4.7 - RHSA-2016:2605

Problem Description:

An update for util-linux is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

The util-linux packages contain a large variety of low-level system utilities that are necessary for a Linux system to function. Among others, these include the fdisk configuration tool and the login program.

Security Fix(es):

* It was found that util-linux's libblkid library did not properly handle Extended Boot Record (EBR) partitions when reading MS-DOS partition tables. An attacker with physical USB access to a protected machine could insert a storage device with a specially crafted partition table that could, for example, trigger an infinite loop in systemd-udevd, resulting in a denial of service on that machine. (CVE-2016-5011)

Red Hat would like to thank Michael Gruhn for reporting this issue. Upstream acknowledges Christian Moch as the original reporter.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1007734 - blkid shows devices as /dev/block/$MAJOR:$MINOR 1029385 - lack of non-ascii support 1248003 - mount only parses = lines from fstab fs_spec field available from blkid block device 1271850 - mount -a doesn't catch a typo in /etc/fstab and a typo in /etc/fstab can make a system not reboot properly 1290689 - util-linux: /bin/login does not retry getpwnam_r with larger buffers, leading to login failure 1291554 - lslogins crash when executed with buggy username 1296366 - Bash completion for more(1) handles file names with spaces incorrectly 1296521 - RHEL7: update audit event in hwclock 1301091 - [libblkid] Failed to get offset of the xfs_external_log signature 1304426 - [rfe] /bin/su should be improved to reduce stack use 1327886 - Backport blkdiscard's "-z" flag to RHEL 1335671 - extra quotes around UUID confuses findfs in RHEL (but not in Fedora) 1344482 - util-linux fails valid_pmbr() size checks if device is > 2.14TB, Device label type: dos instead of gpt 1349536 - Extended partition loop in MBR partition table leads to DOS 1349741 - CVE-2016-5011 util-linux: Extended partition loop in MBR partition table leads to DOS