Executive Summary

Summary
Title kexec-tools security, bug fix, and enhancement update
Informations
Name RHSA-2015:0986 First vendor Publication 2015-05-12
Vendor RedHat Last vendor Modification 2015-05-12
Severity (Vendor) Moderate Revision 01

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:N/I:P/A:P)
Cvss Base Score 3.6 Attack Range Local
Cvss Impact Score 4.9 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated kexec-tools packages that fix one security issue, one bug, and add one enhancement are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - 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 kexec-tools packages contain the /sbin/kexec binary and utilities that together form the user-space component of the kernel's kexec feature. The /sbin/kexec binary facilitates a new kernel to boot using the kernel's kexec feature either on a normal or a panic reboot. The kexec fastboot mechanism allows booting a Linux kernel from the context of an already running kernel.

It was found that the module-setup.sh script provided by kexec-tools created temporary files in an insecure way. A malicious, local user could use this flaw to conduct a symbolic link attack, allowing them to overwrite the contents of arbitrary files. (CVE-2015-0267)

This issue was discovered by Harald Hoyer of Red Hat.

This update also fixes the following bug:

* On Red Hat Enterprise Linux Atomic Host systems, the kdump tool previously saved kernel crash dumps in the /sysroot/crash file instead of the /var/crash file. The parsing error that caused this problem has been fixed, and the kernel crash dumps are now correctly saved in /var/crash. (BZ#1206464)

In addition, this update adds the following enhancement:

* The makedumpfile command now supports the new sadump format that can represent more than 16 TB of physical memory space. This allows users of makedumpfile to read dump files over 16 TB, generated by sadump on certain upcoming server models. (BZ#1208753)

All kexec-tools users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add this enhancement.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

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

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

1191575 - CVE-2015-0267 kexec-tools: insecure use of /tmp/*$$* filenames

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2015-0986.html

Nessus® Vulnerability Scanner

Date Description
2015-05-14 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20150512_kexec_tools_on_SL7_x.nasl - Type : ACT_GATHER_INFO
2015-05-13 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2015-0986.nasl - Type : ACT_GATHER_INFO
2015-05-13 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2015-0986.nasl - Type : ACT_GATHER_INFO
2015-05-13 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2015-0986.nasl - Type : ACT_GATHER_INFO

Alert History

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0
1
Date Informations
2015-12-05 13:27:59
  • Multiple Updates
2015-06-15 13:27:50
  • First insertion