kamailio 3.1.0 crash on ssl-dos attack - sr-users

23 Nov 2011

Hi All,

Kamailio is resetting when we do TLS renegotiation dos attack using the
tool available at  http://www.thc.org/thc-ssl-dos/.

Anybody looked at this issue? How we could resolve it. Any idea?

The core generated for 3 pid's as below

Pid 1:

Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 120 -f
/etc/kamailio/kamailio.cfg'.
Program terminated with signal 11, Segmentation fault.
#0  atomic_inc_int () at atomic/atomic_x86.h:225
(gdb) bt
#0  atomic_inc_int () at atomic/atomic_x86.h:225
#1  cfg_update_local () at cfg/cfg_struct.h:228
#2  timer_main () at timer.c:994
#3  0x080b0579 in main_loop () at main.c:1632
#4  0x080b1be4 in main (argc=9, argv=0xbfd61e54) at main.c:2446

Pid 2:

Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 120 -f
/etc/kamailio/kamailio.cfg'.
Program terminated with signal 11, Segmentation fault.
#0  0x0819bfe8 in qm_insert_free (qm=0xaf6c5000, p=0xb05eec30,
file=0xb6fb4140 "tls: tls_init.c", func=0xb6fb4ce0 "ser_free",
line=296)
    at mem/q_malloc.c:184
184                     if (frag->size <= f->size) break;
(gdb) bt
#0  0x0819bfe8 in qm_insert_free (qm=0xaf6c5000, p=0xb05eec30,
file=0xb6fb4140 "tls: tls_init.c", func=0xb6fb4ce0 "ser_free",
line=296)
    at mem/q_malloc.c:184
#1  qm_free (qm=0xaf6c5000, p=0xb05eec30, file=0xb6fb4140 "tls:
tls_init.c", func=0xb6fb4ce0 "ser_free", line=296) at mem/q_malloc.c:518
#2  0xb6f95404 in ser_free (ptr=0xb05eec30) at tls_init.c:296
#3  0xb732e9ba in CRYPTO_free (str=0xb05eec30) at mem.c:391
#4  0xb7330bee in int_new_ex_data (class_index=5, obj=0xbfd414f4,
ad=0xbfd41574) at ex_data.c:440
#5  0xb7330443 in CRYPTO_new_ex_data (class_index=5, obj=0xbfd414f4,
ad=0xbfd41574) at ex_data.c:575
#6  0xb73dfde3 in X509_STORE_CTX_init (ctx=0xbfd414f4, store=0xafd8b3d0,
x509=0xafe08ff0, chain=0x0) at x509_vfy.c:2114
#7  0xb74b0f31 in ssl3_output_cert_chain (s=0xb0553a10, x=0xafe08ff0) at
s3_both.c:349
#8  0xb74a4728 in ssl3_send_server_certificate (s=0xb0553a10) at
s3_srvr.c:3034
#9  0xb74a5879 in ssl3_accept (s=0xb0553a10) at s3_srvr.c:353
#10 0xb74afa8f in ssl3_read_bytes (s=0xb0553a10, type=23, buf=0xb0ad44ec
"", len=4095, peek=0) at s3_pkt.c:1266
#11 0xb74ac9c9 in ssl3_read_internal (s=0xb0553a10, buf=0xb0ad44ec,
len=4095, peek=0) at s3_lib.c:3265
#12 0xb74c24a9 in SSL_read (s=0xb0553a10, buf=0xb0ad44ec, num=4095) at
ssl_lib.c:954
#13 0xb6fad1c3 in tls_read_f (c=0xb0ad431c, flags=0xbfd619c4) at
tls_server.c:1058
#14 0x08171c0e in tcp_read_headers (c=0xb0ad431c, read_flags=0xbfd619c4) at
tcp_read.c:406
#15 0x08171db8 in tcp_read_req (con=0xb0ad431c, bytes_read=0xbfd619cc,
read_flags=0xbfd619c4) at tcp_read.c:885
#16 0x08172f67 in handle_io (fm=<value optimized out>, events=1, idx=<value
optimized out>) at tcp_read.c:1234
#17 0x0817583b in io_wait_loop_epoll (unix_sock=89) at io_wait.h:1092
#18 tcp_receive_loop (unix_sock=89) at tcp_read.c:1345
#19 0x0816e2e9 in tcp_init_children () at tcp_main.c:4867
#20 0x080affb1 in main_loop () at main.c:1646
#21 0x080b1be4 in main (argc=9, argv=0xbfd61e54) at main.c:2446

Pid 3:

Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 120 -f
/etc/kamailio/kamailio.cfg'.
Program terminated with signal 11, Segmentation fault.
#0  0xb76c9e7c in memmove () from /lib/libc.so.6
(gdb) bt
#0  0xb76c9e7c in memmove () from /lib/libc.so.6
#1  0x081724e7 in tcp_read_req (con=0xb022c8f0, bytes_read=0xbfd619cc,
read_flags=0xbfd619c4) at tcp_read.c:1026
#2  0x08172f67 in handle_io (fm=<value optimized out>, events=1, idx=<value
optimized out>) at tcp_read.c:1234
#3  0x0817583b in io_wait_loop_epoll (unix_sock=93) at io_wait.h:1092
#4  tcp_receive_loop (unix_sock=93) at tcp_read.c:1345
#5  0x0816e2e9 in tcp_init_children () at tcp_main.c:4867
#6  0x080affb1 in main_loop () at main.c:1646
#7  0x080b1be4 in main (argc=9, argv=0xbfd61e54) at main.c:2446