drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Mehrere Probleme in eCryptfs
Name: |
Mehrere Probleme in eCryptfs |
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ID: |
USN-1188-1 |
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Distribution: |
Ubuntu |
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Plattformen: |
Ubuntu 10.04 LTS, Ubuntu 10.10, Ubuntu 11.04 |
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Datum: |
Mi, 10. August 2011, 07:51 |
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Referenzen: |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1831
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1832
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1833
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1834
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1835
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1836
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-1837 |
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Applikationen: |
eCryptfs |
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Originalnachricht |
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========================================================================== Ubuntu Security Notice USN-1188-1 August 09, 2011
ecryptfs-utils vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04 - Ubuntu 10.10 - Ubuntu 10.04 LTS
Summary:
eCryptfs could be tricked into mounting and unmounting arbitrary locations, and possibly disclose confidential information.
Software Description: - ecryptfs-utils: ecryptfs cryptographic filesystem (utilities)
Details:
Vasiliy Kulikov and Dan Rosenberg discovered that eCryptfs incorrectly validated permissions on the requested mountpoint. A local attacker could use this flaw to mount to arbitrary locations, leading to privilege escalation. (CVE-2011-1831)
Vasiliy Kulikov and Dan Rosenberg discovered that eCryptfs incorrectly validated permissions on the requested mountpoint. A local attacker could use this flaw to unmount to arbitrary locations, leading to a denial of service. (CVE-2011-1832)
Vasiliy Kulikov and Dan Rosenberg discovered that eCryptfs incorrectly validated permissions on the requested source directory. A local attacker could use this flaw to mount an arbitrary directory, possibly leading to information disclosure. A pending kernel update will provide the other half of the fix for this issue. (CVE-2011-1833)
Dan Rosenberg and Marc Deslauriers discovered that eCryptfs incorrectly handled modifications to the mtab file when an error occurs. A local attacker could use this flaw to corrupt the mtab file, and possibly unmount arbitrary locations, leading to a denial of service. (CVE-2011-1834)
Marc Deslauriers discovered that eCryptfs incorrectly handled keys when setting up an encrypted private directory. A local attacker could use this flaw to manipulate keys during creation of a new user. (CVE-2011-1835)
Marc Deslauriers discovered that eCryptfs incorrectly handled permissions during recovery. A local attacker could use this flaw to possibly access another user's data during the recovery process. This issue only applied to Ubuntu 11.04. (CVE-2011-1836)
Vasiliy Kulikov discovered that eCryptfs incorrectly handled lock counters. A local attacker could use this flaw to possibly overwrite arbitrary files. The default symlink restrictions in Ubuntu 10.10 and 11.04 should protect against this issue. (CVE-2011-1837)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 11.04: ecryptfs-utils 87-0ubuntu1.1
Ubuntu 10.10: ecryptfs-utils 83-0ubuntu3.2.10.10.1
Ubuntu 10.04 LTS: ecryptfs-utils 83-0ubuntu3.2.10.04.1
In general, a standard system update will make all the necessary changes.
References: http://www.ubuntu.com/usn/usn-1188-1 CVE-2011-1831, CVE-2011-1832, CVE-2011-1833, CVE-2011-1834, CVE-2011-1835, CVE-2011-1836, CVE-2011-1837
Package Information: https://launchpad.net/ubuntu/+source/ecryptfs-utils/87-0ubuntu1.1 https://launchpad.net/ubuntu/+source/ecryptfs-utils/83-0ubuntu3.2.10.10.1 https://launchpad.net/ubuntu/+source/ecryptfs-utils/83-0ubuntu3.2.10.04.1
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