
include the full name and version identification of the
system's hardware type, software operating-system, and
networking software."
::= { system 1 }

sysObjectID OBJECT-TYPE
SYNTAX OBJECT IDENTIFIER
MAX-ACCESS read-only
[...]

#######

the ".index" which is in the same directory includes:

RFC1398-MIB SRVMAGT-ETHER.TXT
UCD-DISKIO-MIB UCD-DISKIO-MIB.txt
SNI-HD-MIB SRVMAGT-HD.TXT
SNI-MYLEX-MIB SRVMAGT-MYLEX.TXT
SNMP-NOTIFICATION-MIB SNMP-NOTIFICATION-MIB.txt
IPV6-TC IPV6-TC.txt
SMUX-MIB SMUX-MIB.txt
EtherLike-MIB EtherLike-MIB.txt
SNMPv2-SMI SNMPv2-SMI.txt
SNI-SERVER-CONTROL-MIB SRVMAGT-SC.TXT
UCD-DEMO-MIB UCD-DEMO-MIB.txt
SNMP-COMMUNITY-MIB SNMP-COMMUNITY-MIB.txt
IPV6-ICMP-MIB IPV6-ICMP-MIB.txt
SNMPv2-MIB SNMPv2-MIB.txt

[...]

in the .index the pathes to the MIB structure files can be found.

now to the dirty part-
hiding does not prevent from wirting...

badass@box:/usr/share/snmp/mibs> ls -al .index
-rw-rw-rw- 1 root root 1824 20xx-xx-xx xx:xx .index

therefore we can simply DoS the service with deleting the values in .index
but we also could change a MIB structure file path to eg.

SNMPv2-MIB ../../../../../../../tmp/MY-SNMPv2-MIB.txt

what means that we can currupt the whole MIB tree.
with some knowledge on snmp this could end terrible...

the version should be some 3.0 (iam not totaly sure :/).
just check your .index and chmod it to 664.

Source: http://www.securitytracker.com/alerts/2004/Sep/1011168.html

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