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CVE-2021-3156-Baron-Samedit — جهد بحثي 1day | Kitploit
أدوات/GitHubGitHub/kernelzeroday/cve-2021-3156-baron-samedit
تحليل الثغرات الأمنيةالاستغلالمصممي الأخطاءالاختبار العشوائيالتعلم والتعليماستغلال الملفات الثنائية
GitHubkernelzeroday/cve-2021-3156-baron-samedit

CVE-2021-3156-Baron-Samedit

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185منذ 5 سنواتلم تتم المراجعة بعد

CVE-2021-3156-Baron-Samedit

يحتوي هذا المستودع على عملي في تنفيذٍ غير متقن لاستغلال علني من نوع 1day لثغرة sudo. تمنوا لي التوفيق.

إذا كنت ترغب في المساعدة، فلا تتردد.

قم بتجميع src/sudo المرفق تم تعديل sudoedit ليستخدم harness الخاص بـ AFL للحصول على المدخلات من STDIN

حالات اختبار الانهيار التي اكتشفتها حلقة التشويش في AFL حتى الآن، ألقِ نظرة عليها:

root@kitploit:~
-rw------- 1 root root   309 Jan 28 03:31 id:000000,sig:11,src:000024,time:335,op:havoc,rep:2
-rw------- 1 root root   309 Jan 28 03:31 id:000001,sig:06,src:000024,time:1419,op:havoc,rep:4
-rw------- 1 root root   278 Jan 28 03:31 id:000002,sig:06,src:000024,time:2545,op:havoc,rep:8
-rw------- 1 root root   300 Jan 28 03:31 id:000003,sig:11,src:000024,time:5812,op:havoc,rep:4
-rw------- 1 root root   309 Jan 28 03:31 id:000004,sig:11,src:000024,time:7063,op:havoc,rep:8
-rw------- 1 root root   296 Jan 28 03:31 id:000005,sig:11,src:000024,time:8231,op:havoc,rep:8
-rw------- 1 root root   309 Jan 28 03:31 id:000006,sig:11,src:000024,time:8395,op:havoc,rep:2
-rw------- 1 root root   310 Jan 28 03:31 id:000007,sig:11,src:000024,time:9048,op:havoc,rep:8
-rw------- 1 root root   277 Jan 28 03:31 id:000008,sig:11,src:000024,time:9305,op:havoc,rep:16
-rw------- 1 root root   281 Jan 28 03:31 id:000009,sig:06,src:000024,time:11059,op:havoc,rep:2
-rw------- 1 root root   232 Jan 28 03:31 id:000010,sig:11,src:000024,time:13883,op:havoc,rep:4
-rw------- 1 root root   304 Jan 28 03:31 id:000011,sig:11,src:000024,time:17245,op:havoc,rep:8
-rw------- 1 root root   265 Jan 28 03:31 id:000012,sig:06,src:000024,time:18928,op:havoc,rep:8
-rw------- 1 root root   309 Jan 28 03:31 id:000013,sig:11,src:000024,time:21131,op:havoc,rep:8
-rw------- 1 root root   309 Jan 28 03:31 id:000014,sig:09,src:000024,time:29628,op:havoc,rep:4
-rw------- 1 root root   306 Jan 28 03:32 id:000015,sig:11,src:000024,time:60593,op:havoc,rep:8
-rw------- 1 root root   284 Jan 28 03:32 id:000016,sig:06,src:000024,time:65998,op:havoc,rep:16
-rw------- 1 root root 91053 Jan 28 03:39 id:000017,sig:09,src:000026+000018,time:518485,op:splice,rep:8
-rw------- 1 root root   318 Jan 28 03:39 id:000018,sig:11,src:000026+000045,time:520493,op:splice,rep:2
-rw------- 1 root root 65399 Jan 28 03:42 id:000019,sig:06,src:000012,time:678458,op:havoc,rep:16
-rw------- 1 root root 65441 Jan 28 04:33 id:000020,sig:06,src:000009,time:3762442,op:havoc,rep:16
-rw------- 1 root root   303 Jan 28 04:44 id:000021,sig:11,src:000025+000034,time:4377085,op:splice,rep:4
-rw------- 1 root root 91045 Jan 28 04:46 id:000022,sig:06,src:000019+000058,time:4538775,op:splice,rep:16
-rw------- 1 root root   296 Jan 28 05:14 id:000023,sig:06,src:000051,time:6173954,op:havoc,rep:16
-rw------- 1 root root   279 Jan 28 06:10 id:000024,sig:11,src:000023+000037,time:9549571,op:splice,rep:4

sig:11 تعني Segmentation Fault، وهذا ما نريده. الإشارة 06 هي SIGABRT، وهي التي كانت لدينا منذ البداية.

