parsedate: handle cut off numbers better

... and don't read outside of the given buffer!

CVE-2016-8621

bug: https://curl.haxx.se/docs/adv_20161102G.html
Reported-by: Luật Nguyễn

diff --git a/lib/parsedate.c b/lib/parsedate.c
index dfcf855c8077ec0c043c352b4c36058394895408..8e932f4cdec05f476a7caeb2357b5930d9438f0a 100644 (file)
--- a/lib/parsedate.c
+++ b/lib/parsedate.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -386,15 +386,17 @@ static int parsedate(const char *date, time_t *output)
       /* a digit */
       int val;
       char *end;
+      int len=0;
       if((secnum == -1) &&
-         (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) {
+         (3 == sscanf(date, "%02d:%02d:%02d%n",
+                      &hournum, &minnum, &secnum, &len))) {
         /* time stamp! */
-        date += 8;
+        date += len;
       }
       else if((secnum == -1) &&
-              (2 == sscanf(date, "%02d:%02d", &hournum, &minnum))) {
+              (2 == sscanf(date, "%02d:%02d%n", &hournum, &minnum, &len))) {
         /* time stamp without seconds */
-        date += 5;
+        date += len;
         secnum = 0;
       }
       else {

diff --git a/tests/data/test517 b/tests/data/test517
index c81a45e0a832966143e254fc7c686fc8cd01650f..513634f15df7b4f9cf0ba814a5bd66087886d9df 100644 (file)
--- a/tests/data/test517
+++ b/tests/data/test517
@@ -116,6 +116,12 @@ nothing
 81: 20111323 12:34:56 => -1
 82: 20110623 12:34:79 => -1
 83: Wed, 31 Dec 2008 23:59:60 GMT => 1230768000
+84: 20110623 12:3 => 1308830580
+85: 20110623 1:3 => 1308790980
+86: 20110623 1:30 => 1308792600
+87: 20110623 12:12:3 => 1308831123
+88: 20110623 01:12:3 => 1308791523
+89: 20110623 01:99:30 => -1
 </stdout>
 
 # This test case previously tested an overflow case ("2094 Nov 6 =>

diff --git a/tests/libtest/lib517.c b/tests/libtest/lib517.c
index 2f68ebd24bd987371d617c6ca4e3a7f14ae3cc2e..22162ff1e300c15908f7e2d6b3072251e733f57f 100644 (file)
--- a/tests/libtest/lib517.c
+++ b/tests/libtest/lib517.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -116,6 +116,12 @@ static const char * const dates[]={
   "20111323 12:34:56",
   "20110623 12:34:79",
   "Wed, 31 Dec 2008 23:59:60 GMT", /* leap second */
+  "20110623 12:3",
+  "20110623 1:3",
+  "20110623 1:30",
+  "20110623 12:12:3",
+  "20110623 01:12:3",
+  "20110623 01:99:30",
   NULL
 };