medium
4.6
CWE
264
Advisory Published
CVE Published
Updated

CVE-2011-1831

First published: Tue Aug 09 2011(Updated: )

A number of flaws were reported [1] in eCryptfs that could allow a user to mount or unmount arbitrary locations, and possibly disclose confidential information: Vasiliy Kulikov of Openwall 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. (<a href="https://access.redhat.com/security/cve/CVE-2011-1831">CVE-2011-1831</a>) Vasiliy Kulikov of Openwall 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. (<a href="https://access.redhat.com/security/cve/CVE-2011-1832">CVE-2011-1832</a>) Vasiliy Kulikov of Openwall 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. Note that this flaw also requires a fix in the kernel to be complete. (<a href="https://access.redhat.com/security/cve/CVE-2011-1833">CVE-2011-1833</a>) 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. (<a href="https://access.redhat.com/security/cve/CVE-2011-1834">CVE-2011-1834</a>) 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. (<a href="https://access.redhat.com/security/cve/CVE-2011-1835">CVE-2011-1835</a>) 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. (<a href="https://access.redhat.com/security/cve/CVE-2011-1836">CVE-2011-1836</a>) Vasiliy Kulikov of Openwall discovered that eCryptfs incorrectly handled lock counters. A local attacker could use this flaw to possibly overwrite arbitrary files. (<a href="https://access.redhat.com/security/cve/CVE-2011-1837">CVE-2011-1837</a>) [1] <a href="https://launchpad.net/bugs/732628">https://launchpad.net/bugs/732628</a>

Credit: security@ubuntu.com security@ubuntu.com

Affected SoftwareAffected VersionHow to fix
debian/ecryptfs-utils
111-5
111-6
111-7
eCryptfs-utils<=89
eCryptfs-utils=62
eCryptfs-utils=63
eCryptfs-utils=64
eCryptfs-utils=65
eCryptfs-utils=66
eCryptfs-utils=67
eCryptfs-utils=68
eCryptfs-utils=69
eCryptfs-utils=70
eCryptfs-utils=71
eCryptfs-utils=72
eCryptfs-utils=73
eCryptfs-utils=74
eCryptfs-utils=75
eCryptfs-utils=76
eCryptfs-utils=77
eCryptfs-utils=78
eCryptfs-utils=79
eCryptfs-utils=80
eCryptfs-utils=81
eCryptfs-utils=82
eCryptfs-utils=83
eCryptfs-utils=84
eCryptfs-utils=85
eCryptfs-utils=86
eCryptfs-utils=87
eCryptfs-utils=58
eCryptfs-utils=59
eCryptfs-utils=60
eCryptfs-utils=61

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