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parsedate: handle cut off numbers better

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... 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
This commit is contained in:
Daniel Stenberg 2016-10-04 16:59:38 +02:00
parent 46133aa536
commit 96a80b5a26
3 changed files with 20 additions and 6 deletions
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12
lib/parsedate.c
View File

@ -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 {

6
tests/data/test517
View File

@ -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 =>

8
tests/libtest/lib517.c
View File

@ -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
};