قم بتحميل sudoedit المترجم (تأكد من أن الـ effective uid هو 0، وشغّل gdb بصلاحيات root) # gdb /usr/local/bin/sudoedit

حمّل حالة الانهيار من src/afl3/out/default/crashes: (ملاحظة: هذا أول خطأ sigsegv وجدته، وهو ليس جيداً جداً، هذا الملف id:000008 يمكن العثور عليه في crashes_old)

root@kitploit:~
gef➤  r < id:000008*

[ Legend: Modified register | Code | Heap | Stack | String ]
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── registers ────
$rax   : 0x414196c9adb30e58
$rbx   : 0x4141414141414140 ("@AAAAAAA"?)
$rcx   : 0x000055886c706010  →  0x0000000000000007
$rdx   : 0x4141414141414148 ("HAAAAAAA"?)
$rsp   : 0x00007fffdfe911d0  →  0x00007fb17cea12d0  →  "<- %s @ %s:%d := %s"
$rbp   : 0x00007fb17ccceb80  →  0x0000000000000000
$rsi   : 0x000055886c71cca0  →  0x4141414141414180
$rdi   : 0x00007fb17ccceb80  →  0x0000000000000000
$rip   : 0x00007fb17cb96a79  →  <_int_free+409> mov rax, QWORD PTR [r13+0x8]
$r8    : 0x7
$r9    : 0x1
$r10   : 0xfffffffffffff1ed
$r11   : 0x5
$r12   : 0x000055886c71cca0  →  0x4141414141414180
$r13   : 0x414196c9adb30de0
$r14   : 0x00007fb17cccf578  →  0x000055886c71ccb0  →  "AAAAAAAAAAAAAAAAAAAAAAAAARAAFAAAAAAAAAAAAAAAAAAAAA[...]"
$r15   : 0x00007fffdfe91290  →  0x00007fb17cc9bb5f  →  0x636d656d5f5f0043 ("C"?)
$eflags: [zero CARRY PARITY ADJUST SIGN trap INTERRUPT direction overflow RESUME virtualx86 identification]
$cs: 0x0033 $ss: 0x002b $ds: 0x0000 $es: 0x0000 $fs: 0x0000 $gs: 0x0000
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── stack ────
0x00007fffdfe911d0│+0x0000: 0x00007fb17cea12d0  →  "<- %s @ %s:%d := %s"	 ← $rsp
0x00007fffdfe911d8│+0x0008: 0x000055886c70e880  →  0x0000000000000043 ("C"?)
0x00007fffdfe911e0│+0x0010: 0x0000000000000000
0x00007fffdfe911e8│+0x0018: 0x000000017ce94e8e
0x00007fffdfe911f0│+0x0020: 0x0000000000000000
0x00007fffdfe911f8│+0x0028: 0x00007fb17cb416bb  →  <new_composite_name+203> test eax, eax
0x00007fffdfe91200│+0x0030: 0x00007fffdfe91290  →  0x00007fb17cc9bb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007fffdfe91208│+0x0038: 0xdfb8629d88483900
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── code:x86:64 ────
   0x7fb17cb96a69 <_int_free+393>  je     0x7fb17cb97018 <_int_free+1848>
   0x7fb17cb96a6f <_int_free+399>  test   BYTE PTR [rbp+0x4], 0x2
   0x7fb17cb96a73 <_int_free+403>  je     0x7fb17cb97028 <_int_free+1864>
 → 0x7fb17cb96a79 <_int_free+409>  mov    rax, QWORD PTR [r13+0x8]
   0x7fb17cb96a7d <_int_free+413>  test   al, 0x1
   0x7fb17cb96a7f <_int_free+415>  je     0x7fb17cb97050 <_int_free+1904>
   0x7fb17cb96a85 <_int_free+421>  mov    r14, rax
   0x7fb17cb96a88 <_int_free+424>  and    r14, 0xfffffffffffffff8
   0x7fb17cb96a8c <_int_free+428>  cmp    rax, 0x10
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "sudoedit", stopped 0x7fb17cb96a79 in _int_free (), reason: SIGSEGV
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x7fb17cb96a79 → _int_free(av=0x7fb17ccceb80 <main_arena>, p=0x55886c71cca0, have_lock=<optimized out>)
[#1] 0x7fb17cb41e5c → setname(name=0x7fb17cc9bb5f <_nl_C_name> "C", category=0xb)
[#2] 0x7fb17cb41e5c → __GI_setlocale(category=0xb, locale=<optimized out>)
[#3] 0x7fb17c70cc59 → sudoers_setlocale(locale_type=0x1, prev_locale=<optimized out>)
[#4] 0x7fb17c722336 → sudoers_policy_main(argc=<optimized out>, argv=<optimized out>, pwflag=0x0, env_add=<optimized out>, verbose=0x0, closure=0x7fffdfe93488)
[#5] 0x7fb17c71d65e → sudoers_policy_check(argc=0x7, argv=0x55886c709570, env_add=0x0, command_infop=0x7fffdfe93520, argv_out=0x7fffdfe93558, user_env_out=0x7fffdfe93540, errstr=0x7fffdfe93620)
[#6] 0x55886b1185db → policy_check(argc=0x7, argv=0x55886c709570, env_add=0x0, command_info=0x7fffdfe93520, argv_out=0x7fffdfe93558, user_env_out=0x7fffdfe93540)
[#7] 0x55886b1185db → main(argc=<optimized out>, argv=<optimized out>, envp=0x7fffdfe94758)
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
gef➤


