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vulnerability CVE-2013-0198

Dnsmasq: listening on all interfaces via libvirt and TCP

Synthesis of the vulnerability

When Dnsmasq is installed on a server using libvirt, Dnsmasq accepts TCP queries coming from all interfaces, so an attacker can for example create a distributed denial of service.
Impacted products: Dnsmasq, Fedora, MBS.
Severity: 1/4.
Creation date: 18/01/2013.
Identifiers: 894486, BID-57458, CVE-2013-0198, FEDORA-2013-1320, FEDORA-2013-1357, MDVSA-2013:072, VIGILANCE-VUL-12340.

Description of the vulnerability

The VIGILANCE-VUL-11750 bulletin describes a vulnerability of Dnsmasq with libvirt, which accepts queries coming from all interfaces.

This vulnerability was corrected (VIGILANCE-SOL-26802) for DNS packets on UDP. However, an attacker can still use DNS packets on TCP.

When Dnsmasq is installed on a server using libvirt, Dnsmasq therefore accepts TCP queries coming from all interfaces, so an attacker can for example create a distributed denial of service.
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Vigil@nce provides software vulnerability announces. The Vigil@nce vulnerability database contains several thousand vulnerabilities. The Vigil@nce security watch publishes vulnerability bulletins about threats impacting the information system. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.