Gentoo: GLSA-202105-20: Dnsmasq: DNS cache poisoning

Advisories

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 202105-20
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Low
     Title: Dnsmasq: DNS cache poisoning
      Date: May 26, 2021
      Bugs: #782130
        ID: 202105-20

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

Use of insufficient randomness in Dnsmasq might lead to DNS Cache
Poisoning.

Background
==========

Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP
server.

Affected packages
=================

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-dns/dnsmasq               < 2.85                     >= 2.85

Description
===========

It was discovered that Dnsmasq, when configured with
--server=
@ or similar (e.g. through dbus), configured a fixed UDP port for all outgoing queries to the specified upstream DNS server. Impact ====== An attacker, by sending malicious crafted DNS responses, could perform a DNS Cache Poisoning attack. Workaround ========== There is no known workaround at this time. Resolution ========== All Dnsmasq users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.85" References ========== [ 1 ] CVE-2021-3448 https://nvd.nist.gov/vuln/detail/CVE-2021-3448 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202105-20 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to [email protected] or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2021 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5

Gentoo: GLSA-202105-20: Dnsmasq: DNS cache poisoning

Summary

It was discovered that Dnsmasq, when configured with --server=

@ or similar (e.g. through dbus), configured a fixed UDP port for all outgoing queries to the specified upstream DNS server.

Resolution

All Dnsmasq users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.85"

References

[ 1 ] CVE-2021-3448 https://nvd.nist.gov/vuln/detail/CVE-2021-3448

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
https://security.gentoo.org/glsa/202105-20

Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to [email protected] or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity
Severity: Low
Title: Dnsmasq: DNS cache poisoning
Issued Date: May 26, 2021
Bugs: #782130
ID: 202105-20

Synopsis

Use of insufficient randomness in Dnsmasq might lead to DNS Cache Poisoning.

Background

Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP server.

Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/dnsmasq < 2.85 >= 2.85

Impact

An attacker, by sending malicious crafted DNS responses, could perform a DNS Cache Poisoning attack.

Workaround

There is no known workaround at this time.

We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.