(Debian Issues Fix) cpio -O Unsafe umask May Let Local Users Read or Overwrite Archives
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SecurityTracker Alert ID: 1013071 |
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SecurityTracker URL: http://securitytracker.com/id/1013071
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CVE Reference:
CAN-1999-1572
(Links to External Site)
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Date: Feb 3 2005
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Impact:
Disclosure of user information, Modification of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Description:
A vulnerability was reported in cpio as distributed with FreeBSD and possibly affecting other operating systems. A local user may be able to read archived files.
In 1996, Georg-W. Koltermann reported that cpio uses a umask of '0' when creating files using the '-O' archive option. As a result, the files are created with mode 0666, allowing a local user to read or overwrite the files.
The flaw resides in 'cpio/main.c'.
The original FreeBSD problem report is available at:
http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/1391
[Editor's note: This issue from 1996/1997 is being added to our database because a CVE entry for this issue was generated on January 29, 2005.]
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Impact:
A local user can read or overwrite archives.
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Solution:
Debian has released a fix.
Debian GNU/Linux 3.0 alias woody:
Source archives:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1.dsc
Size/MD5 checksum: 549 45ee6d04cffc59c6e0d125ab269d8672
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1.diff.gz
Size/MD5 checksum: 22965 a5db2ad1ec00b2825bbdf4f0acaf8a84
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2.orig.tar.gz
Size/MD5 checksum: 181728 3e976db71229d52a8a135540698052df
Alpha architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_alpha.deb
Size/MD5 checksum: 73064 029c7d1de8bff5d6f63c7702455c0e17
ARM architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_arm.deb
Size/MD5 checksum: 63746 05f2cee18a28822b4fbe0d54f2b0efcf
Intel IA-32 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_i386.deb
Size/MD5 checksum: 61382 2011b7b05347a22780fe5a2d2da77923
Intel IA-64 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_ia64.deb
Size/MD5 checksum: 84938 173755073bd59fee905debce08456824
HP Precision architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_hppa.deb
Size/MD5 checksum: 69512 e950b2aa1f51a0f9412c319888882496
Motorola 680x0 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_m68k.deb
Size/MD5 checksum: 59714 c6c591c1839c464fb0cb2294d1758875
Big endian MIPS architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_mips.deb
Size/MD5 checksum: 69094 8aee70b66943403293252649d4879134
Little endian MIPS architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_mipsel.deb
Size/MD5 checksum: 68806 9e761f1fe3d156c5c557d3a28d51ab37
PowerPC architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_powerpc.deb
Size/MD5 checksum: 64084 f0fa8bf78610ed20b6135b4c7c04436c
IBM S/390 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_s390.deb
Size/MD5 checksum: 63866 ba0b403eaee5bcd05d8d0cbf3c48cfcb
Sun Sparc architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_sparc.deb
Size/MD5 checksum: 65818 f5e0c10d8e46321e8c584454402512c5
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Vendor URL: www.gnu.org/software/cpio/ (Links to External Site)
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Cause:
Access control error
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Underlying OS:
Linux (Debian)
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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, 2 Feb 2005 17:57:21 +0100 (CET)
Subject: [SECURITY] [DSA 664-1] New cpio packages fix insecure file permissions
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
Debian Security Advisory DSA 664-1 security@debian.org
http://www.debian.org/security/ Martin Schulze
February 2nd, 2005 http://www.debian.org/security/faq
- --------------------------------------------------------------------------
Package : cpio
Vulnerability : broken file permissions
Problem-Type : local
Debian-specific: no
CVE ID : CAN-1999-1572
It has been discovered, that cpio, a program to manage archives of
files, creates output files with -O and -F with broken permissions due
to a reset zero umask which allows local users to read or overwrite
those files.
For the stable distribution (woody) this problem has been fixed in
version 2.4.2-39woody1
For the unstable distribution (sid) this problem will be fixed soon.
We recommend that you upgrade your cpio 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
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Source archives:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1.dsc
Size/MD5 checksum: 549 45ee6d04cffc59c6e0d125ab269d8672
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1.diff.gz
Size/MD5 checksum: 22965 a5db2ad1ec00b2825bbdf4f0acaf8a84
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2.orig.tar.gz
Size/MD5 checksum: 181728 3e976db71229d52a8a135540698052df
Alpha architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_alpha.deb
Size/MD5 checksum: 73064 029c7d1de8bff5d6f63c7702455c0e17
ARM architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_arm.deb
Size/MD5 checksum: 63746 05f2cee18a28822b4fbe0d54f2b0efcf
Intel IA-32 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_i386.deb
Size/MD5 checksum: 61382 2011b7b05347a22780fe5a2d2da77923
Intel IA-64 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_ia64.deb
Size/MD5 checksum: 84938 173755073bd59fee905debce08456824
HP Precision architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_hppa.deb
Size/MD5 checksum: 69512 e950b2aa1f51a0f9412c319888882496
Motorola 680x0 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_m68k.deb
Size/MD5 checksum: 59714 c6c591c1839c464fb0cb2294d1758875
Big endian MIPS architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_mips.deb
Size/MD5 checksum: 69094 8aee70b66943403293252649d4879134
Little endian MIPS architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_mipsel.deb
Size/MD5 checksum: 68806 9e761f1fe3d156c5c557d3a28d51ab37
PowerPC architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_powerpc.deb
Size/MD5 checksum: 64084 f0fa8bf78610ed20b6135b4c7c04436c
IBM S/390 architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_s390.deb
Size/MD5 checksum: 63866 ba0b403eaee5bcd05d8d0cbf3c48cfcb
Sun Sparc architecture:
http://security.debian.org/pool/updates/main/c/cpio/cpio_2.4.2-39woody1_sparc.deb
Size/MD5 checksum: 65818 f5e0c10d8e46321e8c584454402512c5
These files will probably be moved into the stable distribution on
its next update.
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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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