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Category:   Application (Generic)  >   Sudo Vendors:   sudo.ws
(Red Hat Issues Fix) Sudo get_process_ttyname() Command Validation Flaw Lets Local Users Obtain Root Privileges
SecurityTracker Alert ID:  1038583
SecurityTracker URL:  http://securitytracker.com/id/1038583
CVE Reference:   CVE-2017-1000367, CVE-2017-1000368   (Links to External Site)
Date:  May 30 2017
Impact:   Modification of system information, Modification of user information, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.8.6p7 through 1.8.20
Description:   A vulnerability was reported in Sudo. A local user can obtain root privileges on the target system.

A local user can issue a specially crafted sudo command to trigger a command validation flaw in the get_process_ttyname() process and cause the system to recognize the user's tty as an arbitrary file on the target system. A local user can exploit this to overwrite arbitrary files on the target system.

Systems with SELinux enabled and with sudo built with SELinux support are affected.

Qualys, Inc. reported this vulnerability.

Impact:   A local user can overwrite arbitrary files with root privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://access.redhat.com/errata/RHSA-2017:1381

Vendor URL:  access.redhat.com/errata/RHSA-2017:1381 (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
May 30 2017 Sudo get_process_ttyname() Command Validation Flaw Lets Local Users Obtain Root Privileges



 Source Message Contents

Subject:  [RHSA-2017:1381-01] Important: sudo security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: sudo security update
Advisory ID:       RHSA-2017:1381-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1381
Issue date:        2017-05-30
CVE Names:         CVE-2017-1000367 
=====================================================================

1. Summary:

An update for sudo is now available for Red Hat Enterprise Linux 5 Extended
Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact
of Important. 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 Server (v. 5 ELS) - i386, s390x, 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):

* A flaw was found in the way sudo parsed tty information from the process
status file in the proc filesystem. A local user with privileges to execute
commands via sudo could use this flaw to escalate their privileges to root.
(CVE-2017-1000367)

Red Hat would like to thank Qualys Security for reporting this issue.

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/):

1453074 - CVE-2017-1000367  sudo: Privilege escalation in via improper get_process_ttyname() parsing

6. Package List:

Red Hat Enterprise Linux Server (v. 5 ELS):

Source:
sudo-1.7.2p1-30.el5_11.src.rpm

i386:
sudo-1.7.2p1-30.el5_11.i386.rpm
sudo-debuginfo-1.7.2p1-30.el5_11.i386.rpm

s390x:
sudo-1.7.2p1-30.el5_11.s390x.rpm
sudo-debuginfo-1.7.2p1-30.el5_11.s390x.rpm

x86_64:
sudo-1.7.2p1-30.el5_11.x86_64.rpm
sudo-debuginfo-1.7.2p1-30.el5_11.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-1000367
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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