SUSE update for systemd

Published: 2021-08-23

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-13529 CVE-2021-33910
CWE-ID	CWE-341 CWE-789
Exploitation vector	Local network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software Subscribe	SUSE Linux Enterprise Module for Basesystem Operating systems & Components / Operating system systemd-32bit-debuginfo Operating systems & Components / Operating system package or component systemd-32bit Operating systems & Components / Operating system package or component libudev1-32bit-debuginfo Operating systems & Components / Operating system package or component libudev1-32bit Operating systems & Components / Operating system package or component libsystemd0-32bit-debuginfo Operating systems & Components / Operating system package or component libsystemd0-32bit Operating systems & Components / Operating system package or component systemd-lang Operating systems & Components / Operating system package or component udev-debuginfo Operating systems & Components / Operating system package or component udev Operating systems & Components / Operating system package or component systemd-sysvinit Operating systems & Components / Operating system package or component systemd-journal-remote-debuginfo Operating systems & Components / Operating system package or component systemd-journal-remote Operating systems & Components / Operating system package or component systemd-doc Operating systems & Components / Operating system package or component systemd-devel Operating systems & Components / Operating system package or component systemd-debugsource Operating systems & Components / Operating system package or component systemd-debuginfo Operating systems & Components / Operating system package or component systemd-coredump-debuginfo Operating systems & Components / Operating system package or component systemd-coredump Operating systems & Components / Operating system package or component systemd-container-debuginfo Operating systems & Components / Operating system package or component systemd-container Operating systems & Components / Operating system package or component systemd Operating systems & Components / Operating system package or component libudev1-debuginfo Operating systems & Components / Operating system package or component libudev1 Operating systems & Components / Operating system package or component libudev-devel Operating systems & Components / Operating system package or component libsystemd0-debuginfo Operating systems & Components / Operating system package or component libsystemd0 Operating systems & Components / Operating system package or component
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Predictable from Observable State

EUVDB-ID: #VU52596

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-13529

CWE-ID: CWE-341 - Predictable from Observable State

Exploit availability: No

Description

The vulnerability allows a remote attacker to reconfigure the target device.

The vulnerability exists due to usage of predictable Transactions Identifiers when processing DHCP ACK packets. A remote attacker on the same network can forge the FORCERENEW and DHCP ACK packets to reconfigure the systemd’s DHCP client settings.

Mitigation

Update the affected package systemd to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Basesystem: 15-SP3

systemd-32bit-debuginfo: before 246.15-7.11.1

systemd-32bit: before 246.15-7.11.1

libudev1-32bit-debuginfo: before 246.15-7.11.1

libudev1-32bit: before 246.15-7.11.1

libsystemd0-32bit-debuginfo: before 246.15-7.11.1

libsystemd0-32bit: before 246.15-7.11.1

systemd-lang: before 246.15-7.11.1

udev-debuginfo: before 246.15-7.11.1

udev: before 246.15-7.11.1

systemd-sysvinit: before 246.15-7.11.1

systemd-journal-remote-debuginfo: before 246.15-7.11.1

systemd-journal-remote: before 246.15-7.11.1

systemd-doc: before 246.15-7.11.1

systemd-devel: before 246.15-7.11.1

systemd-debugsource: before 246.15-7.11.1

systemd-debuginfo: before 246.15-7.11.1

systemd-coredump-debuginfo: before 246.15-7.11.1

systemd-coredump: before 246.15-7.11.1

systemd-container-debuginfo: before 246.15-7.11.1

systemd-container: before 246.15-7.11.1

systemd: before 246.15-7.11.1

libudev1-debuginfo: before 246.15-7.11.1

libudev1: before 246.15-7.11.1

libudev-devel: before 246.15-7.11.1

libsystemd0-debuginfo: before 246.15-7.11.1

libsystemd0: before 246.15-7.11.1

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20212809-1/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Uncontrolled Memory Allocation

EUVDB-ID: #VU55034

Risk: Low

CVSSv3.1: 5 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-33910

CWE-ID: CWE-789 - Uncontrolled Memory Allocation

Exploit availability: Yes

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to stack exhaustion within the basic/unit-name.c in systemd. A local user can crash the systemd (PID 1) and cause a kernel panic.

Mitigation

Update the affected package systemd to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Basesystem: 15-SP3

systemd-32bit-debuginfo: before 246.15-7.11.1

systemd-32bit: before 246.15-7.11.1

libudev1-32bit-debuginfo: before 246.15-7.11.1

libudev1-32bit: before 246.15-7.11.1

libsystemd0-32bit-debuginfo: before 246.15-7.11.1

libsystemd0-32bit: before 246.15-7.11.1

systemd-lang: before 246.15-7.11.1

udev-debuginfo: before 246.15-7.11.1

udev: before 246.15-7.11.1

systemd-sysvinit: before 246.15-7.11.1

systemd-journal-remote-debuginfo: before 246.15-7.11.1

systemd-journal-remote: before 246.15-7.11.1

systemd-doc: before 246.15-7.11.1

systemd-devel: before 246.15-7.11.1

systemd-debugsource: before 246.15-7.11.1

systemd-debuginfo: before 246.15-7.11.1

systemd-coredump-debuginfo: before 246.15-7.11.1

systemd-coredump: before 246.15-7.11.1

systemd-container-debuginfo: before 246.15-7.11.1

systemd-container: before 246.15-7.11.1

systemd: before 246.15-7.11.1

libudev1-debuginfo: before 246.15-7.11.1

libudev1: before 246.15-7.11.1

libudev-devel: before 246.15-7.11.1

libsystemd0-debuginfo: before 246.15-7.11.1

libsystemd0: before 246.15-7.11.1

External links

http://www.suse.com/support/update/announcement/2021/suse-su-20212809-1/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.