[sr-dev] kamailio 3.1.0 crash on ssl-dos attack
Jijo
realjijo at gmail.com
Tue Dec 6 00:56:44 CET 2011
Hello
I tested using 3.2 and i got the same error. I couldn't get the memlog,
when i enable , the system doesn't come up.
The latest update from http://www.thc.org/thc-ssl-dos/ says that
"2011-OCT-24 UPDATE:
SSL-DOS released. Some organizations already found out about this release a
while ago and mistakenly identified it as an SSL-RENEGOTIATION BUG. This is
not true. The tool can be modified to work without SSL-RENEGOTIATION by
just establishing a new TCP connection for every new handshake. "
So this issue could happen if we do TCP connection for every new TLS
connection with renegotiation. I believe this could be fixed if we could
block based on max active TLS connections, probably a similar flag for max
TLS connections like "tcp_max_connections"
Core was generated by `/usr/sbin/kamailio -u swrun -g sw -m 160 -f
/etc/kamailio/kamailio.cfg'.
Program terminated with signal 11, Segmentation fault.
#0 0xb61cc2e3 in ?? () from /usr/lib/kamailio/modules/tls.so
(gdb) bt
#0 0xb61cc2e3 in ?? () from /usr/lib/kamailio/modules/tls.so
#1 0xb65199fd in CRYPTO_lock () from /lib/libcrypto.so.1.0.0
#2 0xb658c133 in ?? () from /lib/libcrypto.so.1.0.0
#3 0xb658d240 in RAND_add () from /lib/libcrypto.so.1.0.0
#4 0xb6690d50 in ssl3_accept () from /lib/libssl.so.1.0.0
#5 0xb669bd2f in ssl3_read_bytes () from /lib/libssl.so.1.0.0
#6 0xb66989b9 in ?? () from /lib/libssl.so.1.0.0
#7 0xb66ae499 in SSL_read () from /lib/libssl.so.1.0.0
#8 0xb61e1e33 in tls_read_f () from /usr/lib/kamailio/modules/tls.so
#9 0x08177036 in tcp_read_headers ()
#10 0x081771f6 in tcp_read_req ()
#11 0x08178480 in ?? ()
#12 0x0817af77 in tcp_receive_loop ()
#13 0x08173597 in tcp_init_children ()
#14 0x080b20bf in main_loop ()
#15 0x080b38c3 in main ()
(gdb)
On Wed, Nov 23, 2011 at 10:35 AM, Daniel-Constantin Mierla <
miconda at gmail.com> wrote:
> Hello,
>
> 3.1.0 is not the right choice in 3.1 series, there were many fixes that
> were added to that release series branch. The latest stable version there
> is 3.1.5. Try with it (even better, try with latest version from git branch
> 3.1 -- see
> http://www.kamailio.org/dokuwiki/doku.php/install:kamailio-3.1.x-from-git)
>
> In this way we are sure it is not a bug that was fixed after the time of
> releasing 3.1.0 -- config file and database is the same as for 3.1.0.
>
> Cheers,
> Daniel
>
>
> On 11/23/11 4:01 PM, Jijo wrote:
>
> Thanks I will attach the logs soon..meanwhile here is the kamailio and
> openssl version
>
> OB151:~ # /usr/sbin/kamailio -V
> version: kamailio 3.1.0 (i386/linux) 21a375
> flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS, TLS_HOOKS, USE_RAW_SOCKS,
> USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC,
> USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER,
> USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
> ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16,
> MAX_URI_SIZE 1024, BUF_SIZE 65535, PKG_SIZE 15MB
> poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
> id: 21a375
> compiled on 09:22:51 Nov 4 2011 with gcc 4.5.0
>
>
> OB151:~ # openssl version -a
> OpenSSL 1.0.0 29 Mar 2010
> built on: 2011-05-31 07:52:17.000000000 +0000
> platform: linux-elf
> options: bn(64,32) rc4(4x,int) des(ptr,risc1,16,long) blowfish(idx)
> compiler: gcc -fPIC -DOPENSSL_PIC -DZLIB -DOPENSSL_THREADS -D_REENTRANT
> -DDSO_DLFCN -DHAVE_DLFCN_H
> -DL_ENDIAN -DTERMIO -O3 -fomit-frame-pointer -Wall -fomit-frame-pointer
> -fmessage-length=0 -O2 -Wall
> -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables
> -fasynchronous-unwind-tables -g -Wa,--noexecstack -fomit-frame-pointer
> -fno-strict-aliasing
> -DTERMIO -Wall -fstack-protector -DOPENSSL_BN_ASM_PART_WORDS
> -DOPENSSL_IA32_SSE2
> -DOPENSSL_BN_ASM_MONT -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM
> -DRMD160_ASM -DAES_ASM -DWHIRLPOOL_ASM
> OPENSSLDIR: "/etc/ssl"
>
>
> On Wed, Nov 23, 2011 at 4:44 AM, Daniel-Constantin Mierla <
> miconda at gmail.com> wrote:
>
>> Hello,
>>
>> (discussion kept only on sr-dev as it is very likely going to require
>> mostly devel interaction).
>>
>> What is the version of kamailio (-V command line option). Also, send the
>> verision of openssl library -- there were many bugs in various lib versions
>> that had to be workarounded in the module, maybe this is a new one that has
>> to be fixed.
>>
>> Do you get any error message in the syslog at the moment of the crash?
>>
>> What would be useful is to get the memory operations log, you can get it
>> by setting:
>>
>> memdbg=1
>> memlog=1
>>
>> in config file.
>>
>> Then repeat the test and make the log available for download somehow (if
>> it is too big), from start to the moment of the crash.
>>
>> Cheers,
>> Daniel
>>
>>
>> On 11/22/11 11:30 PM, Jijo wrote:
>>
>> 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
>>
>>
>>
>>
>> _______________________________________________
>> sr-dev mailing listsr-dev at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
>>
>>
>> --
>> Daniel-Constantin Mierla -- http://www.asipto.com
>> Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kathttp://linkedin.com/in/miconda -- http://twitter.com/miconda
>>
>>
>
> --
> Daniel-Constantin Mierla -- http://www.asipto.com
> Kamailio Advanced Training, Dec 5-8, Berlin: http://asipto.com/u/kathttp://linkedin.com/in/miconda -- http://twitter.com/miconda
>
>
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