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[CVE-2023-22729] Escaped double slash is absolute URL
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@GuySartorelli
GuySartorelli committed Apr 25, 2023
1 parent 92061a3 commit 1a5bb4c
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Showing 2 changed files with 45 additions and 10 deletions.
5 changes: 3 additions & 2 deletions src/Control/Director.php
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Original file line number Diff line number Diff line change
Expand Up @@ -822,10 +822,11 @@ public static function is_absolute_url($url)
return (
// Base check for existence of a host on a compliant URL
parse_url($url ?? '', PHP_URL_HOST)
// Check for more than one leading slash without a protocol.
// Check for more than one leading slash (forward or backward) without a protocol.
// While not a RFC compliant absolute URL, it is completed to a valid URL by some browsers,
// and hence a potential security risk. Single leading slashes are not an issue though.
|| preg_match('%^\s*/{2,}%', $url ?? '')
// Note: Need 4 backslashes to have a single non-escaped backslash for regex.
|| preg_match('%^\s*(\\\\|/){2,}%', $url ?? '')
|| (
// If a colon is found, check if it's part of a valid scheme definition
// (meaning its not preceded by a slash).
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50 changes: 42 additions & 8 deletions tests/php/Control/DirectorTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -232,6 +232,9 @@ public function provideAbsolutePaths()
public function testIsAbsoluteUrl()
{
$this->assertTrue(Director::is_absolute_url('http://test.com/testpage'));
$this->assertTrue(Director::is_absolute_url('https:/\\test.com'));
$this->assertTrue(Director::is_absolute_url('https:\\/test.com'));
$this->assertTrue(Director::is_absolute_url('https:\\\\test.com'));
$this->assertTrue(Director::is_absolute_url('ftp://test.com'));
$this->assertFalse(Director::is_absolute_url('test.com/testpage'));
$this->assertFalse(Director::is_absolute_url('/relative'));
Expand All @@ -241,6 +244,11 @@ public function testIsAbsoluteUrl()
$this->assertTrue(Director::is_absolute_url("https://test.com/?url=http://foo.com"));
$this->assertTrue(Director::is_absolute_url("trickparseurl:http://test.com"));
$this->assertTrue(Director::is_absolute_url('//test.com'));
$this->assertTrue(Director::is_absolute_url('\\/\\/test.com'));
$this->assertTrue(Director::is_absolute_url('\/\/test.com'));
$this->assertTrue(Director::is_absolute_url('/\\test.com'));
$this->assertTrue(Director::is_absolute_url('\\\\test.com'));
$this->assertFalse(Director::is_absolute_url('\\test.com'));
$this->assertTrue(Director::is_absolute_url('/////test.com'));
$this->assertTrue(Director::is_absolute_url(' ///test.com'));
$this->assertTrue(Director::is_absolute_url('http:test.com'));
Expand All @@ -258,8 +266,17 @@ public function testIsRelativeUrl()
{
$this->assertFalse(Director::is_relative_url('http://test.com'));
$this->assertFalse(Director::is_relative_url('https://test.com'));
$this->assertFalse(Director::is_relative_url('https:/\\test.com'));
$this->assertFalse(Director::is_relative_url('https:\\/test.com'));
$this->assertFalse(Director::is_relative_url('https:\\\\test.com'));
$this->assertFalse(Director::is_relative_url(' https://test.com/testpage '));
$this->assertTrue(Director::is_relative_url('test.com/testpage'));
$this->assertFalse(Director::is_relative_url('//test.com'));
$this->assertFalse(Director::is_relative_url('\\/\\/test.com'));
$this->assertFalse(Director::is_relative_url('\/\/test.com'));
$this->assertFalse(Director::is_relative_url('/\\test.com'));
$this->assertFalse(Director::is_relative_url('\\\\test.com'));
$this->assertTrue(Director::is_relative_url('\\test.com'));
$this->assertFalse(Director::is_relative_url('ftp://test.com'));
$this->assertTrue(Director::is_relative_url('/relative'));
$this->assertTrue(Director::is_relative_url('relative'));
Expand Down Expand Up @@ -401,17 +418,34 @@ public function testMakeRelative($baseURL, $requestURL, $relativeURL)
);
}

/**
* Mostly tested by {@link testIsRelativeUrl()},
* just adding the host name matching aspect here.
*/
public function testIsSiteUrl()
{
$this->assertFalse(Director::is_site_url("http://test.com"));
$this->assertFalse(Director::is_site_url('http://test.com'));
$this->assertTrue(Director::is_site_url('/relative-path'));
$this->assertTrue(Director::is_site_url('relative-path'));
$this->assertTrue(Director::is_site_url(Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url("http://test.com?url=" . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url("http://test.com?url=" . urlencode(Director::absoluteBaseURL() ?? '')));
$this->assertFalse(Director::is_site_url("//test.com?url=" . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('http://test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('http://test.com?url=' . urlencode(Director::absoluteBaseURL() ?? '')));
$this->assertFalse(Director::is_site_url('http:\\\\test.com'));
$this->assertFalse(Director::is_site_url('http:\\\\test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('http:\\\\test.com?url=' . urlencode(Director::absoluteBaseURL() ?? '')));
$this->assertFalse(Director::is_site_url('http:\\/test.com'));
$this->assertFalse(Director::is_site_url('http:\\/test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('http:\\/test.com?url=' . urlencode(Director::absoluteBaseURL() ?? '')));
$this->assertFalse(Director::is_site_url('//test.com'));
$this->assertFalse(Director::is_site_url('//test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('\\/\\/test.com'));
$this->assertFalse(Director::is_site_url('\\/\\/test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('\/\/test.com'));
$this->assertFalse(Director::is_site_url('\/\/test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('\\/test.com'));
$this->assertFalse(Director::is_site_url('\\/test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('/\\test.com'));
$this->assertFalse(Director::is_site_url('/\\test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('\\\\test.com'));
$this->assertFalse(Director::is_site_url('\\\\test.com?url=' . Director::absoluteBaseURL()));
$this->assertTrue(Director::is_site_url('\\test.com'));
$this->assertTrue(Director::is_site_url('\\test.com?url=' . Director::absoluteBaseURL()));
$this->assertFalse(Director::is_site_url('http://google.com\@test.com'));
$this->assertFalse(Director::is_site_url('http://google.com/@test.com'));
$this->assertFalse(Director::is_site_url('http://google.com:pass\@test.com'));
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