DirtyCred is a kernel exploitation concept that swaps unprivileged kernel credentials with privileged ones to escalate privilege. Instead of overwriting any critical data fields on kernel heap, DirtyCred abuses the heap memory reuse mechanism to get privileged. Although the concept is simple, it is effective.
Data-only: no need to bypass KASLR or leak kernel heap
Universal: the exploits written with DirtyCred would work across different kernels and architectures.
Effective: bypass all the available exploit mitigation in upstream kernel.
some others to be coming...
See the code here.
We provide two VMs for testing CVE-2021-4154. Each connection to the VM has 10 minitues timeout (i.e. the VM will be shutdown after being connected for 10 minitues). Each connection will get a fresh VM, everything stored before will be reset. When accessing the VM, please login the system with low user whose password is low. Please compile the exploit code (named exp.c) then launch the attack.
Please login with user low and password low
Ubuntu 20
nc 150.136.171.117 1337
or
socat FILE:`tty`,raw,echo=0 TCP:150.136.171.117:1337
Centos 8
nc 150.136.171.117 1338
or
socat FILE:`tty`,raw,echo=0 TCP:150.136.171.117:1338
This research was done with the help of Yuhang Wu and Xinyu Xing. Thanks Eduardo Vela for providing this amazing logo.