bug#47674: dnsmasq is vulnerable to CVE-2021-3448

["Nicolò Balzarotti" <anothersms@gmail.com>]

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CVE-2021-3448

A flaw was found in dnsmasq in versions before 2.85. When configured to
use a specific server for a given network interface, dnsmasq uses a
fixed port while forwarding queries. An attacker on the network, able to
find the outgoing port used by dnsmasq, only needs to guess the random
transmission ID to forge a reply and get it accepted by dnsmasq. This
flaw makes a DNS Cache Poisoning attack much easier. The highest threat
from this vulnerability is to data integrity.

guix ships dnsmasq@2.84. guix refresh shows version 2.85 is available,
and there are 43 dependent packages so this can go directly to master.

All dependent packages (refresh -l) build fine except for
python2-libvirt@7.2.0, which is failing also on master
(libvirt-python requires Python >= 3.5 to build).  Since it's a python2
package and no other packages depends on it, can we just drop it?

Thanks, Nicolò


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From a0932442c6c72d1e1a2a0f400f8afa487251189d Mon Sep 17 00:00:00 2001
From: nixo <nicolo@nixo.xyz>
Date: Fri, 9 Apr 2021 16:19:03 +0200
Subject: [PATCH] gnu: dnsmasq: Update to 2.85.

* gnu/packages/dns.scm (dnsmasq): Update to 2.85.
---
 gnu/packages/dns.scm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/dns.scm b/gnu/packages/dns.scm
index c940657ce9..3cf88febae 100644
--- a/gnu/packages/dns.scm
+++ b/gnu/packages/dns.scm
@@ -278,7 +278,7 @@ prompt the user with the option to go with insecure DNS only.")
 (define-public dnsmasq
   (package
     (name "dnsmasq")
-    (version "2.84")
+    (version "2.85")
     (source (origin
               (method url-fetch)
               (uri (string-append
@@ -286,7 +286,7 @@ prompt the user with the option to go with insecure DNS only.")
                     version ".tar.xz"))
               (sha256
                (base32
-                "0305a0c3snwqcv77sipyynr55xip1fp2843yn04pc4vk9g39acb0"))))
+                "1yhjwgz8g5qrqvxh6bbmg3443zi8qqjks3q872wyb1zn7n0d765d"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)))
-- 
2.31.1