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CVE-2018-18955

Description

In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction.

POC

Reference

- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd

- https://www.exploit-db.com/exploits/45886/

- https://www.exploit-db.com/exploits/45915/

Github

- https://github.com/0xTo/linux-kernel-exploits

- https://github.com/ARPSyndicate/cvemon

- https://github.com/Al1ex/LinuxEelvation

- https://github.com/De4dCr0w/Linux-kernel-EoP-exp

- https://github.com/Disturbante/Linux-Pentest

- https://github.com/Esther7171/THM-Walkthroughs

- https://github.com/Esther7171/TryHackMe-Walkthroughs

- https://github.com/HaleyWei/POC-available

- https://github.com/HaxorSecInfec/autoroot.sh

- https://github.com/JlSakuya/Linux-Privilege-Escalation-Exploits

- https://github.com/KarimLedesmaHaron/THM-Tutoriales

- https://github.com/LouisLiuNova/container-escape-exploits

- https://github.com/LywwKkA-aD/htb-scripts

- https://github.com/Metarget/metarget

- https://github.com/Micr067/linux-kernel-exploits

- https://github.com/PsychoH4x0r/Unknown1337-Auto-Root-

- https://github.com/QChiLan/linux-exp

- https://github.com/SecWiki/linux-kernel-exploits

- https://github.com/ShehanSanjula/Linux-Kernel-Exploits

- https://github.com/a-roshbaik/Linux-Privilege-Escalation-Exploits

- https://github.com/albinjoshy03/linux-kernel-exploits

- https://github.com/alian87/linux-kernel-exploits

- https://github.com/anoaghost/Localroot_Compile

- https://github.com/bcoles/kernel-exploits

- https://github.com/distance-vector/linux-kernel-exploits

- https://github.com/fei9747/LinuxEelvation

- https://github.com/florentvinai/CompteRendu-CTF-Mordor

- https://github.com/iridium-soda/container-escape-exploits

- https://github.com/kumardineshwar/linux-kernel-exploits

- https://github.com/n3t1nv4d3/kernel-exploits

- https://github.com/rakjong/LinuxElevation

- https://github.com/scheatkode/CVE-2018-18955

- https://github.com/siddicky/yotjf

- https://github.com/substing/internal_ctf

- https://github.com/vlain1337/auto-lpe

- https://github.com/w3workerz/THM-Walkthroughs

- https://github.com/xFinu/linux-kernel-exploits

- https://github.com/xfinest/linux-kernel-exploits

- https://github.com/yige666/linux-kernel-exploits

- https://github.com/zhenya-roadtojapan/TryHackMe-write-ups