date: 06.09.2004

author: l0om - l0om [at] excluded d0t org - www.excluded.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.

greets @ www.excluded.org

murf, john, detach and all guys iam chattin with :)

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