gef➤  der $sp 50
0x00007ffcc9026680│+0x0000: 0x00007fca4b2b12d0  →  "<- %s @ %s:%d := %s"	 ← $rsp
0x00007ffcc9026688│+0x0008: 0x00005589bfc2e880  →  0x0000000000000043 ("C"?)
0x00007ffcc9026690│+0x0010: 0x0000000000000000
0x00007ffcc9026698│+0x0018: 0x000000014b2a4e8e
0x00007ffcc90266a0│+0x0020: 0x0000000000000000
0x00007ffcc90266a8│+0x0028: 0x00007fca4af516bb  →  <new_composite_name+203> test eax, eax
0x00007ffcc90266b0│+0x0030: 0x00007ffcc9026740  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90266b8│+0x0038: 0x79e92f350d458c00
0x00007ffcc90266c0│+0x0040: 0x79e92f350d458c00
0x00007ffcc90266c8│+0x0048: 0x00007ffcc90267b0  →  0x00007fca4b0db6a0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90266d0│+0x0050: 0x000000000000000b
0x00007ffcc90266d8│+0x0058: 0x00007fca4b0dd8e0  →  0x00007fca4af54170  →  <_nl_postload_ctype+0> mov rdx, QWORD PTR [rip+0x18b329]        # 0x7fca4b0df4a0 <_nl_global_locale>
0x00007ffcc90266e0│+0x0060: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90266e8│+0x0068: 0x00007fca4b0df578  →  0x00005589bfc3ccb0  →  "AAAAAAAAAAAAAAAAAAAAAAAAARAAFAAAAAAAAAAAAAAAAAAAAA[...]"
0x00007ffcc90266f0│+0x0070: 0x00007ffcc9026740  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90266f8│+0x0078: 0x00007fca4af51e5c  →  <setlocale+1644> mov rdx, QWORD PTR [rsp+0x8]
0x00007ffcc9026700│+0x0080: 0x00007fca4b2b124b  →  "-> %s @ %s:%d"
0x00007ffcc9026708│+0x0088: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026710│+0x0090: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026718│+0x0098: 0x00007fca4b2a4e8e  →  <sudo_debug_printf2_v1+190> mov rax, QWORD PTR fs:0x28
0x00007ffcc9026720│+0x00a0: 0x0000000000000000
0x00007ffcc9026728│+0x00a8: 0x00007fca4ab7b967  →  "sudoers_setlocale"
0x00007ffcc9026730│+0x00b0: 0x0000000000000000
0x00007ffcc9026738│+0x00b8: 0x0000000000000000
0x00007ffcc9026740│+0x00c0: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)	 ← $r15
0x00007ffcc9026748│+0x00c8: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026750│+0x00d0: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026758│+0x00d8: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026760│+0x00e0: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026768│+0x00e8: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026770│+0x00f0: 0x00007fca4b2b0830  →  0x6c61660065757274 ("true"?)
0x00007ffcc9026778│+0x00f8: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026780│+0x0100: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026788│+0x0108: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026790│+0x0110: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026798│+0x0118: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267a0│+0x0120: 0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267a8│+0x0128: 0x00000000000002fd
0x00007ffcc90267b0│+0x0130: 0x00007fca4b0db6a0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267b8│+0x0138: 0x00007fca4b0dbbe0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267c0│+0x0140: 0x00007fca4b0dbc60  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267c8│+0x0148: 0x00007fca4b0dc4e0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267d0│+0x0150: 0x00007fca4b0dba20  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267d8│+0x0158: 0x00007fca4b0db9a0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267e0│+0x0160: 0x00007ffcc9026720  →  0x0000000000000000
0x00007ffcc90267e8│+0x0168: 0x00007fca4b0dc1a0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267f0│+0x0170: 0x00007fca4b0dc200  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc90267f8│+0x0178: 0x00007fca4b0dc280  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026800│+0x0180: 0x00007fca4b0dc340  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
0x00007ffcc9026808│+0x0188: 0x00007fca4b0dc3c0  →  0x00007fca4b0abb5f  →  0x636d656d5f5f0043 ("C"?)
gef➤

