Scientific Linux Security Update : ecryptfs-utils on SL5.x, SL6.x i386/x86_64

High Nessus Plugin ID 61124

Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

eCryptfs is a stacked, cryptographic file system. It is transparent to the underlying file system and provides per-file granularity.

The setuid mount.ecryptfs_private utility allows users to mount an eCryptfs file system. This utility can only be run by users in the 'ecryptfs' group.

A race condition flaw was found in the way mount.ecryptfs_private checked the permissions of a requested mount point when mounting an encrypted file system. A local attacker could possibly use this flaw to escalate their privileges by mounting over an arbitrary directory.
(CVE-2011-1831)

A race condition flaw in umount.ecryptfs_private could allow a local attacker to unmount an arbitrary file system. (CVE-2011-1832)

It was found that mount.ecryptfs_private did not handle certain errors correctly when updating the mtab (mounted file systems table) file, allowing a local attacker to corrupt the mtab file and possibly unmount an arbitrary file system. (CVE-2011-1834)

An insecure temporary file use flaw was found in the ecryptfs-setup-private script. A local attacker could use this script to insert their own key that will subsequently be used by a new user, possibly giving the attacker access to the user's encrypted data if existing file permissions allow access. (CVE-2011-1835)

A race condition flaw in mount.ecryptfs_private could allow a local attacker to overwrite arbitrary files. (CVE-2011-1837)

A race condition flaw in the way temporary files were accessed in mount.ecryptfs_private could allow a malicious, local user to make arbitrary modifications to the mtab file. (CVE-2011-3145)

A race condition flaw was found in the way mount.ecryptfs_private checked the permissions of the directory to mount. A local attacker could use this flaw to mount (and then access) a directory they would otherwise not have access to. Note: The fix for this issue is incomplete until a kernel-space change is made. Future Scientific Linux 5 and 6 kernel updates will correct this issue. (CVE-2011-1833)

Users of ecryptfs-utils are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?4fe712e0

Plugin Details

Severity: High

ID: 61124

File Name: sl_20110831_ecryptfs_utils_on_SL5_x.nasl

Version: 1.7

Type: local

Agent: unix

Published: 2012/08/01

Updated: 2019/10/25

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.0

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2011/08/31

Vulnerability Publication Date: 2014/02/15

Reference Information

CVE: CVE-2011-1831, CVE-2011-3145