CAPCOMIN created an issue (kamailio/kamailio#4204)
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### Description
<!-- Explain what you did, what you expected to happen, and what actually happened. -->
I am experimenting with fuzzing on Kamailio SIP. The messages in the attached file crash the Kamailio server.
### Troubleshooting
#### Reproduction
<!-- If the issue can be reproduced, describe how it can be done. --> You can build the image using this [dockerfile](https://github.com/profuzzbench/profuzzbench/blob/master/subjects/SIP/Kamail...). I am running the server with a basic configuration (attached kamailio-basic.cfg), using the command: ``` ./src/kamailio -f ../kamailio-basic.cfg -L ./src/modules -Y runtime_dir -n 1 -D -E ``` [kamailio-basic.cfg.txt](https://github.com/user-attachments/files/19615271/kamailio-basic.cfg.txt) On the same machine, I am sending the malformed message using aflnet-replay: ``` aflnet-replay ~/sipcrash.txt SIP 5060 ```
[sipcrash.txt](https://github.com/user-attachments/files/19615274/sipcrash.txt)
#### Debugging Data
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gdb /path/to/kamailio /path/to/corefile bt full info locals list
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``` root@d3fd59910480:/home/ubuntu/experiments/kamailio# ./src/kamailio -f ../kamailio-basic.cfg -L ./src/modules -Y runtime_dir -n 1 -D -E #!!! 0(139581) INFO: <core> [core/sctp_core.c:75]: sctp_core_check_support(): SCTP API not enabled - if you want to use it, load sctp module Listening on udp: 127.0.0.1 [127.0.0.1]:5060 Aliases:
WARNING: no fork mode 0(139581) INFO: rr [./../outbound/api.h:52]: ob_load_api(): unable to import bind_ob - maybe module is not loaded 0(139581) INFO: rr [rr_mod.c:188]: mod_init(): outbound module not available 0(139581) INFO: <core> [main.c:2841]: main(): processes (at least): 4 - shm size: 67108864 - pkg size: 8388608 0(139581) INFO: <core> [core/udp_server.c:154]: probe_max_receive_buffer(): SO_RCVBUF is initially 212992 0(139581) INFO: <core> [core/udp_server.c:206]: probe_max_receive_buffer(): SO_RCVBUF is finally 425984 0(139581) WARNING: {1 1 REGISTER 1-670@127.0.0.1} sanity [sanity.c:612]: check_cl(): content length header missing in request ================================================================= ==139581==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000001d5e560 at pc 0x000000fcbc2f bp 0x7ffd115433d0 sp 0x7ffd115433c8 READ of size 1 at 0x000001d5e560 thread T0
#0 0xfcbc2e in skip_uri /home/ubuntu/experiments/kamailio/src/core/parser/contact/contact.c:53:10 #1 0xfcbc2e in parse_contacts /home/ubuntu/experiments/kamailio/src/core/parser/contact/contact.c:210:7 #2 0xfcdd18 in contact_parser /home/ubuntu/experiments/kamailio/src/core/parser/contact/parse_contact.c:55:7 #3 0xfcdd18 in parse_contact /home/ubuntu/experiments/kamailio/src/core/parser/contact/parse_contact.c:84:6 #4 0x7f0fe32590c4 in parse_message /home/ubuntu/experiments/kamailio/src/modules/registrar/sip_msg.c:125:26 #5 0x7f0fe3266f2f in save /home/ubuntu/experiments/kamailio/src/modules/registrar/save.c:897:6 #6 0x695413 in do_action /home/ubuntu/experiments/kamailio/src/core/action.c:1082:4 #7 0x6ce894 in run_actions /home/ubuntu/experiments/kamailio/src/core/action.c:1581:7 #8 0x6d161c in run_actions_safe /home/ubuntu/experiments/kamailio/src/core/action.c:1645:8 #9 0x5f8b1a in rval_get_int /home/ubuntu/experiments/kamailio/src/core/rvalue.c:915:9 #10 0x603507 in rval_expr_eval_int /home/ubuntu/experiments/kamailio/src/core/rvalue.c:1913:8 #11 0x60259f in rval_expr_eval_int /home/ubuntu/experiments/kamailio/src/core/rvalue.c:1921:8 #12 0x691381 in do_action /home/ubuntu/experiments/kamailio/src/core/action.c:1052:10 #13 0x6ce894 in run_actions /home/ubuntu/experiments/kamailio/src/core/action.c:1581:7 #14 0x6924cb in do_action /home/ubuntu/experiments/kamailio/src/core/action.c:700:8 #15 0x6ce894 in run_actions /home/ubuntu/experiments/kamailio/src/core/action.c:1581:7 #16 0x6d19fd in run_top_route /home/ubuntu/experiments/kamailio/src/core/action.c:1666:8 #17 0xb16ce6 in receive_msg /home/ubuntu/experiments/kamailio/src/core/receive.c:423:8 #18 0x7886fb in udp_rcv_loop /home/ubuntu/experiments/kamailio/src/core/udp_server.c:543:4 #19 0x4f9ab0 in main_loop /home/ubuntu/experiments/kamailio/src/main.c:1480:10 #20 0x51b219 in main /home/ubuntu/experiments/kamailio/src/main.c:2863:6 #21 0x7f0fe79b2082 in __libc_start_main /build/glibc-e2p3jK/glibc-2.31/csu/../csu/libc-start.c:308:16 #22 0x43479d in _start (/home/ubuntu/experiments/kamailio/src/kamailio+0x43479d)
0x000001d5e560 is located 0 bytes to the right of global variable 'buf' defined in 'core/udp_server.c:425:14' (0x1d4e560) of size 65536 SUMMARY: AddressSanitizer: global-buffer-overflow /home/ubuntu/experiments/kamailio/src/core/parser/contact/contact.c:53:10 in skip_uri Shadow bytes around the buggy address: 0x0000803a3c50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0000803a3c60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0000803a3c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0000803a3c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0000803a3c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0000803a3ca0: 00 00 00 00 00 00 00 00 00 00 00 00[f9]f9 f9 f9 0x0000803a3cb0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 0x0000803a3cc0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 0x0000803a3cd0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 0x0000803a3ce0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 0x0000803a3cf0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb Shadow gap: cc ==139581==ABORTING ```
#### Log Messages
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In the Debugging Data
#### SIP Traffic
<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->
[traffic.txt](https://github.com/user-attachments/files/19615184/traffic.txt)
### Possible Solutions
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
``` version: kamailio 5.5.0-dev2 (x86_64/linux) 2648eb-dirty flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, 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_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: 2648eb -dirty compiled on 11:51:00 May 5 2024 with afl-clang-fast clang version 10.0.0-4ubuntu1 ```
* **Operating System**:
<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `lsb_release -a` and `uname -a`) -->
``` Linux d3fd59910480 5.15.0-125-generic #135~20.04.1-Ubuntu SMP Mon Oct 7 13:56:22 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux ```