sudo: Multiple vulnerabilities

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                         ZMCIRT Vulnerability Bulletin

                             ZMC-2021.05.19.0700
                      sudo: Multiple vulnerabilities
                               19th May 2021

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Product:           sudo
Publisher:         Red Hat
Operating System:  Red Hat
Impact/Access:     Increased Privileges     -- Existing Account
                   Modify Arbitrary Files   -- Existing Account
                   Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-23240 CVE-2021-23239 

Reference:         ESB-2021.0313
                   ESB-2021.0307
                   ESB-2021.0287

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2021:1723


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Hash: SHA256

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                   Red Hat Security Advisory

Synopsis:          Low: sudo security and bug fix update
Advisory ID:       RHSA-2021:1723-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1723
Issue date:        2021-05-18
CVE Names:         CVE-2021-23239 CVE-2021-23240 
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1. Summary:

An update for sudo is now available for Red Hat Enterprise Linux 8.

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 BaseOS (v. 8) - aarch64, ppc64le, 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):

* sudo: symbolic link attack in SELinux-enabled sudoedit (CVE-2021-23240)

* sudo: possible directory existence test due to race condition in sudoedit
(CVE-2021-23239)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.4 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/):

1915052 - CVE-2021-23239 sudo: possible directory existence test due to race condition in sudoedit
1915053 - CVE-2021-23240 sudo: symbolic link attack in SELinux-enabled sudoedit
1923825 - Upstream URL need to be updated

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
sudo-1.8.29-7.el8.src.rpm

aarch64:
sudo-1.8.29-7.el8.aarch64.rpm
sudo-debuginfo-1.8.29-7.el8.aarch64.rpm
sudo-debugsource-1.8.29-7.el8.aarch64.rpm

ppc64le:
sudo-1.8.29-7.el8.ppc64le.rpm
sudo-debuginfo-1.8.29-7.el8.ppc64le.rpm
sudo-debugsource-1.8.29-7.el8.ppc64le.rpm

s390x:
sudo-1.8.29-7.el8.s390x.rpm
sudo-debuginfo-1.8.29-7.el8.s390x.rpm
sudo-debugsource-1.8.29-7.el8.s390x.rpm

x86_64:
sudo-1.8.29-7.el8.x86_64.rpm
sudo-debuginfo-1.8.29-7.el8.x86_64.rpm
sudo-debugsource-1.8.29-7.el8.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-2021-23239
https://access.redhat.com/security/cve/CVE-2021-23240
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/



 
ZMCIRT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. ZMCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

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