Buffer overflow in Dnsmasq

1) Out-of-bounds read

EUVDB-ID: #VU19919

Risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-14513

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a boundary error when processing DNS packets. The vulnerability allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet.

Successful exploitation of this vulnerability may result in sensitive data disclosure or denial of service conditions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Dnsmasq: 2.0 - 2.75

External links

http://github.com/Slovejoy/dnsmasq-pre2.76

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.