RedHat: 'esound' vulnerability
Posted by LinuxSecurity.com Team   
RedHat Linux Esound, the Gnome sound server, contains a race condition that a malicioususer could exploit to change permissions of any file owned by the esounduser.

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                   Red Hat, Inc. Security Advisory

Synopsis:          esound contains a race condition
Advisory ID:       RHSA-2000:077-03
Issue date:        2000-10-06
Updated on:        2000-10-06
Product:           Red Hat Linux
Keywords:          esound security esd socket Gnome
Cross references:  N/A
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1. Topic:

Esound, the Gnome sound server, contains a race condition that a malicious
user could exploit to change permissions of any file owned by the esound
user.

2. Relevant releases/architectures:

Red Hat Linux 6.0 - i386, alpha, sparc
Red Hat Linux 6.1 - i386, alpha, sparc
Red Hat Linux 6.2 - i386, alpha, sparc
Red Hat Linux 6.2EE - i386, alpha, sparc
Red Hat Linux 7.0 - i386
Red Hat Linux 7.0J - i386

3. Problem description:

Esound, the sound daemon used for Gnome, creates a world-writable
directory, /tmp/.esd.  This directory is owned by the user running esound,
and is used to store a socket which is used by programs connecting to the
sound server.  During startup, this socket's permissions are adjusted. An
attacker on the system can theoretically create a symbolic link, and cause
any file or directory owned by the user running esound to be made
world writable.

The new packages fixes this race condition.

4. Solution:

For each RPM for your particular architecture, run:

rpm -Fvh [filename]

where filename is the name of the RPM.

All active Gnome sessions should also be restarted after the upgrade is
applied.

5. Bug IDs fixed  (http://bugzilla.Red Hat.com/bugzilla for more info):

N/A

6. RPMs required:

Red Hat Linux 6.x:

alpha: 
ftp://updates.Red Hat.com/6.2/alpha/esound-0.2.20-0.alpha.rpm 
ftp://updates.Red Hat.com/6.2/alpha/esound-devel-0.2.20-0.alpha.rpm

sparc: 
ftp://updates.Red Hat.com/6.2/sparc/esound-0.2.20-0.sparc.rpm 
ftp://updates.Red Hat.com/6.2/sparc/esound-devel-0.2.20-0.sparc.rpm

i386: 
ftp://updates.Red Hat.com/6.2/i386/esound-0.2.20-0.i386.rpm 
ftp://updates.Red Hat.com/6.2/i386/esound-devel-0.2.20-0.i386.rpm

sources: 
ftp://updates.Red Hat.com/6.2/SRPMS/esound-0.2.20-0.src.rpm

Red Hat Linux 7.0:

i386: 
ftp://updates.Red Hat.com/7.0/i386/esound-0.2.20-1.i386.rpm 
ftp://updates.Red Hat.com/7.0/i386/esound-devel-0.2.20-1.i386.rpm

sources: 
ftp://updates.Red Hat.com/7.0/SRPMS/esound-0.2.20-1.src.rpm

7. Verification:

MD5 sum                           Package Name
--------------------------------------------------------------------------
4f7a81fe6b7f5a419272659b92d1dfc1  6.2/SRPMS/esound-0.2.20-0.src.rpm
648746086daa7bbc6bef00697e62bf51  6.2/alpha/esound-0.2.20-0.alpha.rpm
8a7dbf7dabbd7d9ca2861c1ecf2b2d5f  6.2/alpha/esound-devel-0.2.20-0.alpha.rpm
962fa1129804f2d8470e1767a352f77f  6.2/i386/esound-0.2.20-0.i386.rpm
784ec77026228d31d823e619c1de78d8  6.2/i386/esound-devel-0.2.20-0.i386.rpm
2127fdd7654b80506952dce08c3f5014  6.2/sparc/esound-0.2.20-0.sparc.rpm
0c191eee05a89dc0d12b3ca4981d2353  6.2/sparc/esound-devel-0.2.20-0.sparc.rpm
24f8e1b106500565e8426ad96150a001  7.0/SRPMS/esound-0.2.20-1.src.rpm
a61209acb87ed7f4fa5b1d63d161c85d  7.0/i386/esound-0.2.20-1.i386.rpm
6b326c66d570ee59eda7c2daf0ab4721  7.0/i386/esound-devel-0.2.20-1.i386.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
     http://www.Red Hat.com/corp/contact.html

You can verify each package with the following command:
    rpm --checksig  

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg 

8. References:

BugTraq ID: 1659  (http://www.securityfocus.com/bid/1659)


Copyright(c) 2000 Red Hat, Inc.