Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

Appearance settings

[Security] Fix division by zero #46309

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
May 11, 2022
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
3 changes: 3 additions & 0 deletions 3 src/Symfony/Component/Security/Csrf/CsrfTokenManager.php
Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,9 @@ private function derandomize(string $value): string
return $value;
}
$key = base64_decode(strtr($parts[1], '-_', '+/'));
if ('' === $key || false === $key) {
return $value;
}
$value = base64_decode(strtr($parts[2], '-_', '+/'));

return $this->xor($value, $key);
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -193,6 +193,26 @@ public function testNonExistingTokenIsNotValid($namespace, $manager, $storage)
$this->assertFalse($manager->isTokenValid(new CsrfToken('token_id', 'FOOBAR')));
}

public function testTokenShouldNotTriggerDivisionByZero()
{
[$generator, $storage] = $this->getGeneratorAndStorage();
$manager = new CsrfTokenManager($generator, $storage);

// Scenario: the token that was returned is abc.def.ghi, and gets modified in the browser to abc..ghi

$storage->expects($this->once())
->method('hasToken')
->with('https-token_id')
->willReturn(true);

$storage->expects($this->once())
->method('getToken')
->with('https-token_id')
->willReturn('def');

$this->assertFalse($manager->isTokenValid(new CsrfToken('token_id', 'abc..ghi')));
}

/**
* @dataProvider getManagerGeneratorAndStorage
*/
Expand Down
Morty Proxy This is a proxified and sanitized view of the page, visit original site.