mirror of
https://git.k-space.ee/arti/vt1200.git
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SDD
1e5c095b72
The firmware transforms the reply (16-round Feistel per 8-byte record) and compares it with the host-order copy of the challenge, so the answer is swap4(inverse_transform(swap4(challenge))). The font stages are memcpy in this path because dwt_prf initialises only mode 1. challenge.py implements the transform and its inverse using the firmware's fixed key/SP table; solve.py answers the challenge over TCP using the unmodified exploit client. 320 forward vectors, the firmware's own inverse and three live sessions validate it. A live run with no breakpoints poked the 82-byte hello-world payload and ran it: MAGIC DEAD/BEEF/0400, VRAM 1024/1024. Notes and evidence under dwt/notes and dwt/evidence.
44 lines
1.2 KiB
Plaintext
44 lines
1.2 KiB
Plaintext
MAME debugger version 0.289 (mame0289-dirty)
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Currently targeting vt1200 (VT1200 X terminal (v2.2 firmware))
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Breakpoint 1 set
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Breakpoint 2 set
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Breakpoint 3 set
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Breakpoint 4 set
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Breakpoint 5 set
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Breakpoint 6 set
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Breakpoint 7 set
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Breakpoint 8 set
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Breakpoint 9 set
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LIVE2 accept_debug_conn entry pc=3F58AD60
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LIVE2 dispatcher entry pc=3F59F320
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LIVE2 dwt_prf challenge entry pc=3F59FDC0
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LIVE2 challenge sent a13=007AE7B0 wire=3DB79CF3.8EB50000.C0A86302.3EB794F3 host=F39CB73D.0000B58E.0263A8C0.F394B73E
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LIVE2 pre-transform reply=71C08104.AF81012D.BE5884F7.634E8818
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LIVE2 memcmp-args expecting=F39CB73D.0000B58E.0263A8C0.F394B73E got=F39CB73D.0000B58E.0263A8C0.F394B73E
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LIVE2 challenge memcmp a8=00000000 (0=equal)
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LIVE2 accept_debug_conn entry pc=3F58AD60
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LIVE2 dispatcher entry pc=3F59F320
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LIVE2 dwt_prf challenge entry pc=3F59FDC0
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LIVE2 challenge sent a13=007AE7B0 wire=ECB9DDEA.25B70100.C0A86302.EDB9D5EA host=EADDB9EC.0001B725.0263A8C0.EAD5B9ED
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LIVE2 pre-transform reply=B5DE07BF.872DCB1A.323728E1.8B9B13E4
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LIVE2 memcmp-args expecting=EADDB9EC.0001B725.0263A8C0.EAD5B9ED got=EADDB9EC.0001B725.0263A8C0.EAD5B9ED
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LIVE2 challenge memcmp a8=00000000 (0=equal)
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LIVE2 rdebug_poke entry pc=3F5A1B50
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LIVE2 rdebug_jump entry pc=3F5A3890
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