Denial of service in GNU Dnsmasq



Published: 2022-05-11
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2022-0934
CWE-ID CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Dnsmasq
Server applications / DNS servers

Vendor GNU

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU63013

Risk: Medium

CVSSv3.1: 6.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2022-0934

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when handling DHCPv6 requests. A remote attacker can send specially crafted DHCPv6 packets to the affected application, trigger a use-after-free error and perform a denial of service (DoS) attack.


Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Dnsmasq: 2.0 - 2.86


CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2022-0934
http://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2022q1/016272.html

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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



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