(Caldera Issues Fix) Caldera UnixWare Dtlogin Utility Error File Permission Flaw Lets Local Users Overwrite Critical Files on the Server and May Allow a Local Users to Obtain Elevated Privileges
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SecurityTracker Alert ID: 1004248 |
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SecurityTracker URL: http://securitytracker.com/id/1004248
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: May 8 2002
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Impact:
Modification of system information, Modification of user information, User access via local system
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
A vulnerability was reported in Caldera's (SCO) UnixWare dtlogin utility. A local user may be able to cause files on the host to be overwritten.
It was originally reported that Dtlogin apparently writes error log entries to the file /var/dt/Xerrors. The default configuration permissions on /var/dt are '777' (global read, write, and execute). As a result, a remote user can create a symbolic link (symlink) from /var/dt/Xerrors to a critical file and then use dtlogin in a manner that will create an error condition to cause the dtlogin process to write error log entries to the linked file.
Caldera reports that this was caused by the dt/config/Xsession.d/0030.dttmpdir script, which was creating the following dt directories with 0777 perms:
/var/dt/
/var/dt/appconfig
/var/dt/appconfig/appmanager
/var/dt/tmp
In addition, Caldera states that libDtLogin.so was checking the permissions of /var/dt and, if found to be other than 0777, was changing them back to 0777.
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Impact:
A local user may be able to cause critical files to be overwritten, possibly with user-specified data. It may be possible for the local user to obtain elevated privileges, but that has not been confirmed.
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Solution:
The vendor has released a fix.
For Open UNIX 8.0.0:
Location of Fixed Binaries:
ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.18
The verification checksum is:
MD5 (erg711939.pkg.Z) = 513c98dedb5d2cff437e0e330e96d94e
Upgrade the affected binaries with the following commands:
Download erg711939.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg711939.pkg.Z
# pkgadd -d /var/spool/pkg/erg711939.pkg
For UnixWare 7.1.1:
Location of Fixed Binaries:
ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.18
The verification checksum is:
MD5 (erg711939.pkg.Z) = 513c98dedb5d2cff437e0e330e96d94e
Upgrade the affected binaries with the following commands:
Download erg711939.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg711939.pkg.Z
# pkgadd -d /var/spool/pkg/erg711939.pkg
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Vendor URL: www.caldera.com/ (Links to External Site)
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Cause:
Access control error, State error
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Underlying OS:
UNIX (Open UNIX-SCO)
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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: Wed, 8 May 2002 13:01:25 -0700
Subject: Security Update: [CSSA-2002-SCO.18] Open UNIX 8.0.0 UnixWare 7.1.1 : CDE /var/dt and subdirectories are writable by world
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To: bugtraq@securityfocus.com announce@lists.caldera.com scoannmod@xenitec.on.ca
______________________________________________________________________________
Caldera International, Inc. Security Advisory
Subject: Open UNIX 8.0.0 UnixWare 7.1.1 : CDE /var/dt and subdirectories are writable by world
Advisory number: CSSA-2002-SCO.18
Issue date: 2002 May 08
Cross reference:
______________________________________________________________________________
1. Problem Description
The dt/config/Xsession.d/0030.dttmpdir script was creating
the following dt directories with 0777 perms:
/var/dt/
/var/dt/appconfig
/var/dt/appconfig/appmanager
/var/dt/tmp
In addition, libDtLogin.so was checking the permissions of
/var/dt. If found to be other than 0777, it was changing them
back to 0777.
This update fixes the above problems, and also changes the
permissions of the offending directories on the system to
close the vulnerability.
2. Vulnerable Supported Versions
System Binaries
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Open UNIX 8.0.0 /usr/dt/config/Xsession.d/0030.dttmpdir
/usr/dt/lib/libDtLogin.so.1
UnixWare 7.1.1 /usr/dt/config/Xsession.d/0030.dttmpdir
/usr/dt/lib/libDtLogin.so.1
3. Solution
The proper solution is to install the latest packages.
4. Open UNIX 8.0.0
4.1 Location of Fixed Binaries
ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.18
4.2 Verification
MD5 (erg711939.pkg.Z) = 513c98dedb5d2cff437e0e330e96d94e
md5 is available for download from
ftp://stage.caldera.com/pub/security/tools/
4.3 Installing Fixed Binaries
Upgrade the affected binaries with the following commands:
Download erg711939.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg711939.pkg.Z
# pkgadd -d /var/spool/pkg/erg711939.pkg
5. UnixWare 7.1.1
5.1 Location of Fixed Binaries
ftp://stage.caldera.com/pub/security/openunix/CSSA-2002-SCO.18
5.2 Verification
MD5 (erg711939.pkg.Z) = 513c98dedb5d2cff437e0e330e96d94e
md5 is available for download from
ftp://stage.caldera.com/pub/security/tools/
5.3 Installing Fixed Binaries
Upgrade the affected binaries with the following commands:
Download erg711939.pkg.Z to the /var/spool/pkg directory
# uncompress /var/spool/pkg/erg711939.pkg.Z
# pkgadd -d /var/spool/pkg/erg711939.pkg
6. References
Specific references for this advisory:
none
Caldera UNIX security resources:
http://stage.caldera.com/support/security/
Caldera OpenLinux security resources:
http://www.caldera.com/support/security/index.html
This security fix closes Caldera incidents sr858543, fz519804
and erg711939.
7. Disclaimer
Caldera International, Inc. is not responsible for the
misuse of any of the information we provide on this website
and/or through our security advisories. Our advisories are
a service to our customers intended to promote secure
installation and use of Caldera products.
8. Acknowledgements
Caldera wishes to thank jGgM (jggm@mail.com) for discovering
and researching this vulnerability.
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