قرصنة سعيدة!

انهيار جديد UWU، تحقق من هذا الوحش:

root@kitploit:~
gef➤  r < id:000008*

[ Legend: Modified register | Code | Heap | Stack | String ]
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── registers ────
$rax   : 0x414141414f414141 ("AAAOAAAA"?)
$rbx   : 0x000055e3c33cd080  →  0x000055e3c33cceb0  →  "JJJAAAAAAAAOAAAA AAAAAAAAAAAAAAJJJJJJJJJJJJJJJJJJU[...]"
$rcx   : 0x49f
$rdx   : 0x56
$rsp   : 0x00007fffb7527dc0  →  0x000055e3c33c7600  →  0x000055e3c33cd070  →  0x0000000000000000
$rbp   : 0x00007ffaa2cf4848  →  0x0000070400000703
$rsi   : 0x0
$rdi   : 0x00007ffaa34098d8  →  0x000004a00000049f
$rip   : 0x00007ffaa2c95fae  →  0x3774db8548188b48
$r8    : 0x00007ffaa340124b  →  "-> %s @ %s:%d"
$r9    : 0x00007fffb7527d30  →  0x0000003000000028 ("("?)
$r10   : 0x00007ffaa31fb45d  →  "__vdso_time"
$r11   : 0x00007fffb759ca30  →  0x48ffffb649058d48
$r12   : 0x000055e3c33bf938  →  0x000055e3c33c73a0  →  0x000055e3c33c7600  →  0x000055e3c33cd070  →  0x0000000000000000
$r13   : 0x000055e3c33cd070  →  0x0000000000000000
$r14   : 0x0
$r15   : 0x000055e3c33c1dd8  →  0x000055e3c33c1e08  →  0x72007800746f6f72 ("root"?)
$eflags: [zero carry parity adjust sign trap INTERRUPT direction overflow RESUME virtualx86 identification]
$cs: 0x0033 $ss: 0x002b $ds: 0x0000 $es: 0x0000 $fs: 0x0000 $gs: 0x0000
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── stack ────
0x00007fffb7527dc0│+0x0000: 0x000055e3c33c7600  →  0x000055e3c33cd070  →  0x0000000000000000	 ← $rsp
0x00007fffb7527dc8│+0x0008: 0x00007ffaa2cf0970  →  0x0000000000000000
0x00007fffb7527dd0│+0x0010: 0x0000000060137cb7
0x00007fffb7527dd8│+0x0018: 0x000055e3c33cd070  →  0x0000000000000000
0x00007fffb7527de0│+0x0020: 0x00007ffaa2cf482c  →  0x000006fd000006fc
0x00007fffb7527de8│+0x0028: 0x000055e3c33c1dd8  →  0x000055e3c33c1e08  →  0x72007800746f6f72 ("root"?)
0x00007fffb7527df0│+0x0030: 0x00007ffaa2cf4848  →  0x0000070400000703
0x00007fffb7527df8│+0x0038: 0x00007ffaa2c754fc  →  0x28246c894c01f883
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── code:x86:64 ────
   0x7ffaa2c95fa1 <userlist_matches+65> call   0x7ffaa2c5a2a0 <sudo_debug_enter_v1@plt>
   0x7ffaa2c95fa6 <userlist_matches+70> mov    rax, QWORD PTR [rbx+0x8]
   0x7ffaa2c95faa <userlist_matches+74> mov    rax, QWORD PTR [rax+0x8]
 → 0x7ffaa2c95fae <userlist_matches+78> mov    rbx, QWORD PTR [rax]
