diff options
Diffstat (limited to 'main/dnsmasq/CVE-2017-14495.patch')
-rw-r--r-- | main/dnsmasq/CVE-2017-14495.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/main/dnsmasq/CVE-2017-14495.patch b/main/dnsmasq/CVE-2017-14495.patch new file mode 100644 index 00000000000..7aad2b3de8a --- /dev/null +++ b/main/dnsmasq/CVE-2017-14495.patch @@ -0,0 +1,41 @@ +From 51eadb692a5123b9838e5a68ecace3ac579a3a45 Mon Sep 17 00:00:00 2001 +From: Simon Kelley <simon@thekelleys.org.uk> +Date: Mon, 25 Sep 2017 20:16:50 +0100 +Subject: [PATCH] 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 + |