#VU83306 Reachable Assertion in Avahi - CVE-2021-3502

Vulnerability identifier: #VU83306

Vulnerability 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-2021-3502

CWE-ID: CWE-617

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Avahi
Universal components / Libraries / Libraries used by multiple products

Vendor: avahi.org

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_s_host_name_resolver_start function. A local user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Avahi: 0.1 - 0.8

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External links
http://github.com/lathiat/avahi/issues/338
http://bugzilla.redhat.com/show_bug.cgi?id=1946914

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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.