curl: fix for CVE-2018-1000005

HTTP/2 trailer out-of-bounds read
An out-of-bounds read in code handling HTTP/2 trailers was found.
This could lead to a denial-of-service or an information disclosure
in some circumstances.

Affected versions: libcurl 7.49.0 to and including 7.57.0

Upstream patch:
https://github.com/curl/curl/commit/fa3dbb9a147488a294.patch

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Adrian Dudau <adrian.dudau@enea.com>

2 files changed, 40 insertions, 0 deletions

diff --git a/recipes-support/curl/curl/CVE-2018-1000005.patch b/recipes-support/curl/curl/CVE-2018-1000005.patch
new file mode 100644
index 0000000..2b864a1
--- /dev/null
+++ b/recipes-support/curl/curl/CVE-2018-1000005.patch
@@ -0,0 +1,39 @@
+From fa3dbb9a147488a2943bda809c66fc497efe06cb Mon Sep 17 00:00:00 2001
+From: Zhouyihai Ding <ddyihai@ddyihai.svl.corp.google.com>
+Date: Wed, 10 Jan 2018 10:12:18 -0800
+Subject: [PATCH] http2: fix incorrect trailer buffer size
+
+Prior to this change the stored byte count of each trailer was
+miscalculated and 1 less than required. It appears any trailer
+after the first that was passed to Curl_client_write would be truncated
+or corrupted as well as the size. Potentially the size of some
+subsequent trailer could be erroneously extracted from the contents of
+that trailer, and since that size is used by client write an
+out-of-bounds read could occur and cause a crash or be otherwise
+processed by client write.
+
+The bug appears to have been born in 0761a51 (precedes 7.49.0).
+
+Closes https://github.com/curl/curl/pull/2231
+
+CVE: CVE-2018-1000005
+Upstream-Status: Backport
+---
+ lib/http2.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/lib/http2.c b/lib/http2.c
+index 8e2fc71996..699287940e 100644
+--- a/lib/http2.c
++++ b/lib/http2.c
+@@ -925,8 +925,8 @@ static int on_header(nghttp2_session *session, const nghttp2_frame *frame,
+ 
+   if(stream->bodystarted) {
+     /* This is trailer fields. */
+-    /* 3 is for ":" and "\r\n". */
+-    uint32_t n = (uint32_t)(namelen + valuelen + 3);
++    /* 4 is for ": " and "\r\n". */
++    uint32_t n = (uint32_t)(namelen + valuelen + 4);
+ 
+     DEBUGF(infof(data_s, "h2 trailer: %.*s: %.*s\n", namelen, name, valuelen,
+                  value));
diff --git a/recipes-support/curl/curl_%.bbappend b/recipes-support/curl/curl_%.bbappend
index 5e642bb..3727bea 100644
--- a/recipes-support/curl/curl_%.bbappend
+++ b/recipes-support/curl/curl_%.bbappend
@@ -8,4 +8,5 @@ SRC_URI += "file://CVE-2017-7407.patch \
             file://CVE-2017-1000257.patch \
             file://CVE-2017-8816.patch \
             file://CVE-2017-8817.patch \
+            file://CVE-2018-1000005.patch \
            "