- bsc#1209358, CVE-2023-28450, dnsmasq-CVE-2023-28450.patch:

default maximum EDNS.0 UDP packet size should be 1232

OBS-URL: https://build.opensuse.org/package/show/network/dnsmasq?expand=0&rev=159

dnsmasq-CVE-2023-28450.patch

@@ -0,0 +1,54 @@
+From eb92fb32b746f2104b0f370b5b295bb8dd4bd5e5 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Tue, 7 Mar 2023 22:07:46 +0000
+Subject: [PATCH] Set the default maximum DNS UDP packet size to 1232.
+
+http://www.dnsflagday.net/2020/ refers.
+
+Thanks to Xiang Li for the prompt.
+---
+ CHANGELOG     | 9 ++++++++-
+ man/dnsmasq.8 | 3 ++-
+ src/config.h  | 2 +-
+ 3 files changed, 11 insertions(+), 3 deletions(-)
+
+--- CHANGELOG.orig
++++ CHANGELOG
+@@ -11,7 +11,14 @@ version 2.89
+ 	for reporting the bug and for his great efforts in chasing
+ 	it down.
+ 
++	Set the default maximum DNS UDP packet sice to 1232. This
++	has been the recommended value since 2020 because it's the
++	largest value that avoid fragmentation, and fragmentation
++	is just not reliable on the modern internet, especially
++	for IPv6. It's still possible to override this with
++	--edns-packet-max for special circumstances.
+ 
++	
+ version 2.88
+ 	Fix bug in --dynamic-host when an interface has /16 IPv4
+   	address. Thanks to Mark Dietzer for spotting this.
+--- man/dnsmasq.8.orig
++++ man/dnsmasq.8
+@@ -183,7 +183,8 @@ to zero completely disables DNS function
+ .TP
+ .B \-P, --edns-packet-max=<size>
+ Specify the largest EDNS.0 UDP packet which is supported by the DNS
+-forwarder. Defaults to 4096, which is the RFC5625-recommended size.
++forwarder. Defaults to 1232, which is the recommended size following the
++DNS flag day in 2020. Only increase if you know what you are doing.
+ .TP
+ .B \-Q, --query-port=<query_port>
+ Send outbound DNS queries from, and listen for their replies on, the
+--- src/config.h.orig
++++ src/config.h
+@@ -19,7 +19,7 @@
+ #define CHILD_LIFETIME 150 /* secs 'till terminated (RFC1035 suggests > 120s) */
+ #define TCP_MAX_QUERIES 100 /* Maximum number of queries per incoming TCP connection */
+ #define TCP_BACKLOG 32  /* kernel backlog limit for TCP connections */
+-#define EDNS_PKTSZ 4096 /* default max EDNS.0 UDP packet from RFC5625 */
++#define EDNS_PKTSZ 1232 /* default max EDNS.0 UDP packet from from  /dnsflagday.net/2020 */
+ #define SAFE_PKTSZ 1232 /* "go anywhere" UDP packet size, see https://dnsflagday.net/2020/ */
+ #define KEYBLOCK_LEN 40 /* choose to minimise fragmentation when storing DNSSEC keys */
+ #define DNSSEC_WORK 50 /* Max number of queries to validate one question */

dnsmasq-groups.patch

@@ -1,6 +1,6 @@
---- a/src/dnsmasq.c.orig
-+++ b/src/dnsmasq.c
-@@ -581,11 +581,10 @@ int main (int argc, char **argv)
+--- src/dnsmasq.c.orig
++++ src/dnsmasq.c
+@@ -731,11 +731,10 @@ int main (int argc, char **argv)
    if (!option_bool(OPT_DEBUG) && getuid() == 0)   
      {
        int bad_capabilities = 0;

dnsmasq.changes

@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue Apr 25 08:32:41 UTC 2023 - Reinhard Max <max@suse.com>
+
+- bsc#1209358, CVE-2023-28450, dnsmasq-CVE-2023-28450.patch:
+  default maximum EDNS.0 UDP packet size should be 1232
+
 -------------------------------------------------------------------
 Mon Feb  6 09:27:27 UTC 2023 - Paolo Stivanin <info@paolostivanin.com>
 

dnsmasq.spec

@@ -36,6 +36,7 @@ Source4:        dnsmasq.service
 Source5:        rc.dnsmasq-suse
 Source6:        system-user-dnsmasq.conf
 Patch0:         dnsmasq-groups.patch
+Patch1:         dnsmasq-CVE-2023-28450.patch
 BuildRequires:  dbus-1-devel
 BuildRequires:  dos2unix
 BuildRequires:  libidn2-devel
@@ -71,7 +72,7 @@ Utilities that use the standard DHCP protocol to query/remove a DHCP
 server's leases.
 
 %prep
-%autosetup -p1
+%autosetup -p0
 
 # Remove the executable bit from python example files to
 # avoid unwanted automatic dependencies