   0x7ffaa2c95fb1 <userlist_matches+81> test   rbx, rbx
   0x7ffaa2c95fb4 <userlist_matches+84> je     0x7ffaa2c95fed <userlist_matches+141>
   0x7ffaa2c95fb6 <userlist_matches+86> lea    r13, [rip+0x60bb7]        # 0x7ffaa2cf6b74
   0x7ffaa2c95fbd <userlist_matches+93> nop    DWORD PTR [rax]
   0x7ffaa2c95fc0 <userlist_matches+96> mov    rdi, r12
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── source:./match.c+119 ────
    114	 userlist_matches(struct sudoers_parse_tree *parse_tree, const struct passwd *pw,
    115	     const struct member_list *list)
    116	 {
    117	     struct member *m;
    118	     int matched = UNSPEC;
 →  119	     debug_decl(userlist_matches, SUDOERS_DEBUG_MATCH);
    120
    121	     TAILQ_FOREACH_REVERSE(m, list, member_list, entries) {
    122	 	if ((matched = user_matches(parse_tree, pw, m)) != UNSPEC)
    123	 	    break;
    124	     }
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── threads ────
[#0] Id 1, Name: "sudoedit", stopped 0x7ffaa2c95fae in userlist_matches (), reason: SIGSEGV
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── trace ────
[#0] 0x7ffaa2c95fae → userlist_matches(parse_tree=0x55e3c33bf938, pw=0x55e3c33c1dd8, list=0x55e3c33cd080)
[#1] 0x7ffaa2c754fc → sudoers_lookup_check(nss=0x7ffaa2cf0970 <sudo_nss_file>, pw=0x55e3c33c1dd8, validated=<optimized out>, info=0x7fffb7527e60, matching_cs=<optimized out>, defs=<optimized out>, now=0x60137cb7)
[#2] 0x7ffaa2c754fc → sudoers_lookup(snl=<optimized out>, pw=<optimized out>, cmnd_status=0x7ffaa2cf0bb8 <cmnd_status>, pwflag=<optimized out>)
[#3] 0x7ffaa2c82354 → sudoers_policy_main(argc=<optimized out>, argv=<optimized out>, pwflag=0x0, env_add=<optimized out>, verbose=0x0, closure=0x7fffb7529fe8)
[#4] 0x7ffaa2c7d65e → sudoers_policy_check(argc=0x7, argv=0x55e3c33bc570, env_add=0x0, command_infop=0x7fffb752a080, argv_out=0x7fffb752a0b8, user_env_out=0x7fffb752a0a0, errstr=0x7fffb752a180)
[#5] 0x55e3c0d245db → policy_check(argc=0x7, argv=0x55e3c33bc570, env_add=0x0, command_info=0x7fffb752a080, argv_out=0x7fffb752a0b8, user_env_out=0x7fffb752a0a0)
[#6] 0x55e3c0d245db → main(argc=<optimized out>, argv=<optimized out>, envp=0x7fffb752b2b8)
───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
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