About
There is a vulnerability in the below program that allows arbitrary programs
to be executed, can you find it?
To do this level, log in as the level02 account with the password
level02. Files for this level can be found in /home/flag02.
Source code
(level2.c) download
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| #include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <stdio.h>
int main(int argc, char **argv, char **envp)
{
char *buffer;
gid_t gid;
uid_t uid;
gid = getegid();
uid = geteuid();
setresgid(gid, gid, gid);
setresuid(uid, uid, uid);
buffer = NULL;
asprintf(&buffer, "/bin/echo %s is cool", getenv("USER"));
printf("about to call system(\"%s\")\n", buffer);
system(buffer);
}
|