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Sicherheit: Race Condition in chfn und chsh
Aktuelle Meldungen Distributionen
Name: Race Condition in chfn und chsh
ID: MDKSA-2002:047
Distribution: Mandrake
Plattformen: Mandrake 7.1, Mandrake 7.2, Mandrake Corporate Server 1.0.1, Mandrake 8.0, Mandrake Single Network Firewall 7.2, Mandrake 8.1, Mandrake 8.2
Datum: Fr, 9. August 2002, 13:00
Referenzen: Keine Angabe
Applikationen: util-linux

Originalnachricht

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________________________________________________________________________

Mandrake Linux Security Update Advisory
________________________________________________________________________

Package name: util-linux
Advisory ID: MDKSA-2002:047
Date: August 8th, 2002
Affected versions: 7.1, 7.2, 8.0, 8.1, 8.2, Corporate Server 1.0.1,
Single Network Firewall 7.2
________________________________________________________________________

Problem Description:

Michal Zalewski found a vulnerability in the util-linux package with
the chfn utility. This utility allows users to modify some information
in the /etc/passwd file, and is installed setuid root. Using a
carefully crafted attack sequence, an attacker can exploit a complex
file locking and modification race that would allow them to make
changes to the /etc/passwd file. To successfully exploit this
vulnerability and obtain privilege escalation, there is a need for some
administrator interaction, and the password file must over over 4kb in
size; the attacker's entry cannot be in the last 4kb of the file.
________________________________________________________________________

References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0638
http://www.kb.cert.org/vuls/id/405955
________________________________________________________________________

Updated Packages:

Linux-Mandrake 7.1:
4c5df1947b62460beb8df7592ef35c6e 7.1/RPMS/util-linux-2.10o-6.1mdk.i586.rpm
fa4fd5a20bc4cbca324294e3ed712eb1 7.1/SRPMS/util-linux-2.10o-6.1mdk.src.rpm

Linux-Mandrake 7.2:
69f07cace4649f3d8326ea8866d95e4f 7.2/RPMS/util-linux-2.10o-6.1mdk.i586.rpm
fa4fd5a20bc4cbca324294e3ed712eb1 7.2/SRPMS/util-linux-2.10o-6.1mdk.src.rpm

Mandrake Linux 8.0:
18a2dc6e74636bdf6b7be146dfa3d6cf 8.0/RPMS/util-linux-2.10s-3.2mdk.i586.rpm
dd4a423ddc444a202176b09e5251f6fd 8.0/SRPMS/util-linux-2.10s-3.2mdk.src.rpm

Mandrake Linux 8.0/ppc:
55e49d1ad321c229a8468f11a43b2fb7 ppc/8.0/RPMS/util-linux-2.11h-3.5mdk.ppc.rpm
25c5b47d39f8b1c0147930218ddaecd5
ppc/8.0/SRPMS/util-linux-2.11h-3.5mdk.src.rpm

Mandrake Linux 8.1:
889ba34fcb46d9c2c2f11cf4fa81dd23 8.1/RPMS/util-linux-2.11h-3.5mdk.i586.rpm
25c5b47d39f8b1c0147930218ddaecd5 8.1/SRPMS/util-linux-2.11h-3.5mdk.src.rpm

Mandrake Linux 8.1/ia64:
2405d127006eef10e1d58e23866f0044
ia64/8.1/RPMS/util-linux-2.11h-3.5mdk.ia64.rpm
25c5b47d39f8b1c0147930218ddaecd5
ia64/8.1/SRPMS/util-linux-2.11h-3.5mdk.src.rpm

Mandrake Linux 8.2:
f137a274c2969ca3b893e96902dee893 8.2/RPMS/losetup-2.11n-4.3mdk.i586.rpm
c074a07a7f3c3fd92b0be2ebd02dff93 8.2/RPMS/mount-2.11n-4.3mdk.i586.rpm
420c1537cb8260f984125fd6311dc3d1 8.2/RPMS/util-linux-2.11n-4.3mdk.i586.rpm
240139061f653327735eb46c3009d245 8.2/SRPMS/util-linux-2.11n-4.3mdk.src.rpm

Mandrake Linux 8.2/ppc:
9260b9deba8a1e025e028217f99df3ed ppc/8.2/RPMS/losetup-2.11n-4.3mdk.ppc.rpm
abdbafa149f499409c31969ff081e818 ppc/8.2/RPMS/mount-2.11n-4.3mdk.ppc.rpm
3adff58b4e961fa17c8be1d1224072a2 ppc/8.2/RPMS/util-linux-2.11n-4.3mdk.ppc.rpm
240139061f653327735eb46c3009d245
ppc/8.2/SRPMS/util-linux-2.11n-4.3mdk.src.rpm

Corporate Server 1.0.1:
4c5df1947b62460beb8df7592ef35c6e 1.0.1/RPMS/util-linux-2.10o-6.1mdk.i586.rpm
fa4fd5a20bc4cbca324294e3ed712eb1 1.0.1/SRPMS/util-linux-2.10o-6.1mdk.src.rpm

Single Network Firewall 7.2:
69f07cace4649f3d8326ea8866d95e4f snf7.2/RPMS/util-linux-2.10o-6.1mdk.i586.rpm
fa4fd5a20bc4cbca324294e3ed712eb1 snf7.2/SRPMS/util-linux-2.10o-6.1mdk.src.rpm
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):

________________________________________________________________________

To upgrade automatically, use MandrakeUpdate. The verification of md5
checksums and GPG signatures is performed automatically for you.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of
FTP mirrors can be obtained from:

http://www.mandrakesecure.net/en/ftp.php

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package. You can do this with the command:

rpm --checksig <filename>

All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team from:

https://www.mandrakesecure.net/RPM-GPG-KEYS

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:

http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

security@linux-mandrake.com
________________________________________________________________________

Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security@linux-mandrake.com>


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