Bug 216937

Summary: CVE-2006-6097 GNU tar directory traversal
Product: Red Hat Enterprise Linux 4 Reporter: Lubomir Kundrak <lkundrak>
Component: tarAssignee: Peter Vrabec <pvrabec>
Status: CLOSED ERRATA QA Contact: Ben Levenson <benl>
Severity: high Docs Contact:
Priority: medium    
Version: 4.4Keywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
URL: http://lists.grok.org.uk/pipermail/full-disclosure/2006-November/050812.html
Whiteboard: impact=moderate,source=fulldisclosure,reported=20061122,public=20061121
Fixed In Version: RHSA-2006-0749 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2006-12-19 22:47:46 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:
Bug Depends On:    
Bug Blocks: 216938, 218426    

Description Lubomir Kundrak 2006-11-22 19:45:29 UTC 
Description of problem:

GNU tar contains a flaw, that makes tar overwrite an arbitrairy file when
extracting a crafted archive.

See the original advisory for details.

Steps to Reproduce:

#TAR=/usr/src/redhat/BUILD/tar-1.13.25/src/tar
TAR=tar

# crafting a symlink

gcc -o tarxyz tarxyz.c
./tarxyz > xyz.tar

# cleaning environment up

rm -f/home/$USER/hello.txt
rm -f xyz

# adding files, relative to xyz/

mkdir -p xyz/home/$USER
echo "Hello" > xyz/home/$USER/hello.txt
tar -rf xyz.tar xyz/home/$USER

# exploitation

rm -rf xyz      # so symlink to / can be created
$TAR -xf xyz.tar
cat /home/$USER/hello.txt

Additional info:

All supported RHEL (2.1--4) and FC (5,6) releases are vulnerable
Comment 1 Lubomir Kundrak 2006-11-27 08:37:35 UTC 
Kees Cook (of Ubuntu) reported an issue to upstream and proposed a patch.
See this thread:
http://lists.gnu.org/archive/html/bug-tar/2006-11/msg00028.html
Comment 3 Josh Bressers 2006-12-01 17:53:40 UTC 
Ping on this issue.

Can we get some updated packages.  The patch looks to be rather simple.
Comment 5 Peter Vrabec 2006-12-05 10:10:14 UTC 
fixed in:
tar-1.14-12.RHEL4,
tar-1.13.25-15.RHEL3,
tar-1.13.25-6.AS21.1

I dunno how to filed RHSA-2006:0749, concretely built for AS21.1.
Comment 9 Red Hat Bugzilla 2006-12-19 22:47:47 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2006-0749.html