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RedHat: RHSA-2021-2724-01 Critical: Systemd Stack Allocation Crash

red hat
Calendar Grey July 20, 2021
Dist Redhat Esm H88
An important security upgrade for the systemd component of Red Hat Enterprise Linux, addressing significant vulnerabilities and delivering effective remedies.
An update for systemd is now available for Red Hat Enterprise Linux 8.1 Extended Update Support

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 systemd packages contain systemd, a system and service manager for Linux, compatible with the SysV and LSB init scripts. It provides aggressive parallelism capabilities, uses socket and D-Bus activation for starting services, offers on-demand starting of daemons, and keeps track of processes using Linux cgroups. In addition, it supports snapshotting and restoring of the system state, maintains mount and automount points, and implements an elaborate transactional dependency-based service control logic. It can also work as a drop-in replacement for sysvinit.
Security Fix(es):
* systemd: uncontrolled allocation on the stack in function unit_name_path_escape leads to crash (CVE-2021-33910)
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.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux important system update crash issue systemd stack allocation

References

https://access.redhat.com/security/cve/CVE-2021-33910 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/RHSB-2021-006

Package List

Red Hat Enterprise Linux BaseOS EUS (v. 8.1):
Source: systemd-239-18.el8_1.8.src.rpm
aarch64: systemd-239-18.el8_1.8.aarch64.rpm systemd-container-239-18.el8_1.8.aarch64.rpm systemd-container-debuginfo-239-18.el8_1.8.aarch64.rpm systemd-debuginfo-239-18.el8_1.8.aarch64.rpm systemd-debugsource-239-18.el8_1.8.aarch64.rpm systemd-devel-239-18.el8_1.8.aarch64.rpm systemd-journal-remote-239-18.el8_1.8.aarch64.rpm systemd-journal-remote-debuginfo-239-18.el8_1.8.aarch64.rpm systemd-libs-239-18.el8_1.8.aarch64.rpm systemd-libs-debuginfo-239-18.el8_1.8.aarch64.rpm systemd-pam-239-18.el8_1.8.aarch64.rpm systemd-pam-debuginfo-239-18.el8_1.8.aarch64.rpm systemd-tests-239-18.el8_1.8.aarch64.rpm systemd-tests-debuginfo-239-18.el8_1.8.aarch64.rpm systemd-udev-239-18.el8_1.8.aarch64.rpm systemd-udev-debuginfo-239-18.el8_1.8.aarch64.rpm
ppc64le: systemd-239-18.el8_1.8.ppc64le.rpm systemd-container-239-18.el8_1.8.ppc64le.rpm systemd-container-debuginfo-239-18.el8_1.8.ppc64le.rpm systemd-debuginfo-239-18.el8_1.8.ppc64le.rpm systemd-debugsource-239-18.el8_1.8.ppc64le.rpm systemd-devel-239-18.el8_1.8.ppc64le.rpm systemd-journal-remote-239-18.el8_1.8.ppc64le.rpm systemd-journal-remote-debuginfo-239-18.el8_1.8.ppc64le.rpm systemd-libs-239-18.el8_1.8.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2724-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2724
Issue date: 2021-07-20

Topic

An update for systemd is now available for Red Hat Enterprise Linux 8.1Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux important system update crash issue systemd stack allocation

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS EUS (v. 8.1) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1970887 - CVE-2021-33910 systemd: uncontrolled allocation on the stack in function unit_name_path_escape leads to crash

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