## Summary
While fuzzing a stack based buffer overflow was found in libIEC61850 (the
open-source library for the IEC 61850 protocols) in prepareGooseBuffer in
goose/goose_publisher.c
## Steps to reproduce
$ ./goose_publisher_example crash_goosecr_stack_smash_overflow_aaaaaaaaa
Using interface crash_goosecr_stack_smash_overflow_aaaaaaaaa
*** stack smashing detected ***: <unknown> terminated
Aborted
$
## Debugging
(gdb) run crash_goosecr_stack_smash_overflow_aaaaaaaaa
Starting program:
/home/input0/Desktop/libiec61850/examples/goose_publisher/goose_publisher_example
crash_goosecr_stack_smash_overflow_aaaaaaaaa
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Using interface crash_goosecr_stack_smash_overflow_aaaaaaaaa
*** stack smashing detected ***: <unknown> terminated
Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1 0x00007ffff7805801 in __GI_abort () at abort.c:79
#2 0x00007ffff784e897 in __libc_message (action=action@entry=do_abort,
fmt=fmt@entry=0x7ffff797b988 "*** %s ***: %s terminated\n")
at ../sysdeps/posix/libc_fatal.c:181
#3 0x00007ffff78f9cd1 in __GI___fortify_fail_abort
(need_backtrace=need_backtrace@entry=false,
msg=msg@entry=0x7ffff797b966 "stack smashing detected") at
fortify_fail.c:33
#4 0x00007ffff78f9c92 in __stack_chk_fail () at stack_chk_fail.c:29
#5 0x000055555555a211 in Ethernet_getInterfaceMACAddress
(interfaceId=0x7fffffffdeee "crash_goosecr_stack_smash_overflow_aaaaaaaaa",
addr=0x7fffffffd91c "k_smas\377\377") at
hal/ethernet/linux/ethernet_linux.c:170
#6 0x00005555555594ee in prepareGooseBuffer (self=0x5555557637d0,
parameters=0x7fffffffd9ac,
interfaceID=0x7fffffffdeee
"crash_goosecr_stack_smash_overflow_aaaaaaaaa") at
src/goose/goose_publisher.c:168
#7 0x0000555555559293 in GoosePublisher_create (parameters=0x7fffffffd9ac,
interfaceID=0x7fffffffdeee
"crash_goosecr_stack_smash_overflow_aaaaaaaaa") at
src/goose/goose_publisher.c:72
#8 0x0000555555555387 in main (argc=2, argv=0x7fffffffdaa8) at
goose_publisher_example.c:52
(gdb) i r
rax 0x0 0
rbx 0x7fffffffd6b0 140737488344752
rcx 0x7ffff7803e97 140737345765015
rdx 0x0 0
rsi 0x7fffffffd410 140737488344080
rdi 0x2 2
rbp 0x7fffffffd840 0x7fffffffd840
rsp 0x7fffffffd410 0x7fffffffd410
r8 0x0 0
r9 0x7fffffffd410 140737488344080
r10 0x8 8
r11 0x246 582
r12 0x7fffffffd6b0 140737488344752
r13 0x1000 4096
r14 0x0 0
r15 0x30 48
rip 0x7ffff7803e97 0x7ffff7803e97 <__GI_raise+199>
eflags 0x246 [ PF ZF IF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
(gdb)
## src
Snip : src/goose/goose_publisher.c
{
GoosePublisher self = (GoosePublisher) GLOBAL_CALLOC(1, sizeof(struct
sGoosePublisher));
prepareGooseBuffer(self, parameters, interfaceID);
self->timestamp = MmsValue_newUtcTimeByMsTime(Hal_getTimeInMs());
GoosePublisher_reset(self);
return self;
}
Snip: src/goose/goose_publisher.c
if (interfaceID != NULL)
Ethernet_getInterfaceMACAddress(interfaceID, srcAddr);
else
Ethernet_getInterfaceMACAddress(CONFIG_ETHERNET_INTERFACE_ID, srcAddr);
## Reference
https://github.com/mz-automation/libiec61850/issues/83
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18957
Thank you
--
Regards
*Dhiraj Mishra.*GPG ID : 51720F56 | Finger Print : 1F6A FC7B 05AA CF29
8C1C ED65 3233 4D18 5172 0F56
