#VU32274 Input validation error in Dnsmasq - CVE-2015-8899

Vulnerability identifier: #VU32274

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-8899

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Dnsmasq
Server applications / DNS servers

Vendor: GNU

Description

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

Dnsmasq before 2.76 allows remote servers to cause a denial of service (crash) via a reply with an empty DNS address that has an (1) A or (2) AAAA record defined locally.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Dnsmasq: 2.0 - 2.75

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External links
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2016q2/010479.html
https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2016q2/010505.html
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=41a8d9e99be9f2cc8b02051dd322cb45e0faac87
https://www.openwall.com/lists/oss-security/2016/06/03/7
https://www.openwall.com/lists/oss-security/2016/06/04/2
https://www.securityfocus.com/bid/91031
https://www.securitytracker.com/id/1036045
https://www.ubuntu.com/usn/USN-3009-1

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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.