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Red Hat Enterprise Linux 7 RHSA-2016-2593-02 Low: Sudo Info Leak

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Calendar Grey November 3, 2016
Scroller Redhat
The advisory from Red Hat details a minor update for sudo, focusing on essential bug repairs aimed at eliminating data exposure risks.
An update for sudo is now available for Red Hat Enterprise Linux 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory information leak system management bug fix Red Hat Enterprise Linux Low severity sudo update

References

https://access.redhat.com/security/cve/CVE-2016-7091 https://access.redhat.com/security/updates/classification#low https://docs.redhat.com/en/documentation/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: sudo-1.8.6p7-20.el7.src.rpm
x86_64: sudo-1.8.6p7-20.el7.x86_64.rpm sudo-debuginfo-1.8.6p7-20.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: sudo-debuginfo-1.8.6p7-20.el7.i686.rpm sudo-debuginfo-1.8.6p7-20.el7.x86_64.rpm sudo-devel-1.8.6p7-20.el7.i686.rpm sudo-devel-1.8.6p7-20.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: sudo-1.8.6p7-20.el7.src.rpm
x86_64: sudo-1.8.6p7-20.el7.x86_64.rpm sudo-debuginfo-1.8.6p7-20.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: sudo-debuginfo-1.8.6p7-20.el7.i686.rpm sudo-debuginfo-1.8.6p7-20.el7.x86_64.rpm sudo-devel-1.8.6p7-20.el7.i686.rpm sudo-devel-1.8.6p7-20.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: sudo-1.8.6p7-20.el7.src.rpm
aarch64: sudo-1.8.6p7-20.el7.aarch64.rpm sudo-debuginfo-1.8.6p7-20.el7.aarch64.rpm
ppc64: sudo-1.8.6p7-20.el7.ppc64.rpm sudo-debuginfo-1.8.6p7-20.el7.ppc64.rpm
ppc64le: sudo-1.8.6p7-20.el7.ppc64le.rpm sudo-debuginfo-1.8.6p7-20.el7.ppc64le.rpm
s390x: sudo-1.8.6p7-20.el7.s390x.rpm sudo-debuginfo-1.8.6p7-20.el7.s390x.rpm
x86_64: sudo-1.8.6p7-20.el7.x86_64.rpm sudo-debuginfo-1.8.6p7-20.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
aarch64:

Read the Full Advisory


Severity
low
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:2593-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2593.html
Issue date: 2016-11-03

Topic

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 impactof Low. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory information leak system management bug fix Red Hat Enterprise Linux Low severity sudo update

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

Bugs Fixed

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

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