Amazon Linux AMI update for avahi

1) Reachable Assertion

EUVDB-ID: #VU83304

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-38473

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due to a reachable assertion within the avahi_alternative_host_name() function. A local user can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Update the affected packages:

aarch64:
    avahi-dnsconfd-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-gobject-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-debugsource-0.8-14.amzn2023.0.12.aarch64
    avahi-tools-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-glib-devel-0.8-14.amzn2023.0.12.aarch64
    avahi-compat-howl-0.8-14.amzn2023.0.12.aarch64
    avahi-compat-howl-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-compat-libdns_sd-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-devel-0.8-14.amzn2023.0.12.aarch64
    avahi-gobject-devel-0.8-14.amzn2023.0.12.aarch64
    avahi-libs-0.8-14.amzn2023.0.12.aarch64
    avahi-compat-howl-devel-0.8-14.amzn2023.0.12.aarch64
    avahi-dnsconfd-0.8-14.amzn2023.0.12.aarch64
    avahi-ui-devel-0.8-14.amzn2023.0.12.aarch64
    avahi-gobject-0.8-14.amzn2023.0.12.aarch64
    avahi-compat-libdns_sd-devel-0.8-14.amzn2023.0.12.aarch64
    avahi-glib-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-autoipd-0.8-14.amzn2023.0.12.aarch64
    avahi-compat-libdns_sd-0.8-14.amzn2023.0.12.aarch64
    avahi-autoipd-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-glib-0.8-14.amzn2023.0.12.aarch64
    avahi-ui-gtk3-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-0.8-14.amzn2023.0.12.aarch64
    avahi-ui-gtk3-0.8-14.amzn2023.0.12.aarch64
    avahi-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-libs-debuginfo-0.8-14.amzn2023.0.12.aarch64
    avahi-tools-0.8-14.amzn2023.0.12.aarch64

src:
    avahi-0.8-14.amzn2023.0.12.src

x86_64:
    avahi-gobject-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-compat-howl-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-libs-0.8-14.amzn2023.0.12.x86_64
    avahi-debugsource-0.8-14.amzn2023.0.12.x86_64
    avahi-ui-devel-0.8-14.amzn2023.0.12.x86_64
    avahi-glib-0.8-14.amzn2023.0.12.x86_64
    avahi-dnsconfd-0.8-14.amzn2023.0.12.x86_64
    avahi-gobject-devel-0.8-14.amzn2023.0.12.x86_64
    avahi-dnsconfd-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-devel-0.8-14.amzn2023.0.12.x86_64
    avahi-tools-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-libs-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-compat-howl-0.8-14.amzn2023.0.12.x86_64
    avahi-ui-gtk3-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-autoipd-0.8-14.amzn2023.0.12.x86_64
    avahi-compat-libdns_sd-devel-0.8-14.amzn2023.0.12.x86_64
    avahi-tools-0.8-14.amzn2023.0.12.x86_64
    avahi-gobject-0.8-14.amzn2023.0.12.x86_64
    avahi-glib-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-compat-howl-devel-0.8-14.amzn2023.0.12.x86_64
    avahi-glib-devel-0.8-14.amzn2023.0.12.x86_64
    avahi-compat-libdns_sd-0.8-14.amzn2023.0.12.x86_64
    avahi-compat-libdns_sd-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-autoipd-debuginfo-0.8-14.amzn2023.0.12.x86_64
    avahi-0.8-14.amzn2023.0.12.x86_64
    avahi-ui-gtk3-0.8-14.amzn2023.0.12.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

avahi: All versions

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*
• cpe:2.3:a:amazon_web_services:avahi:*:*:*:*:*:amazon_linux_ami:*:*

External links

https://alas.aws.amazon.com/AL2023/ALAS-2023-455.html

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.