#VU26336 Unchecked Return Value in libmicrodns - CVE-2020-6072

Vulnerability identifier: #VU26336

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-6072

CWE-ID: CWE-252

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libmicrodns
Web applications / JS libraries

Vendor: Videolabs

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists within the label-parsing functionality due to the "rr_decode" function's return value is not checked when parsing compressed labels in mDNS messages. A remote attacker can send a specially crafted mDNS message and execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libmicrodns: 0.1.0

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External links
https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-0995

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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