Executive Summary

Summary
Title sudo security, bug fix, and enhancement update
Informations
Name RHSA-2016:2593 First vendor Publication 2016-11-03
Vendor RedHat Last vendor Modification 2016-11-03
Severity (Vendor) N/A Revision 02

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:C/I:N/A:N)
Cvss Base Score 4.9 Attack Range Local
Cvss Impact Score 6.9 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

An update for sudo 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 sudo packages contain the sudo utility which allows system administrators to provide certain users with the permission to execute privileged commands, which are used for system management purposes, without having to log in as root.

Security Fix(es):

* It was discovered that the default sudo configuration preserved the value of INPUTRC from the user's environment, which could lead to information disclosure. A local user with sudo access to a restricted program that uses readline could use this flaw to read content from specially formatted files with elevated privileges provided by sudo. (CVE-2016-7091)

Note: With this update, INPUTRC was removed from the env_keep list in /etc/sudoers to avoid having sudo preserve the value of this variable when invoking privileged commands.

Red Hat would like to thank Grisha Levit for reporting this issue.

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/):

1196451 - default requiretty is problematic and breaks valid usage 1261998 - visudo accept non valid content 1268958 - sudo - cmnd_no_wait can cause child processes to ignore SIGPIPE 1334360 - sudo option mail_no_user doesn't work 1339935 - CVE-2016-7091 sudo: Possible info leak via INPUTRC 1350828 - [RHEL7] visudo ignores -q flag

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2016-2593.html

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-200 Information Exposure

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 1
Os 1
Os 1
Os 1
Os 1

Nessus® Vulnerability Scanner

Date Description
2017-05-01 Name : The remote EulerOS host is missing a security update.
File : EulerOS_SA-2016-1055.nasl - Type : ACT_GATHER_INFO
2016-12-15 Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20161103_sudo_on_SL7_x.nasl - Type : ACT_GATHER_INFO
2016-11-28 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2016-2593.nasl - Type : ACT_GATHER_INFO
2016-11-11 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2016-2593.nasl - Type : ACT_GATHER_INFO
2016-11-04 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2016-2593.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2016-12-23 21:25:18
  • Multiple Updates
2016-12-23 05:25:02
  • Multiple Updates
2016-11-29 13:23:41
  • Multiple Updates
2016-11-12 13:25:32
  • Multiple Updates
2016-11-05 13:24:39
  • Multiple Updates
2016-11-03 13:22:44
  • First insertion