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Valinor error messages leading to potential data exfiltration before v0.12.0

High severity GitHub Reviewed Published Jul 10, 2022 in CuyZ/Valinor • Updated Jan 27, 2023

Package

composer cuyz/valinor (Composer)

Affected versions

< 0.12.0

Patched versions

0.12.0

Description

<?php

namespace My\App;

use CuyZ\Valinor\Mapper\MappingError;
use CuyZ\Valinor\Mapper\Tree\Node;
use CuyZ\Valinor\Mapper\Tree\NodeTraverser;
use CuyZ\Valinor\MapperBuilder;

require_once __DIR__ . '/Valinor/vendor/autoload.php';

final class Money
{
    private function __construct(public readonly string $amount)
    {
    }

    public static function fromString(string $money): self
    {
        if (1 !== \preg_match('/^\d+ [A-Z]{3}$/', $money)) {
            throw new \InvalidArgumentException(\sprintf('Given "%s" is not a recognized monetary amount', $money));
        }
        
        return new self($money);
    }
}

class Foo
{
    public function __construct(
        private readonly Money $a,
        private readonly Money $b,
        private readonly Money $c,
    ) {}
}

$mapper = (new MapperBuilder())
    ->registerConstructor([Money::class, 'fromString'])
    ->mapper();

try {
    var_dump($mapper->map(Foo::class, [
        'a' => 'HAHA',
        'b' => '100 EUR',
        'c' => 'USD 100'
    ]));
} catch (MappingError $e) {
    $messages = (new NodeTraverser(function (Node $node) {
        foreach ($node->messages() as $message) {
            var_dump([
                '$message',
                $message->path(),
                $message->body()
            ]);
        }
        return '';
    }))->traverse($e->node());

    iterator_to_array($messages);
}

Now, this is quite innocent: it produces following output:

❯ php value-object-conversion.php
array(3) {
  [0]=>
  string(8) "$message"
  [1]=>
  string(1) "a"
  [2]=>
  string(48) "Given "HAHA" is not a recognized monetary amount"
}
array(3) {
  [0]=>
  string(8) "$message"
  [1]=>
  string(1) "c"
  [2]=>
  string(51) "Given "USD 100" is not a recognized monetary amount"
}

The problem is that nowhere I told valinor that it could use Throwable#getMessage().

This is a problem with cases where you get:

  • an SQL exception showing an SQL snippet
  • a DB connection exception showing DB ip address/username/password
  • a timeout detail / out of memory detail (exploring DDoS possibilities)

This allows for potential data exfiltration, DDoS, enumeration attacks, etc.

References

@romm romm published to CuyZ/Valinor Jul 10, 2022
Published by the National Vulnerability Database Jul 11, 2022
Published to the GitHub Advisory Database Jul 12, 2022
Reviewed Jul 12, 2022
Last updated Jan 27, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.203%
(59th percentile)

CVE ID

CVE-2022-31140

GHSA ID

GHSA-5pgm-3j3g-2rc7

Source code

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