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AUSCERT External Security Bulletin Redistribution
ESB-2000.277 -- RHSA-2000:077-03
esound contains a race condition
10 October 2000
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AusCERT Security Bulletin Summary
---------------------------------
Product: esound
Vendor: Red Hat
Operating System: Red Hat Linux
Impact: Modify Permissions
Access Required: Local
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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.redhat.com/bugzilla for more info):
N/A
6. RPMs required:
Red Hat Linux 6.x:
alpha:
ftp://updates.redhat.com/6.2/alpha/esound-0.2.20-0.alpha.rpm
ftp://updates.redhat.com/6.2/alpha/esound-devel-0.2.20-0.alpha.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/esound-0.2.20-0.sparc.rpm
ftp://updates.redhat.com/6.2/sparc/esound-devel-0.2.20-0.sparc.rpm
i386:
ftp://updates.redhat.com/6.2/i386/esound-0.2.20-0.i386.rpm
ftp://updates.redhat.com/6.2/i386/esound-devel-0.2.20-0.i386.rpm
sources:
ftp://updates.redhat.com/6.2/SRPMS/esound-0.2.20-0.src.rpm
Red Hat Linux 7.0:
i386:
ftp://updates.redhat.com/7.0/i386/esound-0.2.20-1.i386.rpm
ftp://updates.redhat.com/7.0/i386/esound-devel-0.2.20-1.i386.rpm
sources:
ftp://updates.redhat.com/7.0/SRPMS/esound-0.2.20-1.src.rpm
7. Verification:
MD5 sum Package Name
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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.redhat.com/corp/contact.html
You can verify each package with the following command:
rpm --checksig <filename>
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 <filename>
8. References:
BugTraq ID: 1659 (http://www.securityfocus.com/bid/1659)
Copyright(c) 2000 Red Hat, Inc.
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