Debian debmake Unsafe Temporary Directories May Let Local Users Gain Elevated Privileges
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SecurityTracker Alert ID: 1012678 |
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SecurityTracker URL: http://securitytracker.com/id/1012678
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CVE Reference:
CAN-2004-1179
(Links to External Site)
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Date: Dec 24 2004
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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 debmake for Debian Linux. A local user may be able to gain elevated privileges.
Debian reported that the debstd script in debmake creates temporary directories in an insecure manner. A local user can create a symbolic link (symlink) from a critical file on the system to a temporary directory name to be used by debstd. Then, when debstd is executed by the target user, the symlinked file will be overwritten with the privileges of the target user.
Javier Fernandez-Sanguino Pena is credited with reporting this flaw.
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Impact:
A local user may be able to gain elevated privileges.
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Solution:
The vendor has issued a fixed version for Debian GNU/Linux 3.0 alias woody:
Source archives:
http://security.debian.org/pool/updates/main/d/debmake/debmake_3.6.10.woody.1.dsc
Size/MD5 checksum: 497 fcbfe41a644d608b165a1e21ac578115
http://security.debian.org/pool/updates/main/d/debmake/debmake_3.6.10.woody.1.tar.gz
Size/MD5 checksum: 39960 9c32e99bb95f3d62d91fa613e282951a
Architecture independent components:
http://security.debian.org/pool/updates/main/d/debmake/debmake_3.6.10.woody.1_all.deb
Size/MD5 checksum: 44572 b15c79fd0c73a2d665628092eee19027
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Vendor URL: www.debian.org/security/ (Links to External Site)
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Cause:
Access control error, State error
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Underlying OS:
Linux (Debian)
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Message History:
None.
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Source Message Contents
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Date: Wed, 22 Dec 2004 15:46:38 +0100 (CET)
Subject: [SECURITY] [DSA 615-1] New debmake package fixes insecure temporary directories
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
Debian Security Advisory DSA 615-1 security@debian.org
http://www.debian.org/security/ Martin Schulze
December 22nd, 2004 http://www.debian.org/security/faq
- --------------------------------------------------------------------------
Package : debmake
Vulnerability : insecure temporary files
Problem-Type : local
Debian-specific: yes
CVE ID : CAN-2004-1179
Debian Bug : 286382
Javier Fernández-Sanguino Peña noticed that the debstd script from
debmake, a deprecated helper package for Debian packaging, created
temporary directories in an insecure manner. This can be exploited by
a malicious user to overwrite arbitrary files owned by the victim.
For the stable distribution (woody) this problem has been fixed in
version 3.6.10.woody.1.
For the unstable distribution (sid) this problem has been fixed in
version 3.7.7.
We recommend that you upgrade your debmake package.
Upgrade Instructions
- --------------------
wget url
will fetch the file for you
dpkg -i file.deb
will install the referenced file.
If you are using the apt-get package manager, use the line for
sources.list as given below:
apt-get update
will update the internal database
apt-get upgrade
will install corrected packages
You may use an automated update by adding the resources from the
footer to the proper configuration.
Debian GNU/Linux 3.0 alias woody
- --------------------------------
Source archives:
http://security.debian.org/pool/updates/main/d/debmake/debmake_3.6.10.woody.1.dsc
Size/MD5 checksum: 497 fcbfe41a644d608b165a1e21ac578115
http://security.debian.org/pool/updates/main/d/debmake/debmake_3.6.10.woody.1.tar.gz
Size/MD5 checksum: 39960 9c32e99bb95f3d62d91fa613e282951a
Architecture independent components:
http://security.debian.org/pool/updates/main/d/debmake/debmake_3.6.10.woody.1_all.deb
Size/MD5 checksum: 44572 b15c79fd0c73a2d665628092eee19027
These files will probably be moved into the stable distribution on
its next update.
- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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