drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Überschreiben von Dateien in FUSE
Name: |
Überschreiben von Dateien in FUSE |
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ID: |
201603-04 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
Do, 10. März 2016, 06:50 |
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Referenzen: |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3202 |
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Applikationen: |
Filesystem in Userspace |
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Originalnachricht |
This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --TX3GQVIhIIWJ9p4qvjGTaSvpoFTRjpPTm Content-Type: text/plain; charset=utf- Content-Transfer-Encoding: quoted-printable
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201603-04 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal Title: FUSE: incorrect filtering of environment variables leading to privilege escalation Date: March 09, 2016 Bugs: #550152 ID: 201603-04
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Synopsis ========
The fusermount binary in FUSE does not properly clear the environment before invoking mount or umount as root that allows a local user to overwrite arbitrary files.
Background ==========
FUSE provides an interface for filesystems implemented in userspace.
Affected packages =================
------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-fs/fuse < 2.9.4 >= 2.9.4
Description ===========
The fusermount binary calls setuid(geteuid()) to reset the RUID when it invokes /bin/mount so that it can use privileged mount options that are normally restricted if RUID != EUID. FUSE does not properly clear environment variables before invoking mount or umount as root allowing this to be passed to operations using elevated privileges such as LIBMOUNT_MTAB that is used by the mount commands debugging feature.
Impact ======
The FUSE vulnerability allows a local, unprivileged user to overwrite arbitrary files on the system.
Workaround ==========
There is no known work around at this time.
Resolution ==========
All FUSE users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-fs/fuse-2.9.4"
References ==========
[ 1 ] CVE-2015-3202 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3202
Availability ============
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/201603-04
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 https://bugs.gentoo.org.
License =======
Copyright 2016 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/2.5
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