drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Unsichere Verwendung temporärer Dateien in lvm und davfs2
Name: |
Unsichere Verwendung temporärer Dateien in lvm und davfs2
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ID: |
200411-22 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
Fr, 12. November 2004, 12:00 |
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Referenzen: |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0972 |
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Applikationen: |
DAVfs Linux file system driver |
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Originalnachricht |
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200411-22 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: Davfs2, lvm-user: Insecure tempfile handling Date: November 11, 2004 Bugs: #68406, #69149 ID: 200411-22
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Synopsis ========
Davfs2 and the lvmcreate_initrd script (included in the lvm-user package) are both vulnerable to symlink attacks, potentially allowing a local user to overwrite arbitrary files with the rights of the user running them.
Background ==========
Davfs2 is a file system driver that allows you to mount a WebDAV server as a local disk drive. lvm-user is a package providing userland utilities for LVM (Logical Volume Management) 1.x features.
Affected packages =================
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-fs/davfs2 < 0.2.2-r1 >= 0.2.2-r1 2 sys-fs/lvm-user < 1.0.7-r2 >= 1.0.7-r2 ------------------------------------------------------------------- 2 affected packages on all of their supported architectures. -------------------------------------------------------------------
Description ===========
Florian Schilhabel from the Gentoo Linux Security Audit Team found that Davfs2 insecurely created .pid files in /tmp. Furthermore, Trustix Secure Linux found that the lvmcreate_initrd script, included in the lvm-user Gentoo package, also creates temporary files in world-writeable directories with predictable names.
Impact ======
A local attacker could create symbolic links in the temporary files directory, pointing to a valid file somewhere on the filesystem. When Davfs2 or lvmcreate_initrd is called, this would result in the file being overwritten with the rights of the user running the software, which could be the root user.
Workaround ==========
There is no known workaround at this time.
Resolution ==========
All Davfs2 users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-fs/davfs2-0.2.2-r1"
All lvm-user users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-fs/lvm-user-1.0.7-r2"
References ==========
[ 1 ] CAN-2004-0972 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0972
Availability ============
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200411-22.xml
Concerns? =========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
License =======
Copyright 2004 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.0
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