Demo-ing CVE-2017-1000253 in a container. This demo relies on Qualys POC code that performs the exploit over CentOS.
1.Install CentOS 7
2.Install Docker
3.Edit the /etc/yum.repos.d/CentOS-Vault.repo file:
1.Change each entry to path to include 7.3.1611:
baseurl=http://vault.centos.org/7.3.1611/os/$basearch/
baseurl=http://vault.centos.org/7.3.1611/updates/$basearch/
...
2.Enable all the entries:
enabled=1
4.Update the repo list
yum repolist
5.Install a vulnerable kernel
yum install kernel-3.10.0-514.26.1.el7.x86_64
6.Check the kernel ID (in the following example, it is 0):
# awk -F\' '$1=="menuentry " {print i++ " : " $2}' /etc/grub2.cfg0
0 : CentOS Linux (3.10.0-514.26.1.el7.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-514.26.1.el7.x86_64) 7 (Core) with debugging
2 : CentOS Linux 7 (Core), with Linux 3.10.0-229.20.1.el7.x86_64
7.Set the default entry for grub:
grub2-set-default 0
8.Make sure it had changed:
# grub2-editenv list
saved_entry=0
9.Reboot
shutdown -r now
10.Make sure the vulnerable kernel was loaded
# uname -a
Linux devSDces71b305-vm0 3.10.0-514.26.1.el7.x86_64 #1 SMP Thu Jun 29 16:05:25 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
docker build -t pie-cve .docker run -it -u 4444 pie-cveNormally, after a few hours the exploit will be done. The "hacker.txt" file will be written the /root directory inside the container.
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