[QSA-0524222] Security Update Bundle

Qlustar Security Advisory 0524222

May 24th, 2022


A Qlustar security update bundle is a cumulative update of packages that are taken from upstream Debian/Ubuntu without modification. Only packages that are used in a typical HPC/Storage cluster installation are mentioned in Qlustar Security Advisories. Other non-HPC related updates also enter the Qlustar repository, but their functionality is not separately verified by the Qlustar team. To track these updates subscribe to the general security mailing lists of Debian/Ubuntu and/or CentOS/AlmaLinux.

Package(s)       : see upstream description of individual package
Qlustar releases : 11.0, 12.0
Affected versions: All versions prior to this update
Vulnerability    : see upstream description of individual package
Problem type     : see upstream description of individual package
Qlustar-specific : no
CVE Id(s)        : see upstream description of individual package

This update includes several security related package updates from Debian/Ubuntu and CentOS/AlmaLinux. The following list provides references to the upstream security report of the corresponding packages. You can view the original upstream advisory by clicking on the corresponding title.

Relevant to Qlustar 12.0 and 11.0

Dnsmasq vulnerability

Petr Menšík and Richard Johnson discovered that Dnsmasq incorrectly handled certain inputs. An attacker could possibly use this issue to execute arbitrary code or expose sensitive information.

DBus vulnerability

Daniel Onaca discovered that DBus contained a use-after-free vulnerability, caused by the incorrect handling of usernames sharing the same UID. An attacker could possibly use this issue to cause DBus to crash, resulting in a denial of service.

Rsyslog vulnerability

Pieter Agten discovered that Rsyslog incorrectly handled certain requests. An attacker could possibly use this issue to cause a crash.

OpenSSL vulnerability

Elison Niven discovered that OpenSSL incorrectly handled the c_rehash script. A local attacker could possibly use this issue to execute arbitrary commands when c_rehash is run.

Bash vulnerability

It was discovered that Bash did not properly drop privileges when the binary had the setuid bit enabled. An attacker could possibly use this issue to escalate privileges.

CentOS 7.9 / AlmaLinux 8.5 security updates

Please check the CentOS mailing list for details about CentOS 7 updates and the AlmaLinux Errata site for details about AlmaLinux 8 updates that entered this release (everything from April 13th, 2022 to May 12th, 2022).

Update instructions:

The problem can be corrected by updating your system to the following or more recent package versions:

For Qlustar 12.0


For Qlustar 11.0


Special Update instructions:

In addition to the steps described in the general Qlustar Update Instructions these updates require the following:

  • On Qlustar 12: Also write the dnsmasq and slurm config with QluMan before rebooting. If your cluster was installed with a release earlier than you will have to generate new LDAP certificates at some point since the earlier ones were generated with a 1 year validity. Now they are generated with an unlimited validity. To check the expiration date execute
    # openssl x509 -dates -in /etc/ssl/certs/qlustar-ca-cert.pem | grep notAfter

    To regenerate the certificate with unlimited validity execute

    # qluman-ldap-cli --update-certs

    before rebooting the whole cluster.

  • On Qlustar 11: Also perform the manual steps ‘7. Migration to GRUB PXE booting’ and ‘11. Adjust root bash shell initialization’ as described in the Release Notes if you haven’t done so yet.