pemensik pushed to dnsmasq (f27). "Security fix, CVE-2017-14495, OOM in DNS response (..more)"

From ce9aecdce07054e92b72e106ec3075a8cb16144b Mon Sep 17 00:00:00 2001
From: Petr Menšík 
Date: Oct 02 2017 15:08:22 +0000
Subject: Security fix, CVE-2017-14495, OOM in DNS response

creation.

Fix out-of-memory Dos vulnerability. An attacker which can
    send malicious DNS queries to dnsmasq can trigger memory
    allocations in the add_pseudoheader function
    The allocated memory is never freed which leads to a DoS
    through memory exhaustion. dnsmasq is vulnerable only
    if one of the following option is specified:
    --add-mac, --add-cpe-id or --add-subnet.

Signed-off-by: Petr Menšík

---

diff --git a/dnsmasq-2.77-CVE-2017-14495.patch b/dnsmasq-2.77-CVE-2017-14495.patch
new file mode 100644
index 0000000..0f793aa
--- /dev/null
+++ b/dnsmasq-2.77-CVE-2017-14495.patch
@@ -0,0 +1,41 @@
+From 51eadb692a5123b9838e5a68ecace3ac579a3a45 Mon Sep 17 00:00:00 2001
+From: Simon Kelley 
+Date: Mon, 25 Sep 2017 20:16:50 +0100
+Subject: [PATCH 7/9] Security fix, CVE-2017-14495, OOM in DNS response
+ creation.
+
+Fix out-of-memory Dos vulnerability. An attacker which can
+send malicious DNS queries to dnsmasq can trigger memory
+allocations in the add_pseudoheader function
+The allocated memory is never freed which leads to a DoS
+through memory exhaustion. dnsmasq is vulnerable only
+if one of the following option is specified:
+--add-mac, --add-cpe-id or --add-subnet.
+---
+ src/edns0.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/src/edns0.c b/src/edns0.c
+index 95b74ee..89b2692 100644
+--- a/src/edns0.c
++++ b/src/edns0.c
+@@ -192,9 +192,15 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
+ 	  !(p = skip_section(p, 
+ 			     ntohs(header->ancount) + ntohs(header->nscount) + ntohs(header->arcount), 
+ 			     header, plen)))
++      {
++	free(buff);
+ 	return plen;
++      }
+       if (p + 11 > limit)
+-       return plen; /* Too big */
++      {
++        free(buff);
++        return plen; /* Too big */
++      }
+       *p++ = 0; /* empty name */
+       PUTSHORT(T_OPT, p);
+       PUTSHORT(udp_sz, p); /* max packet length, 512 if not given in EDNS0 header */
+-- 
+2.9.5
+
diff --git a/dnsmasq.spec b/dnsmasq.spec
index 0e99f7b..0a77cff 100644
--- a/dnsmasq.spec
+++ b/dnsmasq.spec
@@ -28,6 +28,7 @@ Patch3:         dnsmasq-2.77-CVE-2017-14492.patch
 Patch4:         dnsmasq-2.77-CVE-2017-14493.patch
 Patch5:         dnsmasq-2.77-CVE-2017-14494.patch
 Patch6:         dnsmasq-2.77-CVE-2017-14496.patch
+Patch7:         dnsmasq-2.77-CVE-2017-14495.patch

BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)

@@ -68,6 +69,7 @@ query/remove a DHCP server's leases.
 %patch4 -p1 -b .CVE-2017-14493
 %patch5 -p1 -b .CVE-2017-14494
 %patch6 -p1 -b .CVE-2017-14496
+%patch7 -p1 -b .CVE-2017-14495

# use /var/lib/dnsmasq instead of /var/lib/misc
 for file in dnsmasq.conf.example man/dnsmasq.8 man/es/dnsmasq.8 src/config.h; do
@@ -160,6 +162,7 @@ rm -rf $RPM_BUILD_ROOT
 - Security fix, CVE-2017-14493, DHCPv6 - Stack buffer overflow
 - Security fix, CVE-2017-14494, Infoleak handling DHCPv6
 - Security fix, CVE-2017-14496, Integer underflow in DNS response creation
+- Security fix, CVE-2017-14495, OOM in DNS response creation

* Thu Sep 14 2017 Petr Menšík  - 2.77-7
 - Fix CVE-2017-13704

https://src.fedoraproject.org/rpms/dnsmasq/c/ce9aecdce07054e92b72e106ec3075a...