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 Manager Proxy: 4.0

SUSE Manager Retail Branch Server: 4.0

SUSE Manager Server: 4.0

SUSE Linux Enterprise Server for SAP: 15-SP1

SUSE Linux Enterprise High Performance Computing: 15-SP1-LTSS - 15-SP1-ESPOS

SUSE Enterprise Storage: 6

SUSE CaaS Platform: 4.0

SUSE Linux Enterprise Server: 15-SP1-BCL - 15-SP1-LTSS

avahi-lang: before 0.7-3.9.1

libavahi-common3-32bit-debuginfo: before 0.7-3.9.1

libavahi-common3-32bit: before 0.7-3.9.1

libavahi-client3-32bit-debuginfo: before 0.7-3.9.1

libavahi-client3-32bit: before 0.7-3.9.1

avahi-32bit-debuginfo: before 0.7-3.9.1

typelib-1_0-Avahi-0_6: before 0.7-3.9.1

libhowl0-debuginfo: before 0.7-3.9.1

libhowl0: before 0.7-3.9.1

libdns_sd-debuginfo: before 0.7-3.9.1

libdns_sd: before 0.7-3.9.1

libavahi-ui0-debuginfo: before 0.7-3.9.1

libavahi-ui0: before 0.7-3.9.1

libavahi-ui-gtk3-0-debuginfo: before 0.7-3.9.1

libavahi-ui-gtk3-0: before 0.7-3.9.1

libavahi-gobject0-debuginfo: before 0.7-3.9.1

libavahi-gobject0: before 0.7-3.9.1

libavahi-glib1-debuginfo: before 0.7-3.9.1

libavahi-glib1: before 0.7-3.9.1

libavahi-glib-devel: before 0.7-3.9.1

libavahi-devel: before 0.7-3.9.1

libavahi-core7-debuginfo: before 0.7-3.9.1

libavahi-core7: before 0.7-3.9.1

libavahi-common3-debuginfo: before 0.7-3.9.1

libavahi-common3: before 0.7-3.9.1

libavahi-client3-debuginfo: before 0.7-3.9.1

libavahi-client3: before 0.7-3.9.1

avahi-utils-debuginfo: before 0.7-3.9.1

avahi-utils: before 0.7-3.9.1

avahi-compat-mDNSResponder-devel: before 0.7-3.9.1

avahi-compat-howl-devel: before 0.7-3.9.1

avahi: before 0.7-3.9.1

libavahi-gobject-devel: before 0.7-3.9.1

avahi-utils-gtk-debuginfo: before 0.7-3.9.1

avahi-utils-gtk: before 0.7-3.9.1

avahi-glib2-debugsource: before 0.7-3.9.1

avahi-autoipd-debuginfo: before 0.7-3.9.1

avahi-autoipd: before 0.7-3.9.1

avahi-debugsource: before 0.7-3.9.1

avahi-debuginfo: before 0.7-3.9.1

CPE2.3

• cpe:2.3:o:suse:suse_manager_proxy:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_manager_retail_branch_server:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_manager_server:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server_for_sap:15-SP1:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing:15-SP1-LTSS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_high_performance_computing:15-SP1-ESPOS:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_enterprise_storage:6:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_caas_platform:4.0:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:15-SP1-BCL:*:*:*:*:*:*:*
• cpe:2.3:o:suse:suse_linux_enterprise_server:15-SP1-LTSS:*:*:*:*:*:*:*
• cpe:2.3:a:suse:avahi-lang:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-common3-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-common3-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-client3-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-client3-32bit:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-32bit-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:typelib-1_0-avahi-0_6:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libhowl0-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libhowl0:*:*:*:*:*: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-ui0-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-ui0:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-ui-gtk3-0-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-ui-gtk3-0:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-gobject0-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-gobject0:*:*:*:*:*: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-glib-devel:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-devel:*:*:*:*:*: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-compat-mdnsresponder-devel:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-compat-howl-devel:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:libavahi-gobject-devel:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-utils-gtk-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-utils-gtk:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-glib2-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-autoipd-debuginfo:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-autoipd:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-debugsource:*:*:*:*:*:suse_linux:*:*
• cpe:2.3:a:suse:avahi-debuginfo:*:*:*:*:*:suse_linux:*:*

External links

https://www.suse.com/support/update/announcement/2021/suse-su-20211493-2/

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.