Description
Dnsmasq before 2.63test1, when used with certain libvirt configurations, replies to requests from prohibited interfaces, which allows remote attackers to cause a denial of service (traffic amplification) via a spoofed DNS query.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | dnsmasq | 2.63-1 | — |
| Debian 13 | dnsmasq | 2.63-1 | — |
| Debian 12 | dnsmasq | 2.63-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | dnsmasq +1 | 2.48-13.el6 | RHSA-2013:0277 |
| RHEL 6 | libvirt +4 | 0.10.2-18.el6 | RHSA-2013:0276 |
| RHEL 6 | rhev-hypervisor6 | 6.4-20130221.0.el6 | RHSA-2013:0579 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Gluster Storage 3 | libvirt-lock-sanlock | 0.10.2-18.el6 | RHSA-2013:0276 |
Advisories 3
- RHSA-2013:0579 Red Hat Security Advisory: rhev-hypervisor6 security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2013:0277 Red Hat Security Advisory: dnsmasq security, bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2013:0276 Red Hat Security Advisory: libvirt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 28, 2026
References
- MDVSA-2013:072 vendor-advisory
- RHSA-2013:0276 vendor-advisory
- [oss-security] 20120712 Re: Re: CVE Request -- dnsmasq: When being run by libvirt open DNS proxy (reachable out-of the virtual network set for the particular guest domain too) is created mailing-list
- http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commitdiff%3Bh=2f38141f434e23292f84cefc33e8de76fb856147
- https://bugzilla.redhat.com/show_bug.cgi?id=833033
- RHSA-2013:0579 vendor-advisory
- http://www.thekelleys.org.uk/dnsmasq/CHANGELOG
- 54353 vdb-entry
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683372
- RHSA-2013:0277 vendor-advisory
- http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commitdiff%3Bh=54dd393f3938fc0c19088fbd319b95e37d81a2b0