SUSE update for avahi

1) Infinite loop

EUVDB-ID: #VU79113

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3468

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

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

The vulnerability exists due to event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work() function. A local user can consume all available system resources and cause denial of service conditions.

Mitigation

Update the affected package avahi to the latest version.

Vulnerable software versions

SUSE OpenStack Cloud Crowbar: 8 - 9

SUSE Linux Enterprise Server for SAP: 12-SP3 - 12-SP4

HPE Helion Openstack: 8

SUSE Linux Enterprise Server: 12-SP2-BCL - 12-SP4-LTSS

SUSE OpenStack Cloud: 8 - 9

avahi-lang: before 0.6.32-32.15.1

libdns_sd-debuginfo-32bit: before 0.6.32-32.15.1

libdns_sd-32bit: before 0.6.32-32.15.1

libavahi-glib1-debuginfo-32bit: before 0.6.32-32.15.1

libavahi-glib1-32bit: before 0.6.32-32.15.1

libavahi-common3-debuginfo-32bit: before 0.6.32-32.15.1

libavahi-common3-32bit: before 0.6.32-32.15.1

libavahi-client3-debuginfo-32bit: before 0.6.32-32.15.1

libavahi-client3-32bit: before 0.6.32-32.15.1

avahi-debuginfo-32bit: before 0.6.32-32.15.1

libdns_sd-debuginfo: before 0.6.32-32.15.1

libdns_sd: before 0.6.32-32.15.1

libavahi-glib1-debuginfo: before 0.6.32-32.15.1

libavahi-glib1: before 0.6.32-32.15.1

libavahi-core7-debuginfo: before 0.6.32-32.15.1

libavahi-core7: before 0.6.32-32.15.1

libavahi-common3-debuginfo: before 0.6.32-32.15.1

libavahi-common3: before 0.6.32-32.15.1

libavahi-client3-debuginfo: before 0.6.32-32.15.1

libavahi-client3: before 0.6.32-32.15.1

avahi-utils-debuginfo: before 0.6.32-32.15.1

avahi-utils: before 0.6.32-32.15.1

avahi: before 0.6.32-32.15.1

avahi-debugsource: before 0.6.32-32.15.1

avahi-debuginfo: before 0.6.32-32.15.1

avahi-glib2-debugsource: before 0.6.32-32.15.1

CPE2.3

• cpe:2.3:o:suse:suse_openstack_cloud_crowbar:8:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_openstack_cloud_crowbar:9:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap:12-SP3:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap:12-SP4:*:*:*:*:*:*:*
• cpe:2.3:o:suse:hpe_helion_openstack:8:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12-SP2-BCL:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12-SP3-BCL:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:12-SP3-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_openstack_cloud:8:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_openstack_cloud:9:*:*:*:*:*:*:*
• cpe:2.3:a:suse:avahi-lang:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libdns_sd-debuginfo-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libdns_sd-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-glib1-debuginfo-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-glib1-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-common3-debuginfo-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-common3-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-client3-debuginfo-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-client3-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-debuginfo-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libdns_sd-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libdns_sd:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-glib1-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-glib1:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-core7-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-core7:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-common3-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-common3:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-client3-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-client3:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-utils-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-utils:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-glib2-debugsource:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20211494-2/

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.