(Slackware Issues Fix) GNOME Display Manager (gdm) Lets Local Users View Files With Root Privileges
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SecurityTracker Alert ID: 1007560
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CVE Reference: CAN-2003-0547
(Links to External Site)
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Updated: Dec 1 2003
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Original Entry Date: Aug 25 2003
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Impact: Denial of service via network, Disclosure of system information, Disclosure of user information
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Fix Available: Yes
Vendor Confirmed: Yes
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Version(s): prior to 2.4.1.6
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Description: Several vulnerabilities were reported in the GNOME Display Manager (gdm). A local user can view arbitrary files on the system. A remote user may be able to cause the gdm daemon may crash.
It is reported that a local user can make a symbolic link (symlink) from an arbitrary file on the system to the '~/.xsession-errors'
file. Then, when gdm runs and is configured with the "examine session errors" option, the local user can view the symlinked file
(CVE: CAN-2003-0547). Any file can be read with root privileges, according to the report.
It is also reported that there are
two vulnerabilties in the X Display Manager Control Protocol (XDMCP) implementation. A remote user can cause the gdm daemon to
crash. If a host expires, the gdm daemon may crash (CVE: CAN-2003-0548). If an authorization key name is shorter then 18 bytes,
the gdm daemon may crash (CVE: CAN-2003-0549).
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Impact: A local user can view arbitrary files with root privileges.
A remote user may be able to cause the daemon to crash.
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Solution: Slackware has released a fix.
Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/gdm-2.4.1.6-i386-1.tgz
Updat
ed package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/gnome/gdm-2.4.1.6-i486-1.tgz
The
MD5 signatures are:
Slackware 9.0 package:
a5939f91ac56b5dd97d4a2013f099aed gdm-2.4.1.6-i386-1.tgz
Slackware -current
package:
26459fb6dec7279fe4d80aba0b3ac4ff gdm-2.4.1.6-i486-1.tgz
To install, upgrade using upgradepkg (as root):
upgradepkg
gdm-2.4.1.6-i386-1.tgz
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Vendor URL: www.5z.com/jirka/gdm.html (Links to External Site)
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Cause: Access control error, Exception handling error
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Underlying OS: Linux (Slackware)
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Underlying OS Comments: 9.0
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Reported By: Slackware Security Team <security@slackware.com>
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Sun, 24 Aug 2003 15:48:28 -0700 (PDT)
From: Slackware Security Team <security@slackware.com>
Subject: [slackware-security] GDM security update (SSA:2003-236-01)
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
[slackware-security] GDM security update (SSA:2003-236-01)
Upgraded gdm packages are available for Slackware 9.0 and -current.
These fix a security issue where a local user may use GDM to read any
file on the system.
Here are the details from the Slackware 9.0 ChangeLog:
+--------------------------+
Sun Aug 24 14:36:29 PDT 2003
patches/packages/gdm-2.4.1.6-i386-1.tgz: Upgraded to gdm-2.4.1.6.
This fixes a bug where a local user may read any system file by making a
symlink to it from $HOME/.xsession-errors and using GDM's error browser
to read the file.
(* Security fix *)
+--------------------------+
WHERE TO FIND THE NEW PACKAGES:
+-----------------------------+
Updated package for Slackware 9.0:
ftp://ftp.slackware.com/pub/slackware/slackware-9.0/patches/packages/gdm-2.4.1.6-i386-1.tgz
Updated package for Slackware -current:
ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/gnome/gdm-2.4.1.6-i486-1.tgz
MD5 SIGNATURES:
+-------------+
Slackware 9.0 package:
a5939f91ac56b5dd97d4a2013f099aed gdm-2.4.1.6-i386-1.tgz
Slackware -current package:
26459fb6dec7279fe4d80aba0b3ac4ff gdm-2.4.1.6-i486-1.tgz
INSTALLATION INSTRUCTIONS:
+------------------------+
Upgrade using upgradepkg (as root):
upgradepkg gdm-2.4.1.6-i386-1.tgz
+-----+
Slackware Linux Security Team
http://slackware.com/gpg-key
security@slackware.com
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